Lg 42 Inch Plasma Tv Training Manual 82f1v
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42 Inch(Wide) PDP SVC Training Manual
LG Electronics / DND QA
Contents Ⅰ. Usage/Service Points to be concerned Ⅱ. Module formation & spec Ⅲ. Screen defect diagnosis 1. 4/7 or 3/7 of screen is not displayed. 2. Screen by Data COF is not displayed. 3. one or more of Data COF IC have regular vertical lines. 4. Data COF IC unit error pattern 5. The screen by Scan COF is not displayed. 6. Regular- interval vertical line in the whole screen. 7. Vertical data copy 8. One or more vertical bars. 9. One or more horizontal bars. 10. Input signal pattern is displayed but the whole brightness of screen is dark. 11. In full white pattern, foreign color is displayed or in full black pattern, misdischarge is partially occurred.. 12. In full white pattern, the brightness is getting darker toward the center. 13. A specific brightness of one color is not clear.
Ⅳ. Non-picture defect diagnosis Ⅴ. One Point Service Guide(42 Inch, 40 Inch)
Ⅰ. Usage/Service points to be concerned Color PDP is a display device consisting of section & Drive section. section is composed of electrode, fluorescent substances ,dielectrics and gases, and drive section is a combination of electrical circuit section and PCB section. We call this concrete as PDP Module Ass’y and the following shows warning. SUGGGESTIONS 1. Static precaution Drive section circuit is C-MOS circuit, so to protect against static electricity, wear static-proof wrist band. 2. Cleaning when wiping , do not use liquid cleaner or other chemicals . Use a damp cloth for cleaning . 3. handling Color PDP uses high voltage(Max.500V). Be aware of electronic shock when handling PDP Unit and don’t touch drive circuit. and even driver circuit’s capacitor is turned off but charge still remains there, so to touch drive circuit, be sure to wait at least 1 minute. 4. Warning when connecting signal & Power Connector in operation do not touch connector while Color PDP is operating. 5. PDP servicing and guarantee Glass and Drive Circuit section are linked and operating together. if you disassemble and assemble the product in your own hands , LGE is exempted from the guarantee of function, quality and etc. 6. Damage in still image Color PDP uses fluorescent material. The quality of PDP fluorescence by nature becomes deteriorated if using it in the same condition of CRT. To prevent this symptom, input full-screen regularly or use screensaver software. So do not display the still image for a long time. 7. Temperature & ventilation Color PDP’s Glass section and Drive circuit section emit the heat so the temperature shall be kept under 40. the temperature of glass section is pretty high because built-in drive circuit emits the heat. PDP is operating with high voltage therefore be sure to keep it away from conductive objects. 8. Warning when handling Module be aware that PDP shall not be touched by metal or hard objects and shocked by the heat or mechanical force. be careful when disassembling or handling. be sure to wear glove for preventing injury when the glass’s broken.
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Service warning 1. When inserting parts or PCB, fasten the lead line to terminal before soldering. 2. When inserting high- voltage resistance(metal oxide film resistance or metal film resistance), keep 10mm away from PCB 3. High-voltage or high-temperature parts shall be away from the lead line. 4. This chassis is insulation(cold) chassis but for safety, it is better to use insulation trance. when servicing power board, be sure to use insulation trance. 5. While PDP Module is in operation, do not connect or remove lines. ※ With COF or defect, report it to LGE PDP module service department.
Defect diagnosis tool 1. One DVM ( FLUKE 87 or similar type ) 2. Digital Oscilloscope ( over 200MHZ )
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MN-42PZ10 Spec & Features 91.5
1259
82
1056
Power : 220V 60Hz Power consumption : 340W
635 693.5
114.8
220 779.5
281
1379 aspect ratio: 16:9 color temperature : over 8500˚ K screen size (H X V) : 920.1 X 518.4mm viewing angle : over 160˚ resolution : 852 X 480 (VGA) input signal : NTSC, HD, VGA ,SVGA Cell Pitch (H X V) : 0.36 X 1.08 Twin Picture : PC/AV displayable colors (R,G,B) : 1,677K (256 X 256 X 256) PC input : D-SUB 15 brightness : 250 cd/ ㎡ (w/o filter : 550 cd/ ㎡ ) Control : D-SUB25 / STB connection contrast ratio : 250:1 (w/o filter ; 700:1 ) Video input : CVBS 5/79
S-Video input DVD input(Y,Cb,Cr)/R,L : Y/Y. Pb/Cb, Pr/Cr+R/L Audio input : R/L Power Cable : 3 심 (Ground terminal) Sound Output (Speaker) : R.L Out R,G,B input : D-SUB25 (RGBHV) : STB connection AC Input : 220V 60Hz
LG Electronics/DND QA Gr
Spec of Models
MN-42PZ10(42”W PDP MNT)
ITEMS
Screen Size: Aspect Ratio: Resolution: Peak Brightness : Contrast Ratio: Viewing Angle: Displayable Colors: Weight: Life:
SPECIFICATIONS(Tentative)
42 inch/ 106cm diagonal 16 :9 (width:height) 852 x 480 Pixels(SD grade) typ.240cd/m² (with filter 60%) 700:1(Dark Room & with filter 45%) 160° horizontally and vertically 16.7 million kg (MNT), kg(D/stand), kg(spk.)x2 >25,000 hours (elapsed time to 50% of initial brightness) Dimensions(MNT) : 105.6cm wide, 63.4cm high, 8.2cm deep Input Terminals : RF terminal(PAL/SECAM/NTSC) (Set Top Box) Composite Video input(RCA) X 2, S-Video Audio L&R input(RCA) X 2 Component Video (Y,Pb,Pr) + R/L for DVD Component Video (Y,Pb,Pr)+ R/L for HDTV Stb. RGB-SUB 15 pin for HDTV Stb.(480p/720p/1080i) Analog RGB-SUB 15pin(PC VGA ~SVGA)
Market : Korea / N_ America / S_America (2001. July ~)
Stereo Input for PC Audio Output Terminals : Analog RGB-SUB 15 pin(PC/DTV input by) (Set Top Box) Audio L&R(RCA) RGB-SUB 25 Pin for MNT(RGB/HV in & Control) Composite Video output + R/L output Input Terminals : Analog RGB-SUB 15 pin (Compatible with PC (MNT) VGA ~SVGA, Compressed XGA) RGB-SUB 25 Pin for STB(RGB/HV in & Control) Component Video (Y,Pb,Pr) for DVD & DTV Stb.
(Example of Desk Top Type)
Composite Video input(PAL/SECAM/NTSC) Audio L&R input(RCA)X2 Display Frequency : 15.73kHz to 60kHz horizontally, 50Hz to 75Hz(V) Picture : PIP(2Tuner:STB), Twin Picture, Digital Comb filter, Digital Video Enhancer(Jagging free ) Sound : A2 stereo, AVL, Dolby Virtual, 2x10Wrms Remote Control : Included(Unified) External Control : D-sub 25-pin connector Power Source : 110-240V , 50/60 Hz Power Consumption: 300 watts( with Max. Audio : 320W)
RN-BA11(3 System Multi STB) 430(W)X78(H)X280mm(D)
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PDP STB type & compatible model
SET TOP BOX
Compatible Model MN-40X3M , MN-40PA10, MN-40PA10A, MN-42PZ10, MN-60PZ10 all Model can be connected but because of noise problem with internal fan, it is terminated.Be sure that MN-40X3M is not compatible with SK-011T
DIGITAL SET TOP BOX
( SK-010T )
Separately : dedicated cable (AP-EA10)
MN-40PA10, MN-40PA10A, MN-42PZ10, MN-60PZ10 All but MN-40X3M can be used DIGITAL SET TOP BOX
( SK-011T ) separately : dedicated cable (AP-EA10)
MN-40PA10, MN-40PA10A only Only related model can be used. ANALOG SET TOP BOX ( RN-BA10 )
MN-42PZ10 only Only related model can be used ANALOG SET TOP BOX ( RNBA11 ) 7/79
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Ⅱ. Module diagram & spec
Y DRV Upper B/D ASSY
ZCNT TOP B/D ASSY
Label
P5
P3
P2 P300
P4
P100
Y DRV Lower B/D ASSY
ZSUS B/D ASSY Y SUS B/D ASSY
P6
VR2
P1
CTRL B/D ASSY
P2
VR1
VR1
P1
X LEFT B/D ASS’Y
X RIGHT B/D ASSY
P2
YDRV B/D ASSY
EXTERNAL CABLE CONNECTI ON connect or suppl y si gnal P1~P1[ X B/ D] 1V, 11V, VA P1[ Y SUS B/ D] VSC, VSETUP P1[ Y SUS B/ D] 1V, 11V, VS P1[ Z SUS B/ D] 1V, 11V, VS P666 [ CTRL B/ D] 1V P111 [ CTRL B/ D] VI DEO SI GNAL
1 1 1 1 1 1 1 1
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PART 1111 QTH 1111 QZH 6666 QTH 1111 QLH 1111 QRH 1111 QDP 1111 QDP 1111 QYH
NO. 111 B 111 B 666 B 111 A 111 A 111 B 111 B 111 A
ZCNT BOTTOM B/D ASSY pr oduct name s t andar d PWB( PCB) ASSYZCNT TOP B/ D ASSY PWB( PCB) ASSYZSUS B/ D ASSY PWB( PCB) ASSYZCNT BOTTOM B/ D ASSY PWB( PCB) ASSYX LEFT BOTTOM B/ D ASSY PWB( PCB) ASSYX RI GHT BOTTOM B/ D ASSY PWB( PCB) ASSYYDRV Upper B/ D ASSY PWB( PCB) ASSYYDRV Lower B/ D ASSY PWB( PCB) ASSYYSUS B/ D ASSY
LG Electronics/DND QA Gr
Y- Drive
POWER Board
Controller Board
CN1
CN2
Y- Board
Z- Board
VSC Board
Y- Drive EMI Filter X – Board ( R )
X – Board ( L )
Local key
Main Power
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Monitor Block diagram
2M-SDRAM STB
LA4282
LA7222
MICOM CXP750010
CXA2022S
MX88L284
Buffer HC541
PC
DVD
PDP MPDULE
Video
HC74
VPC3230
SDA9410
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CXA2101
THS8083
LG Electronics/DND QA Gr
MN-42PZ10 VSC(JAG200 & FLI2200) Block Diagram MONOSTALE MULTIBIB. RGBHV 5
VIDEO SWITCH
A/D CONVERTER
(M52758FP)
(CXA3516R)
SCALER
H
3
RGBHV 5
CLAMP_AD
SOG_OUT
RGB 3
MEMORY (6M-BYTE)
Buffer (74F574 x 4)
(JAG200)
PLLH/CLK 2
41P 8
4
H/V SOG
H/V/DE/CLK V H
CVBS
RGB 3
YCbCr/ YPbPr
(VPC3230D)
5 H/V/ FIELD/ LLC1 4
2
DISP_EN
H/V 2
COLOR DECODER
RGBHV DEINTERLACE (FLI2200)
H
ENHANCER (FLI2220)
COLOR CONTROL & VIDEO SWITCH
5
YUV
H/V/CLK/ HBLK/VBLK MEMORY (4M-BYTE)
H/V 2
Y,U,V,H,V
V
EPLD (GEN. CLAMP)
Clamp
(CXA2101Q)
5
Y,Pb,Pr(MNT) 3 Y,Pb,Pr(STB) 3
AUDIO R
L
AUDIO AMP LA4282(L&R)
Sound Processor (MSP3401G)
(74HCT373)
MICOM
ROM (AT29C010)
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PORT EXP (M62320X3)
EEPROM X2416P
LG Electronics/DND QA Gr
RN-BA11(Tuner Receiver) Block - Diagram
Ro
L/R
PC
Lo MSP3401G 2’nd SiF TUNER.1
TUNER.2
Sound Processor
TV (M)
M52758FP RGB/YUV S/W
L/R
L/R(tv) TV (S)
RGB(PC)
RGB (DTV)
L/R(tv)
M52756FP CVBS Y,Pb,Pr(DTV)
VPC3230D (SUB) Video Proessor
Y/C
S-VHS
Y/C
CXA2069Q
※ AUDIO 공용
외부입력 1
OPTION
RGB
RGB/YUV S/W
RGB(OSD)
CXA2119M
YUV
S/W
Y/C V, L/R
A/V SW
CVBS
DCF WE
MS81V04160 외부입력 2
V, L/R
Y/C DVD_Y
MNT_OUT
RE
VPC3230D
FRAME MEMORY
(MAIN) LGTV1001 DRP
Vido Proessor
+
Y,Cr,Cb (DVD)
DVD/DTV
Y,Pb,Pr(DTV)
(RCA JACK)
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Product back & monitor in/output section
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Connecting 25 Pin cable (when connecting 25 Pin cable, Connect external equipment to STB) LG Electronics/DND QA Gr
Connection diagram (back cover’s open)
Controller Board
Z-Board Power Board
Y-Drive (TOP)
VSC Board Y-Board
EMI Filter
Y-Drive (Bottom)
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Exploded view (Back Cover, VSC, EMI, Power )
VSC BOARD
EMI Filter
POWER BOARD
BACK COVER
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Exploded view (Module)
CONTROL BOARD
Z-BOARD Y-Drive BOARD
Y-Drive BOARD
X-BOARD X-BOARD Y-BOARD
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Parts (back covers open)
Y-Drive Board (Top)
Y-Board
Y-Drive Board
Control Board(Back)
VSC Board(Front)
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Power Board
EMI Filter
Z- Board
Main Power Switch
LG Electronics/DND QA Gr
EMI Filter & VSC Board are separated Y-Drive Board
Y-Board
Control Board
Z-Board
X-Board ( Right)
X-Board ( Left )
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Power Board ( SMPS )
Power well power Board-Korean market
Murata Power Board
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LG Electronics/DND QA Gr
Ⅲ. Screen defect diagnosis 1. The 4/7 or 3/7 of screen is not displayed. 1) Check the X B/D power connector. 2) Check the connector between CTRL B/D and X B/D. 3) Replace the X B/D.
※ relations between screen and X B/D screen left 4/7 of screen right 3/7 of screen
X B/D ↔ ↔
Right X B/D Left X B/D
※ type
i) screen’s left(4/7)
ii) Screen’s right(3/7)
Displaying part Non-displaying part
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2. No image by Data COF. (the case one Data COF is totally or partially not displayed included) 1) It is mainly caused by related Data COF and X B/D connection error. 2) Check the connector between that Data COF & X B/D. 3) When Data COF has a defect, replace the related X B/D.
※ examples of screen display type ( beside the below, any out of 7 Data COF can be occurred. )
ok partially displaying Non-image
※ Data COF IC test method Set ① pattern( GND ) to ANODE, ② Pattern (resistance t part ) to CATHOD, Test diode forward and backward. Measure ③ resistance value.(10Ω) ② resistance
① GND
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3. Data COF IC unit error 1) As pictures below, this is caused by the clock error of Data COF IC 2) With
,
,
, check Data COF connector and replace the X B/D. 3) With
,
, check the connector between CTRL B/D & X B/D and replace X B/D or CTRL B/D.
※ Cases
One IC error in one COF
Two every-second IC error in one
4 IC errors in one COF
Data COF IC unit error in the whole X B/D
Data COF IC unit error in the whole screen.
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4. Regular vertical line with one or more Data COF IC 1) Regular vertical line with one Data COF IC is mainly caused by X B/D output terminal buffer’s output error. When two Data COF ICs have regular vertical lines, it means the data transfer from Controller B/D to X B/D has an error. 2) Check the related X B/D connector. 3) Replace that X B/D or CTRL B/D
※ relation between screen & X B/D
screen
※ case
X B/D
left 4/7 of bottom screen
↔
Right X B/D
right 3/7 of bottom screen
↔
Left X B/D
Partial error or total error with One or more ICs defect.
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5. The screen by Scan FFC is not displayed 1) It is mainly caused by the bad connection between Scan FFC & Y B/D. 2) Check the related connector between Scan COF & Y B/D. 3) When Scan IC has a defect, replace the related Y DRV B/D.
1/8 of the screen
※ case ● ● ●
OK total or partial non- image ※ SCAN IC check
Set Vpp Pin to ANODE, GND pin to CATHOD and test diode forward and backward.
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6. Regular vertical lines in the whole screen. (mainly in one specific color, regular line is flicking) 1) This problem is related to CONTROL B/D. 2) Replace CONTROL B/D
※case
Regular vertical lines in the whole screen
7. Vertical Data copy 1) It possibly happens when scan wave does not form properly. 2) Replace Y DRVB/D or Y SUS B/D
※ case
<pattern supposed to display>
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8. One or more vertical lines in the screen. 1) Irregular vertical line is not related to Controller B/D or X B/D. 2) It is mainly caused by the followings open(or short). - itself defect - DATA COF FPC attached to is open or short. - DATA COF attached to itself defect 3) Replace module
※ case
There are several types. Several lines in ¼ area. It can be seen on the both side, right and left. The area is sometimes over ¼.
9. One or more horizontal lines in the screen. 1) Irregular borizontal line is not related to Controller B/D or Y B/D. 2) It is mainly caused by the followings open(or short). - itself defect - SCAN FPC attached to is open or short. - SCAN IC attached to itself defect 3) Replace Y DRV B/D
※ case Not always like this. There can be several horizontal lines
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10. Input signal pattern is displayed but the whole brightness of the screen is dark. 1) It happens when Z B/D is not operating well. 2) Check whether Z B/D’s power connector is plugged . 3) Check whether the connector between Controller B/D & Z B/D is plugged. 4) Replace Controller B/D or Z B/D.
11. In full white pattern, foreign color is displayed or in full black pattern, mis-discharge is partially occurred. 1) Check the slope of Y B/D set up, set down waveform. 2) Check the slope of Z B/D’s ramp waveform 3) Measure each B/D’s output waveform by over 200MHz oscilloscope and compare it to the below picture. it is possible to control Y B/D’s setup slope by adjustinng VR2, setdown slope by VR1 and Z B/D’s ramp slope by VR1.. - Y B/D measurement point : TP ( Connector P4 36 pin ) - Z B/D measurement point : connection part ( SUS_OUT )
230V Vsetup 175V Vs 0V
175V Vs
setup 25µs
15µs
20µs
setdown 230µs
Z RAMP voltage wave
Y output voltage wave
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12. In full white pattern, the brightness is getting darker toward the center. 1) It happens with Z B/D’s ramp waveform 2) Check the connection between CTRL B/D and Z B/D’s connection cable. 3) Replace Z B/D.
※ case
13. A specific brightness of one color is not clear. 1) Check CTRL B/D’s input signal connector. 2) Replace CTRL B/D.
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Ⅳ. Non-picture Defect diagnosis. Non- image or same symptom when power off or black pattern. 1) Check CTRL B/D’s LED(D1~D4). 2) Check the power or signal cable input into CTRL B/D. 3) Check X B/D, Y B/D and Z B/D’s power connector. 4) Check the connector between CTRL B/D and X B/D, Y B/D, Z B/D respectively. 5) Measure each X, Y, Z B/D’s output waveform with over 200MHz oscilloscope and compare it to the below picture to detect the defect and replace that. - Y B/D measurement point : TP ( Connector P4 36 pin ) - Z B/D measurement point : connection part ( SUS_OUT ) - X B/D measurement point : L1(RIGHT), L2(LEFT BOTTOM) 6)Test scan(Y) IC. 7)Test data(X) COF IC 8)Replace CTRL B/D.
1Frame(16.7ms) 5) Test scan(Y) IC. 6) Test data(X) COF IC. 7) Replace CTRL B/D.
< A: Y B/D output waveform - 1 FRAME > < B: Y B/D output waveform - 1 SF > < B: Y B/D output waveform - 2 SF(non-Setup SF) >
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< A: Y B/D output waveform - 1Frame > < B: Y B/D output waveform - 7~12 SF(SE) >
< A: Z B/D output waveform - 1Frame >
< B: Z B/D output waveform - 1SF >
< X B/D output waveform - 1 FRAME > < X B/D output waveform - 1 SF > < X B/D output waveform - amplification >
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Ⅴ. One Point Service Guide
42 Inch
42” PDP Flicker and No Raster Troubleshooting Guide cause : bad connection between Y-Board # 1, 2 drive board Connector pin
P6 Rework should be done P4 Y-Driver Board
Y-Board 31/79
LG Electronics/DND QA Gr
② ②
①
P4
P6 ② ①
①
② ①
amplified
amplified ① : outside Leg ② : inside Leg
①
•P 6, P 4 both are the first pin, when wiring, it should be done as picture shown. (bend the wire to Y-Driver B/D not to Y-B/D . If not there can be noise)
②
①
②
•Don’t be confused with Pin number •Improved since Dec,2001.
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①
① ②
②
②
① ②
①
Be sure not to misconnect the line. See the picture precisely and then connect jump wire at the exact point
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Intermittent no-image/image error while watching X CANVAS
X CAVBAS
The screen is intermittently disappeared . LED is green
screen is distorted weiderly (happened 2 a day)
X CANVAS cause : bad connection between Y-Board and #1, 2 pin of Y-Drive Board Connector
troubleshooting : connect bad linking between Y-Board & Y-Drive with jump wire (all 4 parts) see working instruction(revised since Dec,2001. 1) 34/79
normal
LG Electronics/DND QA Gr
No Power X CANVAS
X CANVAS
No Power ( in ST-BY mode, but no LED)
normal
Check the power supply & main power S/W on Check EMI board fuse (check the rated capacity )
Be sure to use rated fuse. Fuse 15 A
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No Raster X CAVBAS
X CANVAS
when Power’s on, after 2 ~ 3 sec, it’s off ( LED changing green into red )
normal
CHECK : remove STB and operate monitor individually. (check STB defect or Monitor defect ) When using ANALOG STB, check STB only MN-42PZ10 only STB : RN-BA11 Remove each Board’s power supply connector and check the power is off. When the power is not off,replace the related board.
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No Picture X CANVAS
X CANVAS
no picture (LED’s green)
normal
Core checkpoint : remove STB and operate monitor individually. (check whether STB’s a defect or monitor’s one) With monitor defect, check VSC and then Controller Board. Troubleshooting : replace VSC Board
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Address Bar ( Horizontal Bar ) X CANVAS
X CANVAS
no image (LED’s green)
normal
Cause : Y-Drive ( Bottom ) defect Troubleshooting : Y-Drive (lower part) replacement This problem is shown in the bottom of screen, So it is caused by Y-Drive
Y-Drive Board ( Bottom ) 38/79
LG Electronics/DND QA Gr
Address Bar ( Horizontal Bar ) X CANVAS
X CANVAS
no image (LED’s green)
normal
Y-Drive Board ( Top ) Cause : Y-Drive Board (upper part) defect Troubleshooting : Y-Drive Board replacement
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No Picture X CANVAS
X CANVAS
no image (LED’s green)
normal PD501 Connector
cause : PD-501 Connector point defect troubleshooting : PD-501 Connector replacement (with PD-501 Connector point defect, Various defect symptoms can be seen)
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LG Electronics/DND QA Gr
High frequency noise (“Bee” sound) X CANVAS
X CANVAS
normal picture with high frequency noise (“bee”)
normal
SMPS is supposed to operate with high frequency so small noise is not considered as a defect. Power (SMPS) Board 1. C8178 0.22 ㎌ /50V add 2. Open C8139 right lead, and then connect it to R8164 right lead. Improved since Nov,2001
C8178 0.22uF electrolytic capacitor insertion
#. Slight noise is not a defect and write down explanation
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Open C8139 right lead and then wire R8164 right lead LG Electronics/DND QA Gr
No picture in right- 2/5 area X CANVAS
X CANVAS
normal
No picture in the right- 2/5 area
X-Board ( Left ) power supply check X-Board ( Left )Connector check X-Board ( Left ) replacement
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Address Bar (Vertical ) X CANVAS
X CANVAS
normal
stripe in right-2/5 area X-Board ( Left ) power supply check X-Board ( Left ) Connector check X-Board ( Left ) replacement
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No picture in left 3/5 of the screen X CANVAS
X CANVAS
normal
left 3/5 of screen with vertical stripes
X-Board ( Right ) power supply check X-Board ( Right )Connector check X-Board ( Right ) replacement
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LG Electronics/DND QA Gr
Address Bar (Vertical ) X CANVAS
X CANVAS
normal
left 3/5 of screen with vertical stripes.
X-Board ( Right ) power supply check X-Board ( Right )Connector check X-Board ( Right ) replacement
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LG Electronics/DND QA Gr
No Red X CANVAS
X CANVAS
no Red ( B or G )
normal
Test Monitor individually. If detect a problem with monitor, check VSC Board. If it has a problem with STB connecting, focus on 25 Pin. Be sure not to connect 5 Pin (AP-EA10) by force 25 Pin Cable P/No : GVZ AP-EA10
Be sure not to bend it by force or internal Insulated conductor can be down. 46/79
LG Electronics/DND QA Gr
1) X - Board COF Connector separation Lift up the right and left of X-BOARD CONNECTOR.
42 Inch Lift up X-BOARD CONNECTOR and separate COP CONNECTOR by pulling up.
When you handle COF CONNECTOR, don’t pressure. First release LOCK and separate. If COF CONNECTOR is damaged, you should replace MODULE ASS’Y. So, be aware of this!!
COF Connector
Warning When Whenyou youexchange exchangeX-Board, X-Board,first firstyou youshould shouldseparate separateCOF COF Connector. Be careful to handle it. Connector. Be careful to handle it. COF COFConnector Connectorisisattached attachedto to Module. Module.When WhenCOF COFConnector Connectorisis broken, Module ASS’Y must be replaced a new one. broken, Module ASS’Y must be replaced a new one.
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2) X - Board Connector separation
Lift up each edge of left/right.
Lifted condition Be careful to handle LOCK or it can be broken. When LOCK is broken, replace a new X-BOARD.
Warning It’s easy to separate it by releasing Connector Lock . Do not pressure or it can be hurt. When LOCK is hurt, replace a new X-BOARD
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3) Y - Board COF Connector separation
Pull the white LOCK as shown in arrow
Pull the white LOCK as shown in arrow.
Separate COF CONNECTOR by pulling in the left. Warning Be careful to handle LOCK and COF Connector. When LOCK part is damaged, you should replace a new Y-Board. In case of COF Connector, Module Assembly.
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LG Electronics/DND QA Gr
4) Z - Board COF Connector separation
Separate the fixed Screw of Z-Board. Pull out Lock as shown in arrow.
Condition in Lock part is pulled
COF Connector
Warning Be careful not to tear COF Connector. If COF Connector is torn, replace a new Module Assembly
50/79
Pull COF Connector as shown in arrow. It’s easy to separate COF on condition that Z-Board Screw is separated. In case Z-Board is assembled, it’s really hard to separate.
LG Electronics/DND QA Gr
5) Connector separation Guide Push LOCK and pull out PUSH
PUSH
PUSH
PUSH
PUSH
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PULL
LG Electronics/DND QA Gr
6) Control Board & VSC Board Connector
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LG Electronics/DND QA Gr
7) Gas injection (Sealing up) condition
Be sealed up after gas injection
Be sealed up after gas injection
Warning
Be careful to handle the sealed-up part after gas injection. If it is broken, the gas escapes. So, replace the Module.
53/79
LG Electronics/DND QA Gr
8) Power off in 2 ~ 3 minutes(Protection) Power PowerisisOn Onand andoff off2~3 2~3minutes. minutes. (Protection) (Protection) OK
P301 P301Connector ConnectorOpen Open Check. Check.
XX--Board BoardTop TopRight Right Change. Change. OK
P302 P302Connector ConnectorOpen Open Check Check
XX--Board BoardTop TopLeft Left Change. Change. OK
P303 P303Connector ConnectorOpen Open Check Check
P304 P304Connector ConnectorOpen Open Check Check
XX--Board BoardBottom BottomRight Right Change. Change. OK
P102 P102Connector ConnectorOpen Open Check Check
XX--Board BoardBottom BottomLeft Left Change. Change. OK
P3, P3,P2 P2Connector ConnectorOpen Open Check Check
ZZ--Board Board Change. Change. OK
P005, P005,P003 P003Connector ConnectorOpen Open Check Check PROTECT PROTECT operation; operation;
P006 P006Connector ConnectorOpen Open Check Check
When When the the load load voltage voltage is is short. short. When When each each voltage doesn’t doesn’t work work (in (in general) general)
YY--Board Board Change. Change. OK
VSCVSC-Board Board Change. Change. OK
VSC VSC--Board Board Change. Change. Sound Output IC Short Sound Output IC ShortCheck Check
Power Power Board Board Change Change
54/79
LG Electronics/DND QA Gr
9) Power off in 2 ~ 3 minutes(Protection)
L813 Cold Solder
Symptom : As soon as the power on, it’s off in 2 - 3minutes. (PROTECT operation) Cause : No VS voltage L813 Coil cold soldering.
Check Check Open the Connector connecting to each Board to check the power is off. if each Board is same, check the Power Board and voltage.
55/79
LG Electronics/DND QA Gr
10) ADD BAR inspection and repair
Press the ADJ KEY and check the position of add bar by changing WHITE or RED or BLUE or GREEN
HEATRUN : WHITE
Top Right
Bottom Right
Top Left
Bottom Left
MP-40PA10 uses 4 board such as left,right, top and bottom. Divide the screen in 4 and once you see ADD BAR check COF CONNECTOR between MODULE and X-BOARD. If there is no defect in COF CONNECTOR replace X-BOARD. But the problem still remains and check the connector between X-BOARD and CONTROL BOARD. And if you can’t find defect, check CONTROL.
56/79
LG Electronics/DND QA Gr
11) One Point Service Guide
Symptom : B color 1 Address line Open Cause : Dented COF
COF is dented
57/79
LG Electronics/DND QA Gr
Symptom : Inferior R Address color Cause : Inferior DATA output by cold soldering 16 pin of IC14 in X-L-TOP ( Normal waveform after tearing off IC Pin) Countermeasure : Replace X-L-TOP board.
IC14
Cold Soldering
Abnormal waveform by cold soldering Normal waveform after tearing off IC pin
58/79
LG Electronics/DND QA Gr
Symptom
Causes
Countermeasure
If 15V line voltage reduces below 14V, Mis-discharge occurs and power off because of protection circuit.
Replace PSU (Power Supply Unit) and defective X-Board.
Defective X-Board
The blue spreads on the screen (Mis-discharge) and power off in 2 ~ 3 seconds. If you turn on again, it will be same problem. Check Check If when Power on, screen shows like above and turn off in 2 seconds, check if turning off or not by disconnecting all X & Y boards.
59/79
LG Electronics/DND QA Gr
Symptom
Cause
No 5V supply to Top right X-Board.
Countermeasure
Connect 5V line
The top left part of screen is broken (Top Right X-BOARD)
Check Check Check Top right X-BOARD 5V.(If 0V, it happens) Check 5V line from SMPS to X-BOARD.
60/79
LG Electronics/DND QA Gr
Cause
Symptom
No Va(70V) supply to Top right X-Board.
Countermeasure
Connect 70V line
Pinkish screen in the top left. (Top right X-BOARD)
Check Check Check Top right X-BOARD Va(70V).(If 0V, it happens) Check 70V(Va) line from SMPS to X-BOARD.
61/79
LG Electronics/DND QA Gr
Cause
Symptom
Countermeasure
No 12V supply to Top right X-Board.
Connect 12V line
No Va(70V) supply to Top right X-Board.
Connect 70V line
The 3/5 top left in the screen is blank (Top Right X-BOARD) Check Check Check Top right X-BOARD 12V.( If 0V, it happens ) Check Top right X-BOARD Va(70V).(If 0V, it happens) Check 12V & 70V(Va) line from SMPS to X-BOARD.
62/79
LG Electronics/DND QA Gr
Cause
Symptom
Countermeasure
No 12V supply to Top left X-Board.
Connect 12V line
No Va(70V) supply to Top left X-Board.
Connect 70V line
The 3/5 top right of the screen is blank. (Top left X-BOARD) Check Check Check Top left X-BOARD 12V.( If 0V, it happens ) Check Top left X-BOARD Va(70V).(If 0V, it happens) Check 12V & Va(70V) line from SMPS to X-BOARD.
63/79
LG Electronics/DND QA Gr
Cause
Countermeasure
P1 COF connector on Top left X-Board is open.
Reassemble it
Symptom
Pinkish screen in the 1/5 top right (Top left X-BOARD)
Check Check Check the point and Locking of P1 on Top left X-BOARD.
64/79
LG Electronics/DND QA Gr
Symptom
Cause
No 5V supply to bottom right X-Board.
Countermeasure
Connect 5V line
The 3/5 bottom left of screen is broken. (BOTTOM RIGHT X-BOARD)
Check Check Check Bottom right X-BOARD 5V.( If 0V, it happens ) Check 5V line from SMPS to X-BOARD.
65/79
LG Electronics/DND QA Gr
Cause
Symptom
No 12V supply to bottom right X-Board.
Countermeasure
Connect 12V line
No Va(70V) supply to bottom right X-Board.
The 3/5 bottom left of the screen is Blank. (Bottom Right X-BOARD)
Check Check Check Bottom right X-BOARD 12V.( If 0V, it happens ) Check 12V line from SMPS to X-BOARD.
66/79
LG Electronics/DND QA Gr
Symptom
Cause
No 5V supply to bottom left X-Board.
Countermeasure
Connect 5V line
The 2/5 right of the screen is broken. (Bottom left X-BOARD)
Check Check Check Bottom left X-BOARD 5V.( If 0V, it happens ) Check 5V line from SMPS to X-BOARD.
67/79
LG Electronics/DND QA Gr
Cause
Symptom
No 12V supply to bottom left X-Board.
Countermeasure
Connect 12V line
The 2/5 right part of the screen is blank. (Bottom left X-BOARD )
Check Check Check Bottom left X-BOARD 12V.( If 0V, it happens ) Check 12V line from SMPS to X-BOARD.
68/79
LG Electronics/DND QA Gr
Cause
Countermeasure
The connecting of X-Board bottom left connector is bad.
Reassemble it.
Symptom
ADDRESS bar appears in the right bottom of the screen. (X-BOARD BOTTOM LEFT)
Check Check Check connecting of the connector of bottom left X-BOARD. Reassemble it. X-BOARD BOTTOM LEFT CONNECTOR OPEN.
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LG Electronics/DND QA Gr
Examples
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LG Electronics/DND QA Gr
Symptom
Cause
Connector(P13) is OPEN or Connecting condition is bad
Countermeasure
Reassemble P13.
Screen is divided in top and bottom, and vertical bar appears.
Check Check P13 CONNECTOR point inferior CHECK. P13 CONNECTOR SIGNAL CHEK. P13 CONNECTOR
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LG Electronics/DND QA Gr
Symptom
Cause
VSC Board Connector is Open.
Countermeasure
Reassemble VSC Board Connector
Screen is broken and has the vertical/horizontal bar.
Check Check Check the connector connecting Reassemble the Connector
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LG Electronics/DND QA Gr
Symptom
Cause
Loose VSC Board Connector
Countermeasure
Reassemble VSC BOARD Connector
The screen is bluish(Mosaic screen)
Check Check Check the connection condition of the Connector. Reassemble the Connector.
73/79
LG Electronics/DND QA Gr
Symptom
Cause
Countermeasure
Bad IC203
Replace IC203(VPC3230D)
The mosaic appears in the screen when it connects to VIDEO Input. (The sensibility of Y-signal is low.) When connected to Component Input, it is O.K.
Check Check
Check if X201 on VSC board oscillates. Check Video In/Out of IC203 on VSC board. IC201 (VPC3230D) Decoder IC 74/79
LG Electronics/DND QA Gr
Examples
IC201(VPC3230D) Decoder is inferior 75/79
LG Electronics/DND QA Gr
Cause Countermeasure
Symptom
Bad Connector connecting Control Board and VSC B/D.
Change the Connector
Abnormal
Normal
Noise with division of colors
Check Check point and signal condition of Connector Control Board and VSC Board.
Bad Connector 76/79
LG Electronics/DND QA Gr
Name
No signal Vertical Bar Symptom
Cause and Countermeasure 1.Cause : Bad IC2 (DA1) ▶ IC2 DA1(Data Arrange) No.162 Pin output is changing depending on the temperature.⇒ abnormal X-B’d Buffer IC * Room temperature : 2.5V Output (Normal Pin = over 2.8V) * Heated : 1.5V Output(Normal Pin = 2.7V ) ⇒ Bad IC2 (DA1) 2. Countermeasure : Replace IC2 < Waveform of normal pin> ─ heated
8cm
Realization
< Waveform of abnormal pin > ─ heated
DA1
DA1
Buffer
Buffer
When ASIC Chip(IC2 DA1 LGD4001) on Control Board gets high temperature, you can observe it (In normal temperature it’s O.K. ) Buffer(74ACT541) waveform abnormally narrows. →In this case, it is impossible for Flip Flop(74AC574) on X B/D to read data.
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LG Electronics/DND QA Gr
Name
Add Open (Green 1 Line) Symptom
Cause and Countermeasure 1.cause: Add. COF Drive IC inferior
Add. COF Drive IC
Normal Line Data waveform
Open Line Data output waveform
▶ the output of inferior line less than that of the normal Line Add. COF Drive IC inferior ▶ COF inspection 검사기 : 24V Open check (normal 50V)
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LG Electronics/DND QA Gr
Name
Vertical bar when Power off/on(Mis-discharge) Symptom
Cause and Countermeasure 1.Cause : Control board malfunctions when Power off/on. 2.Countermeasure: Change some parts on Control board. 3.Changing parts : A32_CTRL_03 B/D (Marked on PCB) -.R14,17,18,21 : 330 ==> 4.7K (Chip Resistor) -.R15,16,19,20 : 22K ==> 4.7K (Chip Resistor) -.C504, 505 : 0.1uF / 50V add (Chip Capacitor) Control board
Realization 1.PDP Power on Mode external input (regardless of wire/wireless signal but it’s easy to reenact in wireless signal) 2. Remove Power Cord (Power’s off) 3.after about 20minutes, insert Power cord (automatically the Power’s on and the vertical bar is shown as above)
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LG Electronics/DND QA Gr
LG Electronics / DND QA
Contents Ⅰ. Usage/Service Points to be concerned Ⅱ. Module formation & spec Ⅲ. Screen defect diagnosis 1. 4/7 or 3/7 of screen is not displayed. 2. Screen by Data COF is not displayed. 3. one or more of Data COF IC have regular vertical lines. 4. Data COF IC unit error pattern 5. The screen by Scan COF is not displayed. 6. Regular- interval vertical line in the whole screen. 7. Vertical data copy 8. One or more vertical bars. 9. One or more horizontal bars. 10. Input signal pattern is displayed but the whole brightness of screen is dark. 11. In full white pattern, foreign color is displayed or in full black pattern, misdischarge is partially occurred.. 12. In full white pattern, the brightness is getting darker toward the center. 13. A specific brightness of one color is not clear.
Ⅳ. Non-picture defect diagnosis Ⅴ. One Point Service Guide(42 Inch, 40 Inch)
Ⅰ. Usage/Service points to be concerned Color PDP is a display device consisting of section & Drive section. section is composed of electrode, fluorescent substances ,dielectrics and gases, and drive section is a combination of electrical circuit section and PCB section. We call this concrete as PDP Module Ass’y and the following shows warning. SUGGGESTIONS 1. Static precaution Drive section circuit is C-MOS circuit, so to protect against static electricity, wear static-proof wrist band. 2. Cleaning when wiping , do not use liquid cleaner or other chemicals . Use a damp cloth for cleaning . 3. handling Color PDP uses high voltage(Max.500V). Be aware of electronic shock when handling PDP Unit and don’t touch drive circuit. and even driver circuit’s capacitor is turned off but charge still remains there, so to touch drive circuit, be sure to wait at least 1 minute. 4. Warning when connecting signal & Power Connector in operation do not touch connector while Color PDP is operating. 5. PDP servicing and guarantee Glass and Drive Circuit section are linked and operating together. if you disassemble and assemble the product in your own hands , LGE is exempted from the guarantee of function, quality and etc. 6. Damage in still image Color PDP uses fluorescent material. The quality of PDP fluorescence by nature becomes deteriorated if using it in the same condition of CRT. To prevent this symptom, input full-screen regularly or use screensaver software. So do not display the still image for a long time. 7. Temperature & ventilation Color PDP’s Glass section and Drive circuit section emit the heat so the temperature shall be kept under 40. the temperature of glass section is pretty high because built-in drive circuit emits the heat. PDP is operating with high voltage therefore be sure to keep it away from conductive objects. 8. Warning when handling Module be aware that PDP shall not be touched by metal or hard objects and shocked by the heat or mechanical force. be careful when disassembling or handling. be sure to wear glove for preventing injury when the glass’s broken.
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LG Electronics/DND QA Gr
Service warning 1. When inserting parts or PCB, fasten the lead line to terminal before soldering. 2. When inserting high- voltage resistance(metal oxide film resistance or metal film resistance), keep 10mm away from PCB 3. High-voltage or high-temperature parts shall be away from the lead line. 4. This chassis is insulation(cold) chassis but for safety, it is better to use insulation trance. when servicing power board, be sure to use insulation trance. 5. While PDP Module is in operation, do not connect or remove lines. ※ With COF or defect, report it to LGE PDP module service department.
Defect diagnosis tool 1. One DVM ( FLUKE 87 or similar type ) 2. Digital Oscilloscope ( over 200MHZ )
4/79
LG Electronics/DND QA Gr
MN-42PZ10 Spec & Features 91.5
1259
82
1056
Power : 220V 60Hz Power consumption : 340W
635 693.5
114.8
220 779.5
281
1379 aspect ratio: 16:9 color temperature : over 8500˚ K screen size (H X V) : 920.1 X 518.4mm viewing angle : over 160˚ resolution : 852 X 480 (VGA) input signal : NTSC, HD, VGA ,SVGA Cell Pitch (H X V) : 0.36 X 1.08 Twin Picture : PC/AV displayable colors (R,G,B) : 1,677K (256 X 256 X 256) PC input : D-SUB 15 brightness : 250 cd/ ㎡ (w/o filter : 550 cd/ ㎡ ) Control : D-SUB25 / STB connection contrast ratio : 250:1 (w/o filter ; 700:1 ) Video input : CVBS 5/79
S-Video input DVD input(Y,Cb,Cr)/R,L : Y/Y. Pb/Cb, Pr/Cr+R/L Audio input : R/L Power Cable : 3 심 (Ground terminal) Sound Output (Speaker) : R.L Out R,G,B input : D-SUB25 (RGBHV) : STB connection AC Input : 220V 60Hz
LG Electronics/DND QA Gr
Spec of Models
MN-42PZ10(42”W PDP MNT)
ITEMS
Screen Size: Aspect Ratio: Resolution: Peak Brightness : Contrast Ratio: Viewing Angle: Displayable Colors: Weight: Life:
SPECIFICATIONS(Tentative)
42 inch/ 106cm diagonal 16 :9 (width:height) 852 x 480 Pixels(SD grade) typ.240cd/m² (with filter 60%) 700:1(Dark Room & with filter 45%) 160° horizontally and vertically 16.7 million kg (MNT), kg(D/stand), kg(spk.)x2 >25,000 hours (elapsed time to 50% of initial brightness) Dimensions(MNT) : 105.6cm wide, 63.4cm high, 8.2cm deep Input Terminals : RF terminal(PAL/SECAM/NTSC) (Set Top Box) Composite Video input(RCA) X 2, S-Video Audio L&R input(RCA) X 2 Component Video (Y,Pb,Pr) + R/L for DVD Component Video (Y,Pb,Pr)+ R/L for HDTV Stb. RGB-SUB 15 pin for HDTV Stb.(480p/720p/1080i) Analog RGB-SUB 15pin(PC VGA ~SVGA)
Market : Korea / N_ America / S_America (2001. July ~)
Stereo Input for PC Audio Output Terminals : Analog RGB-SUB 15 pin(PC/DTV input by) (Set Top Box) Audio L&R(RCA) RGB-SUB 25 Pin for MNT(RGB/HV in & Control) Composite Video output + R/L output Input Terminals : Analog RGB-SUB 15 pin (Compatible with PC (MNT) VGA ~SVGA, Compressed XGA) RGB-SUB 25 Pin for STB(RGB/HV in & Control) Component Video (Y,Pb,Pr) for DVD & DTV Stb.
(Example of Desk Top Type)
Composite Video input(PAL/SECAM/NTSC) Audio L&R input(RCA)X2 Display Frequency : 15.73kHz to 60kHz horizontally, 50Hz to 75Hz(V) Picture : PIP(2Tuner:STB), Twin Picture, Digital Comb filter, Digital Video Enhancer(Jagging free ) Sound : A2 stereo, AVL, Dolby Virtual, 2x10Wrms Remote Control : Included(Unified) External Control : D-sub 25-pin connector Power Source : 110-240V , 50/60 Hz Power Consumption: 300 watts( with Max. Audio : 320W)
RN-BA11(3 System Multi STB) 430(W)X78(H)X280mm(D)
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LG Electronics/DND QA Gr
PDP STB type & compatible model
SET TOP BOX
Compatible Model MN-40X3M , MN-40PA10, MN-40PA10A, MN-42PZ10, MN-60PZ10 all Model can be connected but because of noise problem with internal fan, it is terminated.Be sure that MN-40X3M is not compatible with SK-011T
DIGITAL SET TOP BOX
( SK-010T )
Separately : dedicated cable (AP-EA10)
MN-40PA10, MN-40PA10A, MN-42PZ10, MN-60PZ10 All but MN-40X3M can be used DIGITAL SET TOP BOX
( SK-011T ) separately : dedicated cable (AP-EA10)
MN-40PA10, MN-40PA10A only Only related model can be used. ANALOG SET TOP BOX ( RN-BA10 )
MN-42PZ10 only Only related model can be used ANALOG SET TOP BOX ( RNBA11 ) 7/79
LG Electronics/DND QA Gr
Ⅱ. Module diagram & spec
Y DRV Upper B/D ASSY
ZCNT TOP B/D ASSY
Label
P5
P3
P2 P300
P4
P100
Y DRV Lower B/D ASSY
ZSUS B/D ASSY Y SUS B/D ASSY
P6
VR2
P1
CTRL B/D ASSY
P2
VR1
VR1
P1
X LEFT B/D ASS’Y
X RIGHT B/D ASSY
P2
YDRV B/D ASSY
EXTERNAL CABLE CONNECTI ON connect or suppl y si gnal P1~P1[ X B/ D] 1V, 11V, VA P1[ Y SUS B/ D] VSC, VSETUP P1[ Y SUS B/ D] 1V, 11V, VS P1[ Z SUS B/ D] 1V, 11V, VS P666 [ CTRL B/ D] 1V P111 [ CTRL B/ D] VI DEO SI GNAL
1 1 1 1 1 1 1 1
8/79
PART 1111 QTH 1111 QZH 6666 QTH 1111 QLH 1111 QRH 1111 QDP 1111 QDP 1111 QYH
NO. 111 B 111 B 666 B 111 A 111 A 111 B 111 B 111 A
ZCNT BOTTOM B/D ASSY pr oduct name s t andar d PWB( PCB) ASSYZCNT TOP B/ D ASSY PWB( PCB) ASSYZSUS B/ D ASSY PWB( PCB) ASSYZCNT BOTTOM B/ D ASSY PWB( PCB) ASSYX LEFT BOTTOM B/ D ASSY PWB( PCB) ASSYX RI GHT BOTTOM B/ D ASSY PWB( PCB) ASSYYDRV Upper B/ D ASSY PWB( PCB) ASSYYDRV Lower B/ D ASSY PWB( PCB) ASSYYSUS B/ D ASSY
LG Electronics/DND QA Gr
Y- Drive
POWER Board
Controller Board
CN1
CN2
Y- Board
Z- Board
VSC Board
Y- Drive EMI Filter X – Board ( R )
X – Board ( L )
Local key
Main Power
9/79
LG Electronics/DND QA Gr
Monitor Block diagram
2M-SDRAM STB
LA4282
LA7222
MICOM CXP750010
CXA2022S
MX88L284
Buffer HC541
PC
DVD
PDP MPDULE
Video
HC74
VPC3230
SDA9410
10/79
CXA2101
THS8083
LG Electronics/DND QA Gr
MN-42PZ10 VSC(JAG200 & FLI2200) Block Diagram MONOSTALE MULTIBIB. RGBHV 5
VIDEO SWITCH
A/D CONVERTER
(M52758FP)
(CXA3516R)
SCALER
H
3
RGBHV 5
CLAMP_AD
SOG_OUT
RGB 3
MEMORY (6M-BYTE)
Buffer (74F574 x 4)
(JAG200)
PLLH/CLK 2
41P 8
4
H/V SOG
H/V/DE/CLK V H
CVBS
RGB 3
YCbCr/ YPbPr
(VPC3230D)
5 H/V/ FIELD/ LLC1 4
2
DISP_EN
H/V 2
COLOR DECODER
RGBHV DEINTERLACE (FLI2200)
H
ENHANCER (FLI2220)
COLOR CONTROL & VIDEO SWITCH
5
YUV
H/V/CLK/ HBLK/VBLK MEMORY (4M-BYTE)
H/V 2
Y,U,V,H,V
V
EPLD (GEN. CLAMP)
Clamp
(CXA2101Q)
5
Y,Pb,Pr(MNT) 3 Y,Pb,Pr(STB) 3
AUDIO R
L
AUDIO AMP LA4282(L&R)
Sound Processor (MSP3401G)
(74HCT373)
MICOM
ROM (AT29C010)
11/79
PORT EXP (M62320X3)
EEPROM X2416P
LG Electronics/DND QA Gr
RN-BA11(Tuner Receiver) Block - Diagram
Ro
L/R
PC
Lo MSP3401G 2’nd SiF TUNER.1
TUNER.2
Sound Processor
TV (M)
M52758FP RGB/YUV S/W
L/R
L/R(tv) TV (S)
RGB(PC)
RGB (DTV)
L/R(tv)
M52756FP CVBS Y,Pb,Pr(DTV)
VPC3230D (SUB) Video Proessor
Y/C
S-VHS
Y/C
CXA2069Q
※ AUDIO 공용
외부입력 1
OPTION
RGB
RGB/YUV S/W
RGB(OSD)
CXA2119M
YUV
S/W
Y/C V, L/R
A/V SW
CVBS
DCF WE
MS81V04160 외부입력 2
V, L/R
Y/C DVD_Y
MNT_OUT
RE
VPC3230D
FRAME MEMORY
(MAIN) LGTV1001 DRP
Vido Proessor
+
Y,Cr,Cb (DVD)
DVD/DTV
Y,Pb,Pr(DTV)
(RCA JACK)
12/79
LG Electronics/DND QA Gr
Product back & monitor in/output section
13/79
Connecting 25 Pin cable (when connecting 25 Pin cable, Connect external equipment to STB) LG Electronics/DND QA Gr
Connection diagram (back cover’s open)
Controller Board
Z-Board Power Board
Y-Drive (TOP)
VSC Board Y-Board
EMI Filter
Y-Drive (Bottom)
14/79
LG Electronics/DND QA Gr
Exploded view (Back Cover, VSC, EMI, Power )
VSC BOARD
EMI Filter
POWER BOARD
BACK COVER
15/79
LG Electronics/DND QA Gr
Exploded view (Module)
CONTROL BOARD
Z-BOARD Y-Drive BOARD
Y-Drive BOARD
X-BOARD X-BOARD Y-BOARD
16/79
LG Electronics/DND QA Gr
Parts (back covers open)
Y-Drive Board (Top)
Y-Board
Y-Drive Board
Control Board(Back)
VSC Board(Front)
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Power Board
EMI Filter
Z- Board
Main Power Switch
LG Electronics/DND QA Gr
EMI Filter & VSC Board are separated Y-Drive Board
Y-Board
Control Board
Z-Board
X-Board ( Right)
X-Board ( Left )
18/79
LG Electronics/DND QA Gr
Power Board ( SMPS )
Power well power Board-Korean market
Murata Power Board
19/79
LG Electronics/DND QA Gr
Ⅲ. Screen defect diagnosis 1. The 4/7 or 3/7 of screen is not displayed. 1) Check the X B/D power connector. 2) Check the connector between CTRL B/D and X B/D. 3) Replace the X B/D.
※ relations between screen and X B/D screen left 4/7 of screen right 3/7 of screen
X B/D ↔ ↔
Right X B/D Left X B/D
※ type
i) screen’s left(4/7)
ii) Screen’s right(3/7)
Displaying part Non-displaying part
20/79
LG Electronics/DND QA Gr
2. No image by Data COF. (the case one Data COF is totally or partially not displayed included) 1) It is mainly caused by related Data COF and X B/D connection error. 2) Check the connector between that Data COF & X B/D. 3) When Data COF has a defect, replace the related X B/D.
※ examples of screen display type ( beside the below, any out of 7 Data COF can be occurred. )
ok partially displaying Non-image
※ Data COF IC test method Set ① pattern( GND ) to ANODE, ② Pattern (resistance t part ) to CATHOD, Test diode forward and backward. Measure ③ resistance value.(10Ω) ② resistance
① GND
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LG Electronics/DND QA Gr
3. Data COF IC unit error 1) As pictures below, this is caused by the clock error of Data COF IC 2) With
※ Cases
One IC error in one COF
Two every-second IC error in one
4 IC errors in one COF
22/79
LG Electronics/DND QA Gr
4. Regular vertical line with one or more Data COF IC 1) Regular vertical line with one Data COF IC is mainly caused by X B/D output terminal buffer’s output error. When two Data COF ICs have regular vertical lines, it means the data transfer from Controller B/D to X B/D has an error. 2) Check the related X B/D connector. 3) Replace that X B/D or CTRL B/D
※ relation between screen & X B/D
screen
※ case
X B/D
left 4/7 of bottom screen
↔
Right X B/D
right 3/7 of bottom screen
↔
Left X B/D
Partial error or total error with One or more ICs defect.
23/79
LG Electronics/DND QA Gr
5. The screen by Scan FFC is not displayed 1) It is mainly caused by the bad connection between Scan FFC & Y B/D. 2) Check the related connector between Scan COF & Y B/D. 3) When Scan IC has a defect, replace the related Y DRV B/D.
1/8 of the screen
※ case ● ● ●
OK total or partial non- image ※ SCAN IC check
Set Vpp Pin to ANODE, GND pin to CATHOD and test diode forward and backward.
24/79
LG Electronics/DND QA Gr
6. Regular vertical lines in the whole screen. (mainly in one specific color, regular line is flicking) 1) This problem is related to CONTROL B/D. 2) Replace CONTROL B/D
※case
Regular vertical lines in the whole screen
7. Vertical Data copy 1) It possibly happens when scan wave does not form properly. 2) Replace Y DRVB/D or Y SUS B/D
※ case
<pattern supposed to display>
25/79
8. One or more vertical lines in the screen. 1) Irregular vertical line is not related to Controller B/D or X B/D. 2) It is mainly caused by the followings open(or short). - itself defect - DATA COF FPC attached to is open or short. - DATA COF attached to itself defect 3) Replace module
※ case
There are several types. Several lines in ¼ area. It can be seen on the both side, right and left. The area is sometimes over ¼.
9. One or more horizontal lines in the screen. 1) Irregular borizontal line is not related to Controller B/D or Y B/D. 2) It is mainly caused by the followings open(or short). - itself defect - SCAN FPC attached to is open or short. - SCAN IC attached to itself defect 3) Replace Y DRV B/D
※ case Not always like this. There can be several horizontal lines
26/79
LG Electronics/DND QA Gr
10. Input signal pattern is displayed but the whole brightness of the screen is dark. 1) It happens when Z B/D is not operating well. 2) Check whether Z B/D’s power connector is plugged . 3) Check whether the connector between Controller B/D & Z B/D is plugged. 4) Replace Controller B/D or Z B/D.
11. In full white pattern, foreign color is displayed or in full black pattern, mis-discharge is partially occurred. 1) Check the slope of Y B/D set up, set down waveform. 2) Check the slope of Z B/D’s ramp waveform 3) Measure each B/D’s output waveform by over 200MHz oscilloscope and compare it to the below picture. it is possible to control Y B/D’s setup slope by adjustinng VR2, setdown slope by VR1 and Z B/D’s ramp slope by VR1.. - Y B/D measurement point : TP ( Connector P4 36 pin ) - Z B/D measurement point : connection part ( SUS_OUT )
230V Vsetup 175V Vs 0V
175V Vs
setup 25µs
15µs
20µs
setdown 230µs
Z RAMP voltage wave
Y output voltage wave
27/79
LG Electronics/DND QA Gr
12. In full white pattern, the brightness is getting darker toward the center. 1) It happens with Z B/D’s ramp waveform 2) Check the connection between CTRL B/D and Z B/D’s connection cable. 3) Replace Z B/D.
※ case
13. A specific brightness of one color is not clear. 1) Check CTRL B/D’s input signal connector. 2) Replace CTRL B/D.
28/79
LG Electronics/DND QA Gr
Ⅳ. Non-picture Defect diagnosis. Non- image or same symptom when power off or black pattern. 1) Check CTRL B/D’s LED(D1~D4). 2) Check the power or signal cable input into CTRL B/D. 3) Check X B/D, Y B/D and Z B/D’s power connector. 4) Check the connector between CTRL B/D and X B/D, Y B/D, Z B/D respectively. 5) Measure each X, Y, Z B/D’s output waveform with over 200MHz oscilloscope and compare it to the below picture to detect the defect and replace that. - Y B/D measurement point : TP ( Connector P4 36 pin ) - Z B/D measurement point : connection part ( SUS_OUT ) - X B/D measurement point : L1(RIGHT), L2(LEFT BOTTOM) 6)Test scan(Y) IC. 7)Test data(X) COF IC 8)Replace CTRL B/D.
1Frame(16.7ms) 5) Test scan(Y) IC. 6) Test data(X) COF IC. 7) Replace CTRL B/D.
< A: Y B/D output waveform - 1 FRAME > < B: Y B/D output waveform - 1 SF > < B: Y B/D output waveform - 2 SF(non-Setup SF) >
29/79
LG Electronics/DND QA Gr
< A: Y B/D output waveform - 1Frame > < B: Y B/D output waveform - 7~12 SF(SE) >
< A: Z B/D output waveform - 1Frame >
< B: Z B/D output waveform - 1SF >
< X B/D output waveform - 1 FRAME > < X B/D output waveform - 1 SF > < X B/D output waveform - amplification >
30/79
LG Electronics/DND QA Gr
Ⅴ. One Point Service Guide
42 Inch
42” PDP Flicker and No Raster Troubleshooting Guide cause : bad connection between Y-Board # 1, 2 drive board Connector pin
P6 Rework should be done P4 Y-Driver Board
Y-Board 31/79
LG Electronics/DND QA Gr
② ②
①
P4
P6 ② ①
①
② ①
amplified
amplified ① : outside Leg ② : inside Leg
①
•P 6, P 4 both are the first pin, when wiring, it should be done as picture shown. (bend the wire to Y-Driver B/D not to Y-B/D . If not there can be noise)
②
①
②
•Don’t be confused with Pin number •Improved since Dec,2001.
32/79
LG Electronics/DND QA Gr
①
① ②
②
②
① ②
①
Be sure not to misconnect the line. See the picture precisely and then connect jump wire at the exact point
33/79
LG Electronics/DND QA Gr
Intermittent no-image/image error while watching X CANVAS
X CAVBAS
The screen is intermittently disappeared . LED is green
screen is distorted weiderly (happened 2 a day)
X CANVAS cause : bad connection between Y-Board and #1, 2 pin of Y-Drive Board Connector
troubleshooting : connect bad linking between Y-Board & Y-Drive with jump wire (all 4 parts) see working instruction(revised since Dec,2001. 1) 34/79
normal
LG Electronics/DND QA Gr
No Power X CANVAS
X CANVAS
No Power ( in ST-BY mode, but no LED)
normal
Check the power supply & main power S/W on Check EMI board fuse (check the rated capacity )
Be sure to use rated fuse. Fuse 15 A
35/79
LG Electronics/DND QA Gr
No Raster X CAVBAS
X CANVAS
when Power’s on, after 2 ~ 3 sec, it’s off ( LED changing green into red )
normal
CHECK : remove STB and operate monitor individually. (check STB defect or Monitor defect ) When using ANALOG STB, check STB only MN-42PZ10 only STB : RN-BA11 Remove each Board’s power supply connector and check the power is off. When the power is not off,replace the related board.
36/79
LG Electronics/DND QA Gr
No Picture X CANVAS
X CANVAS
no picture (LED’s green)
normal
Core checkpoint : remove STB and operate monitor individually. (check whether STB’s a defect or monitor’s one) With monitor defect, check VSC and then Controller Board. Troubleshooting : replace VSC Board
37/79
LG Electronics/DND QA Gr
Address Bar ( Horizontal Bar ) X CANVAS
X CANVAS
no image (LED’s green)
normal
Cause : Y-Drive ( Bottom ) defect Troubleshooting : Y-Drive (lower part) replacement This problem is shown in the bottom of screen, So it is caused by Y-Drive
Y-Drive Board ( Bottom ) 38/79
LG Electronics/DND QA Gr
Address Bar ( Horizontal Bar ) X CANVAS
X CANVAS
no image (LED’s green)
normal
Y-Drive Board ( Top ) Cause : Y-Drive Board (upper part) defect Troubleshooting : Y-Drive Board replacement
39/79
LG Electronics/DND QA Gr
No Picture X CANVAS
X CANVAS
no image (LED’s green)
normal PD501 Connector
cause : PD-501 Connector point defect troubleshooting : PD-501 Connector replacement (with PD-501 Connector point defect, Various defect symptoms can be seen)
40/79
LG Electronics/DND QA Gr
High frequency noise (“Bee” sound) X CANVAS
X CANVAS
normal picture with high frequency noise (“bee”)
normal
SMPS is supposed to operate with high frequency so small noise is not considered as a defect. Power (SMPS) Board 1. C8178 0.22 ㎌ /50V add 2. Open C8139 right lead, and then connect it to R8164 right lead. Improved since Nov,2001
C8178 0.22uF electrolytic capacitor insertion
#. Slight noise is not a defect and write down explanation
41/79
Open C8139 right lead and then wire R8164 right lead LG Electronics/DND QA Gr
No picture in right- 2/5 area X CANVAS
X CANVAS
normal
No picture in the right- 2/5 area
X-Board ( Left ) power supply check X-Board ( Left )Connector check X-Board ( Left ) replacement
42/79
LG Electronics/DND QA Gr
Address Bar (Vertical ) X CANVAS
X CANVAS
normal
stripe in right-2/5 area X-Board ( Left ) power supply check X-Board ( Left ) Connector check X-Board ( Left ) replacement
43/79
LG Electronics/DND QA Gr
No picture in left 3/5 of the screen X CANVAS
X CANVAS
normal
left 3/5 of screen with vertical stripes
X-Board ( Right ) power supply check X-Board ( Right )Connector check X-Board ( Right ) replacement
44/79
LG Electronics/DND QA Gr
Address Bar (Vertical ) X CANVAS
X CANVAS
normal
left 3/5 of screen with vertical stripes.
X-Board ( Right ) power supply check X-Board ( Right )Connector check X-Board ( Right ) replacement
45/79
LG Electronics/DND QA Gr
No Red X CANVAS
X CANVAS
no Red ( B or G )
normal
Test Monitor individually. If detect a problem with monitor, check VSC Board. If it has a problem with STB connecting, focus on 25 Pin. Be sure not to connect 5 Pin (AP-EA10) by force 25 Pin Cable P/No : GVZ AP-EA10
Be sure not to bend it by force or internal Insulated conductor can be down. 46/79
LG Electronics/DND QA Gr
1) X - Board COF Connector separation Lift up the right and left of X-BOARD CONNECTOR.
42 Inch Lift up X-BOARD CONNECTOR and separate COP CONNECTOR by pulling up.
When you handle COF CONNECTOR, don’t pressure. First release LOCK and separate. If COF CONNECTOR is damaged, you should replace MODULE ASS’Y. So, be aware of this!!
COF Connector
Warning When Whenyou youexchange exchangeX-Board, X-Board,first firstyou youshould shouldseparate separateCOF COF Connector. Be careful to handle it. Connector. Be careful to handle it. COF COFConnector Connectorisisattached attachedto to Module. Module.When WhenCOF COFConnector Connectorisis broken, Module ASS’Y must be replaced a new one. broken, Module ASS’Y must be replaced a new one.
47/79
LG Electronics/DND QA Gr
2) X - Board Connector separation
Lift up each edge of left/right.
Lifted condition Be careful to handle LOCK or it can be broken. When LOCK is broken, replace a new X-BOARD.
Warning It’s easy to separate it by releasing Connector Lock . Do not pressure or it can be hurt. When LOCK is hurt, replace a new X-BOARD
48/79
LG Electronics/DND QA Gr
3) Y - Board COF Connector separation
Pull the white LOCK as shown in arrow
Pull the white LOCK as shown in arrow.
Separate COF CONNECTOR by pulling in the left. Warning Be careful to handle LOCK and COF Connector. When LOCK part is damaged, you should replace a new Y-Board. In case of COF Connector, Module Assembly.
49/79
LG Electronics/DND QA Gr
4) Z - Board COF Connector separation
Separate the fixed Screw of Z-Board. Pull out Lock as shown in arrow.
Condition in Lock part is pulled
COF Connector
Warning Be careful not to tear COF Connector. If COF Connector is torn, replace a new Module Assembly
50/79
Pull COF Connector as shown in arrow. It’s easy to separate COF on condition that Z-Board Screw is separated. In case Z-Board is assembled, it’s really hard to separate.
LG Electronics/DND QA Gr
5) Connector separation Guide Push LOCK and pull out PUSH
PUSH
PUSH
PUSH
PUSH
51/79
PULL
LG Electronics/DND QA Gr
6) Control Board & VSC Board Connector
52/79
LG Electronics/DND QA Gr
7) Gas injection (Sealing up) condition
Be sealed up after gas injection
Be sealed up after gas injection
Warning
Be careful to handle the sealed-up part after gas injection. If it is broken, the gas escapes. So, replace the Module.
53/79
LG Electronics/DND QA Gr
8) Power off in 2 ~ 3 minutes(Protection) Power PowerisisOn Onand andoff off2~3 2~3minutes. minutes. (Protection) (Protection) OK
P301 P301Connector ConnectorOpen Open Check. Check.
XX--Board BoardTop TopRight Right Change. Change. OK
P302 P302Connector ConnectorOpen Open Check Check
XX--Board BoardTop TopLeft Left Change. Change. OK
P303 P303Connector ConnectorOpen Open Check Check
P304 P304Connector ConnectorOpen Open Check Check
XX--Board BoardBottom BottomRight Right Change. Change. OK
P102 P102Connector ConnectorOpen Open Check Check
XX--Board BoardBottom BottomLeft Left Change. Change. OK
P3, P3,P2 P2Connector ConnectorOpen Open Check Check
ZZ--Board Board Change. Change. OK
P005, P005,P003 P003Connector ConnectorOpen Open Check Check PROTECT PROTECT operation; operation;
P006 P006Connector ConnectorOpen Open Check Check
When When the the load load voltage voltage is is short. short. When When each each voltage doesn’t doesn’t work work (in (in general) general)
YY--Board Board Change. Change. OK
VSCVSC-Board Board Change. Change. OK
VSC VSC--Board Board Change. Change. Sound Output IC Short Sound Output IC ShortCheck Check
Power Power Board Board Change Change
54/79
LG Electronics/DND QA Gr
9) Power off in 2 ~ 3 minutes(Protection)
L813 Cold Solder
Symptom : As soon as the power on, it’s off in 2 - 3minutes. (PROTECT operation) Cause : No VS voltage L813 Coil cold soldering.
Check Check Open the Connector connecting to each Board to check the power is off. if each Board is same, check the Power Board and voltage.
55/79
LG Electronics/DND QA Gr
10) ADD BAR inspection and repair
Press the ADJ KEY and check the position of add bar by changing WHITE or RED or BLUE or GREEN
HEATRUN : WHITE
Top Right
Bottom Right
Top Left
Bottom Left
MP-40PA10 uses 4 board such as left,right, top and bottom. Divide the screen in 4 and once you see ADD BAR check COF CONNECTOR between MODULE and X-BOARD. If there is no defect in COF CONNECTOR replace X-BOARD. But the problem still remains and check the connector between X-BOARD and CONTROL BOARD. And if you can’t find defect, check CONTROL.
56/79
LG Electronics/DND QA Gr
11) One Point Service Guide
Symptom : B color 1 Address line Open Cause : Dented COF
COF is dented
57/79
LG Electronics/DND QA Gr
Symptom : Inferior R Address color Cause : Inferior DATA output by cold soldering 16 pin of IC14 in X-L-TOP ( Normal waveform after tearing off IC Pin) Countermeasure : Replace X-L-TOP board.
IC14
Cold Soldering
Abnormal waveform by cold soldering Normal waveform after tearing off IC pin
58/79
LG Electronics/DND QA Gr
Symptom
Causes
Countermeasure
If 15V line voltage reduces below 14V, Mis-discharge occurs and power off because of protection circuit.
Replace PSU (Power Supply Unit) and defective X-Board.
Defective X-Board
The blue spreads on the screen (Mis-discharge) and power off in 2 ~ 3 seconds. If you turn on again, it will be same problem. Check Check If when Power on, screen shows like above and turn off in 2 seconds, check if turning off or not by disconnecting all X & Y boards.
59/79
LG Electronics/DND QA Gr
Symptom
Cause
No 5V supply to Top right X-Board.
Countermeasure
Connect 5V line
The top left part of screen is broken (Top Right X-BOARD)
Check Check Check Top right X-BOARD 5V.(If 0V, it happens) Check 5V line from SMPS to X-BOARD.
60/79
LG Electronics/DND QA Gr
Cause
Symptom
No Va(70V) supply to Top right X-Board.
Countermeasure
Connect 70V line
Pinkish screen in the top left. (Top right X-BOARD)
Check Check Check Top right X-BOARD Va(70V).(If 0V, it happens) Check 70V(Va) line from SMPS to X-BOARD.
61/79
LG Electronics/DND QA Gr
Cause
Symptom
Countermeasure
No 12V supply to Top right X-Board.
Connect 12V line
No Va(70V) supply to Top right X-Board.
Connect 70V line
The 3/5 top left in the screen is blank (Top Right X-BOARD) Check Check Check Top right X-BOARD 12V.( If 0V, it happens ) Check Top right X-BOARD Va(70V).(If 0V, it happens) Check 12V & 70V(Va) line from SMPS to X-BOARD.
62/79
LG Electronics/DND QA Gr
Cause
Symptom
Countermeasure
No 12V supply to Top left X-Board.
Connect 12V line
No Va(70V) supply to Top left X-Board.
Connect 70V line
The 3/5 top right of the screen is blank. (Top left X-BOARD) Check Check Check Top left X-BOARD 12V.( If 0V, it happens ) Check Top left X-BOARD Va(70V).(If 0V, it happens) Check 12V & Va(70V) line from SMPS to X-BOARD.
63/79
LG Electronics/DND QA Gr
Cause
Countermeasure
P1 COF connector on Top left X-Board is open.
Reassemble it
Symptom
Pinkish screen in the 1/5 top right (Top left X-BOARD)
Check Check Check the point and Locking of P1 on Top left X-BOARD.
64/79
LG Electronics/DND QA Gr
Symptom
Cause
No 5V supply to bottom right X-Board.
Countermeasure
Connect 5V line
The 3/5 bottom left of screen is broken. (BOTTOM RIGHT X-BOARD)
Check Check Check Bottom right X-BOARD 5V.( If 0V, it happens ) Check 5V line from SMPS to X-BOARD.
65/79
LG Electronics/DND QA Gr
Cause
Symptom
No 12V supply to bottom right X-Board.
Countermeasure
Connect 12V line
No Va(70V) supply to bottom right X-Board.
The 3/5 bottom left of the screen is Blank. (Bottom Right X-BOARD)
Check Check Check Bottom right X-BOARD 12V.( If 0V, it happens ) Check 12V line from SMPS to X-BOARD.
66/79
LG Electronics/DND QA Gr
Symptom
Cause
No 5V supply to bottom left X-Board.
Countermeasure
Connect 5V line
The 2/5 right of the screen is broken. (Bottom left X-BOARD)
Check Check Check Bottom left X-BOARD 5V.( If 0V, it happens ) Check 5V line from SMPS to X-BOARD.
67/79
LG Electronics/DND QA Gr
Cause
Symptom
No 12V supply to bottom left X-Board.
Countermeasure
Connect 12V line
The 2/5 right part of the screen is blank. (Bottom left X-BOARD )
Check Check Check Bottom left X-BOARD 12V.( If 0V, it happens ) Check 12V line from SMPS to X-BOARD.
68/79
LG Electronics/DND QA Gr
Cause
Countermeasure
The connecting of X-Board bottom left connector is bad.
Reassemble it.
Symptom
ADDRESS bar appears in the right bottom of the screen. (X-BOARD BOTTOM LEFT)
Check Check Check connecting of the connector of bottom left X-BOARD. Reassemble it. X-BOARD BOTTOM LEFT CONNECTOR OPEN.
69/79
LG Electronics/DND QA Gr
Examples
70/79
LG Electronics/DND QA Gr
Symptom
Cause
Connector(P13) is OPEN or Connecting condition is bad
Countermeasure
Reassemble P13.
Screen is divided in top and bottom, and vertical bar appears.
Check Check P13 CONNECTOR point inferior CHECK. P13 CONNECTOR SIGNAL CHEK. P13 CONNECTOR
71/79
LG Electronics/DND QA Gr
Symptom
Cause
VSC Board Connector is Open.
Countermeasure
Reassemble VSC Board Connector
Screen is broken and has the vertical/horizontal bar.
Check Check Check the connector connecting Reassemble the Connector
72/79
LG Electronics/DND QA Gr
Symptom
Cause
Loose VSC Board Connector
Countermeasure
Reassemble VSC BOARD Connector
The screen is bluish(Mosaic screen)
Check Check Check the connection condition of the Connector. Reassemble the Connector.
73/79
LG Electronics/DND QA Gr
Symptom
Cause
Countermeasure
Bad IC203
Replace IC203(VPC3230D)
The mosaic appears in the screen when it connects to VIDEO Input. (The sensibility of Y-signal is low.) When connected to Component Input, it is O.K.
Check Check
Check if X201 on VSC board oscillates. Check Video In/Out of IC203 on VSC board. IC201 (VPC3230D) Decoder IC 74/79
LG Electronics/DND QA Gr
Examples
IC201(VPC3230D) Decoder is inferior 75/79
LG Electronics/DND QA Gr
Cause Countermeasure
Symptom
Bad Connector connecting Control Board and VSC B/D.
Change the Connector
Abnormal
Normal
Noise with division of colors
Check Check point and signal condition of Connector Control Board and VSC Board.
Bad Connector 76/79
LG Electronics/DND QA Gr
Name
No signal Vertical Bar Symptom
Cause and Countermeasure 1.Cause : Bad IC2 (DA1) ▶ IC2 DA1(Data Arrange) No.162 Pin output is changing depending on the temperature.⇒ abnormal X-B’d Buffer IC * Room temperature : 2.5V Output (Normal Pin = over 2.8V) * Heated : 1.5V Output(Normal Pin = 2.7V ) ⇒ Bad IC2 (DA1) 2. Countermeasure : Replace IC2 < Waveform of normal pin> ─ heated
8cm
Realization
< Waveform of abnormal pin > ─ heated
DA1
DA1
Buffer
Buffer
When ASIC Chip(IC2 DA1 LGD4001) on Control Board gets high temperature, you can observe it (In normal temperature it’s O.K. ) Buffer(74ACT541) waveform abnormally narrows. →In this case, it is impossible for Flip Flop(74AC574) on X B/D to read data.
77/79
LG Electronics/DND QA Gr
Name
Add Open (Green 1 Line) Symptom
Cause and Countermeasure 1.cause: Add. COF Drive IC inferior
Add. COF Drive IC
Normal Line Data waveform
Open Line Data output waveform
▶ the output of inferior line less than that of the normal Line Add. COF Drive IC inferior ▶ COF inspection 검사기 : 24V Open check (normal 50V)
78/79
LG Electronics/DND QA Gr
Name
Vertical bar when Power off/on(Mis-discharge) Symptom
Cause and Countermeasure 1.Cause : Control board malfunctions when Power off/on. 2.Countermeasure: Change some parts on Control board. 3.Changing parts : A32_CTRL_03 B/D (Marked on PCB) -.R14,17,18,21 : 330 ==> 4.7K (Chip Resistor) -.R15,16,19,20 : 22K ==> 4.7K (Chip Resistor) -.C504, 505 : 0.1uF / 50V add (Chip Capacitor) Control board
Realization 1.PDP Power on Mode external input (regardless of wire/wireless signal but it’s easy to reenact in wireless signal) 2. Remove Power Cord (Power’s off) 3.after about 20minutes, insert Power cord (automatically the Power’s on and the vertical bar is shown as above)
79/79
LG Electronics/DND QA Gr
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