LG MN-42PZ10 Training Manual Download Page 74

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LG El

/DND QA

LG El

/DND QA

LG El

/DND QA

LG El

/DND QA Gr

Check

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.

Bad IC203

Replace IC203(VPC3230D)

Check if X201 on VSC board oscillates.
Check Video In/Out of IC203 on VSC board.

IC201

(VPC3230D)
Decoder IC

Symptom

Cause

Countermeasure

Summary of Contents for MN-42PZ10

Page 1: ...42 42 42 42 Inch Wide Inch Wide Inch Wide Inch Wide PDP SVC Training Manual PDP SVC Training Manual PDP SVC Training Manual PDP SVC Training Manual LG Electronics DND QA ...

Page 2: ...isplayed 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 mis discharge is partially occurred 12 In full white pattern the brightness is getting darker toward t...

Page 3: ...s 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 Gla...

Page 4: ...ng 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 ...

Page 5: ...50 1 w o filter 700 1 color temperature over 8500 color temperature over 8500 color temperature over 8500 color temperature over 8500 K K K K viewing angle over 160 viewing angle over 160 viewing angle over 160 viewing angle over 160 input signal NTSC HD VGA SVGA input signal NTSC HD VGA SVGA input signal NTSC HD VGA SVGA input signal NTSC HD VGA SVGA Twin Picture PC AV Twin Picture PC AV Twin Pic...

Page 6: ...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 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 Dig...

Page 7: ...sed 40X3M can be used SET TOP BOX SET TOP BOX SET TOP BOX SET TOP BOX Compatible Model Compatible Model Compatible Model Compatible Model Only related model can be used Only related model can be used Only related model can be used Only related model can be used Only related model can be used Only related model can be used Only related model can be used Only related model can be used all Model can ...

Page 8: ... 6871QZH002B PWB PCB ASSY ZSUS B D ASSY 3 6871QTH004B PWB PCB ASSY ZCNT BOTTOM B D ASSY 4 6871QLH012A PWB PCB ASSY X LEFT BOTTOM B D ASSY 5 6871QRH010A PWB PCB ASSY X RIGHT BOTTOM B D ASSY 6 6871QDP016B PWB PCB ASSY YDRV Upper B D ASSY 7 6871QDP017B PWB PCB ASSY YDRV Lower B D ASSY 8 6871QYH015A PWB PCB ASSY YSUS B D ASSY YDRV B D ASSY ZCNT TOP B D ASSY ZCNT BOTTOM B D ASSY EXTERNAL CABLE CONNECTI...

Page 9: ...rd Board Board Board CN1 CN1 CN1 CN1 CN2 CN2 CN2 CN2 Local key Local key Local key Local key EMI Filter EMI Filter EMI Filter EMI Filter VSC VSC VSC VSC Board Board Board Board POWER POWER POWER POWER Board Board Board Board X X X X Board R Board R Board R Board R X X X X Board L Board L Board L Board L Y Y Y Y Drive Drive Drive Drive Y Y Y Y Drive Drive Drive Drive Main Power Main Power Main Powe...

Page 10: ...1 THS8083 THS8083 THS8083 THS8083 THS8083 THS8083 THS8083 THS8083 CXA2022S CXA2022S CXA2022S CXA2022S CXA2022S CXA2022S CXA2022S CXA2022S MX88L284 MX88L284 MX88L284 MX88L284 MX88L284 MX88L284 MX88L284 MX88L284 Buffer Buffer Buffer Buffer HC541 HC541 HC541 HC541 Buffer Buffer Buffer Buffer HC541 HC541 HC541 HC541 LA4282 LA4282 LA4282 LA4282 LA4282 LA4282 LA4282 LA4282 MICOM MICOM MICOM MICOM CXP750...

Page 11: ...NCER FLI2220 COLOR CONTROL VIDEO SWITCH CXA2101Q 3 Y Pb Pr STB 3 Y Pb Pr MNT A D CONVERTER CXA3516R SCALER JAG200 MEMORY 6M BYTE EPLD GEN CLAMP Buffer 74F574 x 4 H V Clamp 2 H V H H V 2 PLLH CLK 5 H V CLK HBLK VBLK 4 H V DE CLK DISP_EN 5 RGBHV 3 RGB 3 RGB 5 Y U V H V Sound Processor MSP3401G 2 H V MONOSTALE MULTIBIB SOG_OUT CLAMP_AD PORT EXP M62320X3 ROM AT29C010 74HCT373 YCbCr YPbPr CVBS 2 YUV 41...

Page 12: ...tv DVD DTV RCA JACK VPC3230D MAIN Vido Proessor Y Cr Cb DVD DVD_Y VPC3230D SUB Video Proessor MS81V04160 FRAME MEMORY PC L R Y Pb Pr DTV Y Pb Pr DTV RGB PC CVBS RGB M52758FP RGB YUV S W DCF RE WE RN BA11 Tuner Receiver Block Diagram RN BA11 Tuner Receiver Block Diagram Ro Lo Y C 외부입력 외부입력 외부입력 외부입력2 MNT_OUT CVBS Y C OPTION TUNER 2 TV M TV S L R tv Y C M52756FP RGB YUV S W RGB DTV RGB OSD LGTV1001 ...

Page 13: ...connecting 25 Pin cable when connecting 25 Pin cable when connecting 25 Pin cable when connecting 25 Pin cable Connect external equipment to STB Connect external equipment to STB Connect external equipment to STB Connect external equipment to STB Product back monitor in output section Product back monitor in output section Product back monitor in output section Product back monitor in output secti...

Page 14: ... Board Board Board VSC Board VSC Board VSC Board VSC Board Y Y Y Y Drive Bottom Drive Bottom Drive Bottom Drive Bottom Z Z Z Z Board Board Board Board Controller Board Controller Board Controller Board Controller Board EMI Filter EMI Filter EMI Filter EMI Filter Connection diagram back cover Connection diagram back cover Connection diagram back cover Connection diagram back cover s open s open s o...

Page 15: ... COVER BACK COVER BACK COVER POWER BOARD POWER BOARD POWER BOARD POWER BOARD VSC BOARD VSC BOARD VSC BOARD VSC BOARD EMI Filter EMI Filter EMI Filter EMI Filter Exploded view Back Cover VSC EMI Power Exploded view Back Cover VSC EMI Power Exploded view Back Cover VSC EMI Power Exploded view Back Cover VSC EMI Power ...

Page 16: ...OARD Z Z Z Z BOARD BOARD BOARD BOARD CONTROL CONTROL CONTROL CONTROL BOARD BOARD BOARD BOARD X X X X BOARD BOARD BOARD BOARD X X X X BOARD BOARD BOARD BOARD Y Y Y Y Drive BOARD Drive BOARD Drive BOARD Drive BOARD Y Y Y Y Drive BOARD Drive BOARD Drive BOARD Drive BOARD Exploded view Module Exploded view Module Exploded view Module Exploded view Module ...

Page 17: ... Power Board Z Z Z Z Board Board Board Board Y Y Y Y Board Board Board Board Control Board Back Control Board Back Control Board Back Control Board Back Y Y Y Y Drive Board Top Drive Board Top Drive Board Top Drive Board Top Y Y Y Y Drive Board Drive Board Drive Board Drive Board Main Power Main Power Main Power Main Power Switch Switch Switch Switch Parts back covers open Parts back covers open P...

Page 18: ... X Board Left Board Left Board Left Board Left Control Board Control Board Control Board Control Board Z Z Z Z Board Board Board Board Y Y Y Y Board Board Board Board Y Y Y Y Drive Board Drive Board Drive Board Drive Board EMI Filter VSC Board are separated EMI Filter VSC Board are separated EMI Filter VSC Board are separated EMI Filter VSC Board are separated ...

Page 19: ...ics DND QA LG Electronics DND QA LG Electronics DND QA LG Electronics DND QA Gr Gr Gr Gr Power well power Board Korean market Murata Power Board Power Board SMPS Power Board SMPS Power Board SMPS Power Board SMPS ...

Page 20: ...isplayed 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 X B D left 4 7 of screen Right X B D right 3 7 of screen Left X B D type i screen s left 4 7 ii Screen s right 3 7 Non displaying part Displaying part Ⅲ Ⅲ Ⅲ Ⅲ Screen defect diagnosis ...

Page 21: ...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 partially displaying ok Non image Set pattern GND to ANODE Pattern resistance joint part to CATHOD Test diode forward and backward Measure resistance value 10Ω GND resistan...

Page 22: ...ata COF IC 2 With case 1 case 2 case 3 check Data COF connector and replace the X B D 3 With case 4 case 5 check the connector between CTRL B D X B D and replace X B D or CTRL B D Cases Two every second IC error in one case 1 4 IC errors in one COF case 2 Data COF IC unit error in the whole X B D case 3 Data COF IC unit error in the whole screen case 4 One IC error in one COF case 5 ...

Page 23: ... 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 screen X B D left 4 7 of bottom screen Right X B D right 3 7 of bottom screen Left X B D relation betw...

Page 24: ...t 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 case 1 8 of the screen total or partial non image SCAN IC check Set Vpp Pin to ANODE GND pin to CATHOD and test diode forward and backward OK ...

Page 25: ...lor 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 case2 partial top copy case 3 partial bottom copy case 4 total copy case 1 total copy ...

Page 26: ...TA COF attached to panel itself defect 3 Replace module case There are several types Several lines in area It can be seen on the both side right and left The area is sometimes over 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 Panel itself defect SCAN FPC attached to panel is ...

Page 27: ...n 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...

Page 28: ...cific brightness of one color is not clear 1 Check CTRL B D s input signal connector 2 Replace CTRL B D 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 ...

Page 29: ...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 panel connection part SUS_OUT X B D measurement point L1 RIGHT L2 LEFT BOTTOM A Y B D output waveform 1 FRAME B Y B D output waveform 1 SF 1Frame 16 7ms Ⅳ Ⅳ Ⅳ Ⅳ Non Non Non Non picture picture picture picture Defect diagnosis...

Page 30: ... DND QA LG Electronics DND QA Gr Gr Gr Gr B Y B D output waveform 7 12 SF SE B Z B D output waveform 1SF A Z B D output waveform 1Frame A Y B D output waveform 1Frame X B D output waveform 1 FRAME X B D output waveform amplification X B D output waveform 1 SF ...

Page 31: ...er and PDP Flicker and No Raster Troubleshooting No Raster Troubleshooting No Raster Troubleshooting No Raster Troubleshooting No Raster Troubleshooting No Raster Troubleshooting No Raster Troubleshooting No Raster Troubleshooting Guide Guide Guide Guide Guide Guide Guide Guide cause bad connection between Y Board 1 2 drive board Connector pin Ⅴ Ⅴ Ⅴ Ⅴ One Point Service Guide One Point Service Guid...

Page 32: ...ics DND QA Gr Gr Gr Gr amplified amplified outside Leg inside Leg 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 Don t be confused with Pin number Improved since Dec 2001 P 4 P 6 ...

Page 33: ... line Be sure not to misconnect the line Be sure not to misconnect the line See the picture precisely and then connect jump wire at the exac See the picture precisely and then connect jump wire at the exac See the picture precisely and then connect jump wire at the exac See the picture precisely and then connect jump wire at the exact point t point t point t point ...

Page 34: ...appened 2 a day normal normal normal normal cause bad connection between Y cause bad connection between Y cause bad connection between Y cause bad connection between Y Board and 1 2 pin of Board and 1 2 pin of Board and 1 2 pin of Board and 1 2 pin of Y Y Y Y Drive Board Connector Drive Board Connector Drive Board Connector Drive Board Connector troubleshooting connect bad linking between Y troubl...

Page 35: ... main power S W on Check the power supply main power S W on Check the power supply main power S W on Check the power supply main power S W on Check EMI board fuse check the rated capacity Check EMI board fuse check the rated capacity Check EMI board fuse check the rated capacity Check EMI board fuse check the rated capacity No Power No Power No Power No Power Fuse 15 A Fuse 15 A Fuse 15 A Fuse 15 ...

Page 36: ... Monitor defect check STB defect or Monitor defect check STB defect or Monitor defect When using ANALOG STB check STB only When using ANALOG STB check STB only When using ANALOG STB check STB only When using ANALOG STB check STB only MN MN MN MN 42PZ10 only STB RN 42PZ10 only STB RN 42PZ10 only STB RN 42PZ10 only STB RN BA11 BA11 BA11 BA11 Remove each Board Remove each Board Remove each Board Remo...

Page 37: ...t remove STB and operate monitor individually check whether check whether check whether check whether STB STB STB STB s s s s a defect or monitor a defect or monitor a defect or monitor a defect or monitor s one s one s one s one No Picture No Picture No Picture No Picture With monitor defect check VSC and then With monitor defect check VSC and then With monitor defect check VSC and then With moni...

Page 38: ...oting Y Drive lower part replacement Drive lower part replacement Drive lower part replacement Drive lower part replacement Address Bar Horizontal Bar Address Bar Horizontal Bar Address Bar Horizontal Bar Address Bar Horizontal Bar Y Y Y Y Drive Board Bottom Drive Board Bottom Drive Board Bottom Drive Board Bottom This problem is shown in the bottom of screen This problem is shown in the bottom of...

Page 39: ... Bar Horizontal Bar Address Bar Horizontal Bar Address Bar Horizontal Bar Y Y Y Y Drive Board Top Drive Board Top Drive Board Top Drive Board Top Cause Y Cause Y Cause Y Cause Y Drive Board upper part defect Drive Board upper part defect Drive Board upper part defect Drive Board upper part defect Troubleshooting Y Troubleshooting Y Troubleshooting Y Troubleshooting Y Drive Board replacement Drive ...

Page 40: ...fect 501 Connector contact point defect 501 Connector contact point defect 501 Connector contact point defect troubleshooting PD troubleshooting PD troubleshooting PD troubleshooting PD 501 Connector replacement 501 Connector replacement 501 Connector replacement 501 Connector replacement with PD with PD with PD with PD 501 Connector contact point defect 501 Connector contact point defect 501 Conn...

Page 41: ...d 2 Open C8139 right lead 2 Open C8139 right lead 2 Open C8139 right lead and then connect it to and then connect it to and then connect it to and then connect it to R8164 right lead R8164 right lead R8164 right lead R8164 right lead Improved since Nov 2001 Improved since Nov 2001 Improved since Nov 2001 Improved since Nov 2001 SMPS is supposed to operate SMPS is supposed to operate SMPS is suppos...

Page 42: ...ture in the right No picture in the right No picture in the right No picture in the right 2 5 area 2 5 area 2 5 area 2 5 area X X X X Board Left power supply check Board Left power supply check Board Left power supply check Board Left power supply check X X X X Board Left Connector check Board Left Connector check Board Left Connector check Board Left Connector check X X X X Board Left replacement...

Page 43: ... in right stripe in right stripe in right stripe in right 2 5 area 2 5 area 2 5 area 2 5 area X X X X Board Left power supply check Board Left power supply check Board Left power supply check Board Left power supply check X X X X Board Left Connector check Board Left Connector check Board Left Connector check Board Left Connector check X X X X Board Left replacement Board Left replacement Board Le...

Page 44: ...r check Board Right Connector check Board Right Connector check Board Right Connector check X X X X Board Right replacement Board Right replacement Board Right replacement Board Right replacement left 3 5 of screen with vertical stripes left 3 5 of screen with vertical stripes left 3 5 of screen with vertical stripes left 3 5 of screen with vertical stripes No picture in left 3 5 of the screen No ...

Page 45: ...eck X X X X Board Right Connector check Board Right Connector check Board Right Connector check Board Right Connector check X X X X Board Right replacement Board Right replacement Board Right replacement Board Right replacement Address Bar Vertical Address Bar Vertical Address Bar Vertical Address Bar Vertical left 3 5 of screen with vertical stripes left 3 5 of screen with vertical stripes left 3...

Page 46: ...lly Test Monitor individually If detect a problem with monitor check VSC Board If detect a problem with monitor check VSC Board If detect a problem with monitor check VSC Board If detect a problem with monitor check VSC Board If it has a problem with STB connecting focus on 25 Pin If it has a problem with STB connecting focus on 25 Pin If it has a problem with STB connecting focus on 25 Pin If it ...

Page 47: ...ld replace MODULE ASS Y So be aware of this 1 X Board COF Connector separation When you exchange X Board first you should separate COF Connector Be careful to handle it COF Connector is attached to Module When COF Connector is broken Module ASS Y must be replaced a new one When you exchange X Board first you should separate COF Connector Be careful to handle it COF Connector is attached to Module ...

Page 48: ... up each edge of left right Lifted condition 2 X Board Connector separation 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 Warning Warning Be careful to handle LOCK or it can be broken When LOCK is broken replace a new X BOARD ...

Page 49: ...e white LOCK as shown in arrow Pull the white LOCK as shown in arrow Separate COF CONNECTOR by pulling in the left 3 Y Board COF Connector separation Warning 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 ...

Page 50: ...f Z Board Pull out Lock as shown in arrow Condition in Lock part is pulled 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 Be careful not to tear COF Connector If COF Connector is torn replace a new Module Assembly Warning Warning COF Connector ...

Page 51: ...LG Electronics DND QA LG Electronics DND QA LG Electronics DND QA LG Electronics DND QA Gr Gr Gr Gr Push LOCK and pull out PUSH PUSH PUSH 5 Connector separation Guide PUSH PUSH PULL ...

Page 52: ...LG Electronics DND QA LG Electronics DND QA LG Electronics DND QA LG Electronics DND QA Gr Gr Gr Gr 6 Control Board VSC Board Connector ...

Page 53: ... LG Electronics DND QA Gr Gr Gr Gr Be sealed up after gas injection Be careful to handle the sealed up part after gas injection If it is broken the gas escapes So replace the Module 7 Gas injection Sealing up condition Warning Warning Be sealed up after gas injection ...

Page 54: ... X Board Bottom Right Change X Board Bottom Right Change X Board Bottom Left Change X Board Bottom Left Change Z Board Change Z Board Change P3 P2 Connector Open Check P3 P2 Connector Open Check Y Board Change Y Board Change P005 P003 Connector Open Check P005 P003 Connector Open Check P006 Connector Open Check P006 Connector Open Check VSC Board Change VSC Board Change VSC Board Change Sound Outp...

Page 55: ... Cold Solder 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 Symptom As soon as the power on it s off in 2 3minutes PROTECT operation Cause No VS voltage L813 Coil cold soldering 9 Power off in 2 3 minutes Protection ...

Page 56: ... 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 HEATRUN WHITE Press the ADJ KEY and check the position of add bar by changing WHITE or RED or BLUE or GREEN Top Right Top Left Bottom Right Bottom Left 10 ADD BAR inspectio...

Page 57: ...LG Electronics DND QA LG Electronics DND QA LG Electronics DND QA LG Electronics DND QA Gr Gr Gr Gr Symptom B color 1 Address line Open Cause Dented COF COF is dented 11 One Point Service Guide ...

Page 58: ...Gr Gr Gr 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 ...

Page 59: ...econds If you turn on again it will be same problem 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 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 Defective X Board ...

Page 60: ... QA LG Electronics DND QA Gr Gr Gr Gr Check Check The top left part of screen is broken Top Right X BOARD Symptom Cause Countermeasure No 5V supply to Top right X Board Connect 5V line Check Top right X BOARD 5V If 0V it happens Check 5V line from SMPS to X BOARD ...

Page 61: ... LG Electronics DND QA Gr Gr Gr Gr Check Check Pinkish screen in the top left Top right X BOARD Symptom Cause Countermeasure No Va 70V supply to Top right X Board Connect 70V line Check Top right X BOARD Va 70V If 0V it happens Check 70V Va line from SMPS to X BOARD ...

Page 62: ...top left in the screen is blank Top Right X BOARD Symptom Cause Countermeasure 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 No 12V supply to Top right X Board No Va 70V supply to Top right X Board Connect 12V line Connect 70V line ...

Page 63: ...5 top right of the screen is blank Top left X BOARD Symptom Cause Countermeasure No 12V supply to Top left X Board No Va 70V supply to Top left X Board Connect 12V line Connect 70V line 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 ...

Page 64: ...cs DND QA LG Electronics DND QA Gr Gr Gr Gr Check Check Pinkish screen in the 1 5 top right Top left X BOARD P1 COF connector on Top left X Board is open Reassemble it Check the contact point and Locking of P1 on Top left X BOARD Symptom Cause Countermeasure ...

Page 65: ...G Electronics DND QA Gr Gr Gr Gr Check Check The 3 5 bottom left of screen is broken BOTTOM RIGHT X BOARD Symptom Cause Countermeasure No 5V supply to bottom right X Board Connect 5V line Check Bottom right X BOARD 5V If 0V it happens Check 5V line from SMPS to X BOARD ...

Page 66: ...Gr Gr Gr Check Check The 3 5 bottom left of the screen is Blank Bottom Right X BOARD Symptom Cause Countermeasure Check Bottom right X BOARD 12V If 0V it happens Check 12V line from SMPS to X BOARD No 12V supply to bottom right X Board No Va 70V supply to bottom right X Board Connect 12V line ...

Page 67: ... LG Electronics DND QA Gr Gr Gr Gr Check Check The 2 5 right of the screen is broken Bottom left X BOARD Symptom Cause Countermeasure Check Bottom left X BOARD 5V If 0V it happens Check 5V line from SMPS to X BOARD No 5V supply to bottom left X Board Connect 5V line ...

Page 68: ...Electronics DND QA Gr Gr Gr Gr Check Check The 2 5 right part of the screen is blank Bottom left X BOARD No 12V supply to bottom left X Board Connect 12V line Check Bottom left X BOARD 12V If 0V it happens Check 12V line from SMPS to X BOARD Symptom Cause Countermeasure ...

Page 69: ...Gr Gr Check Check ADDRESS bar appears in the right bottom of the screen X BOARD BOTTOM LEFT The connecting of X Board bottom left connector is bad Reassemble it Check connecting of the connector of bottom left X BOARD Reassemble it X BOARD BOTTOM LEFT CONNECTOR OPEN Symptom Cause Countermeasure ...

Page 70: ...LG Electronics DND QA LG Electronics DND QA LG Electronics DND QA LG Electronics DND QA Gr Gr Gr Gr Examples Examples Examples Examples ...

Page 71: ...onics DND QA Gr Gr Gr Gr Check Check Screen is divided in top and bottom and vertical bar appears Connector P13 is OPEN or Connecting condition is bad Reassemble P13 P13 CONNECTOR contact point inferior CHECK P13 CONNECTOR SIGNAL CHEK P13 CONNECTOR Symptom Cause Countermeasure ...

Page 72: ...onics DND QA LG Electronics DND QA Gr Gr Gr Gr Check Check Screen is broken and has the vertical horizontal bar VSC Board Connector is Open Reassemble VSC Board Connector Check the connector connecting Reassemble the Connector Symptom Cause Countermeasure ...

Page 73: ...ronics DND QA LG Electronics DND QA Gr Gr Gr Gr Check Check The screen is bluish Mosaic screen Loose VSC Board Connector Reassemble VSC BOARD Connector Check the connection condition of the Connector Reassemble the Connector Symptom Cause Countermeasure ...

Page 74: ...k 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 Bad IC203 Replace IC203 VPC3230D Check if X201 on VSC board oscillates Check Video In Out of IC203 on VSC board IC201 VPC3230D Decoder IC Symptom Cause Countermeasure ...

Page 75: ...LG Electronics DND QA LG Electronics DND QA LG Electronics DND QA LG Electronics DND QA Gr Gr Gr Gr IC201 VPC3230D Decoder is inferior Examples Examples Examples Examples ...

Page 76: ...tronics DND QA Gr Gr Gr Gr Check Check Noise with division of colors Bad Connector connecting Control Board and VSC B D Contact point and signal condition of Connector Control Board and VSC Board Abnormal Normal Bad Connector Symptom Cause Countermeasure Change the Connector ...

Page 77: ... observe it In normal temperature it s O K 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 Waveform of normal pin heated Waveform of abnormal pin heated DA1 Buffer DA1 Buffer Buffer 74ACT541 waveform abnormally narrows In this case it is impossib...

Page 78: ... Name Add Open Green 1 Line Symptom Cause and Countermeasure 1 cause Add COF Drive IC inferior 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 inspection검사기 24V Open check normal 50V Add COF Drive IC ...

Page 79: ...al 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 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 C...

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