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LG 37LC6D, Service Manual

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LG 37LC6D Service Manual Download Page 37

 

Copyright © 2008 LG Electronics. Inc. All right reserved.                35                                        LGE Internal Use Only 
Only for training and service purposes 

35 

 

Step 5. Finally, FW is finished, please reset TV. 

 

 

 

 

 

 

5.2 No Video, No Backlight, No OSD 

 

After normal start, if no video or no backlight or no OSD happens, please follow trouble shooting steps below. 

 

Check Backlight

Check T-com 12V

Check LCD_ON Pin

Check Panel 

to U1 Path

Check

+24V

Change U1

Check

LCD_ON Path

D/L Fireware

Change 

Panel

Check LVDS 

Cable

Check

MB & PB 12V

Change Power Board

Change U1

 

 

 

Summary of Contents for 37LC6D

Page 1: ...I4 0M I4 0M I4 0M I4 0M I4 0M I4 0M I4 0M LCD TV SERVICE MANUAL CAUTION BEFORE SERVICING THE CHASSIS READ THE SAFETY PRECAUTIONS IN THIS MANUAL CHASSIS LA75C MODEL 37LC6D 37LC6D UM MODEL 37LG10 37LG10 UM North Latin America http aic lgservice com Europe Africa http eic lgservice com Asia Oceania http biz lgservice com Internal Use Only ...

Page 2: ...poses 1 Product Service Manual ZEN37US Content Index 1 PRODUCT OVERVIEW AND SPECIFICATIONS 2 2 MECHANICAL FUNCTION 9 3 FW DOWNLOAD METHOD 22 4 INTRODUCTION OF D L JIG FOR SUB MICRON 23 5 TROUBLE SHOOTING 33 6 ALIGNMENT 38 7 CIRCUIT DIAGRAM 47 8 EDID WRITE 66 9 SYSTEM BLOCK DIAGRAM 69 10 APPEARANCE INSPECTION 71 ...

Page 3: ...Copyright 2008 LG Electronics Inc All right reserved 2 LGE Internal Use Only Only for training and service purposes 2 1 PRODUCT OVERVIEW AND SPECIFICATIONS 1 1 SPECIFICATION ...

Page 4: ...Copyright 2008 LG Electronics Inc All right reserved 3 LGE Internal Use Only Only for training and service purposes 3 1 2 Panel Specifications ...

Page 5: ...Copyright 2008 LG Electronics Inc All right reserved 4 LGE Internal Use Only Only for training and service purposes 4 ...

Page 6: ...Copyright 2008 LG Electronics Inc All right reserved 5 LGE Internal Use Only Only for training and service purposes 5 ...

Page 7: ...Copyright 2008 LG Electronics Inc All right reserved 6 LGE Internal Use Only Only for training and service purposes 6 ...

Page 8: ...Copyright 2008 LG Electronics Inc All right reserved 7 LGE Internal Use Only Only for training and service purposes 7 ...

Page 9: ...Copyright 2008 LG Electronics Inc All right reserved 8 LGE Internal Use Only Only for training and service purposes 8 ...

Page 10: ...are identified by in the Schematic Diagram and EXPLODED VIEW It is essential that these special safety parts should be replaced with the same components as recommended in this manual to prevent X RADIATION Shock Fire or other Hazards Do not modify the original design without permission of manufacturer IMPORTANT SAFETY NOTICE Copyright LG Electronics Inc All right reserved Only for training and ser...

Page 11: ...0057301 5D 0GK07 011 OEM Qisda PSU Z37LC6D UM 540 EBU57524901 5E 0GL01 001 Main Total Assembly Z37LC6D UM ZENITH Qisda ODM MAIN ASSY 550 COV30059701 5K 0GL09 011 OEM Qisda AC socket Z37LC6D UM 551 MJH49414801 3D 0GK02 001 Supporter PRESS EGI 1 2T Supporter SECC EGI AC HOLDER 801 MGJ49418002 3K 0GL01 001 Plate Metal PRESS SECC 1 2T FRAME SECC METAL BAR TOP 802 MGJ49418902 3K 0GL02 001 Plate Metal P...

Page 12: ...served 10 LGE Internal Use Only Only for training and service purposes 10 2 2 DISASSEMBLY 2 2 1 Disassembly part Base Rear Cover Keypad BD IR BD Main BD Power BD Side AV BD Step1 Remove Base Step2 Remove Rear Cover Step3 Remove Keypad BD and IR BD ...

Page 13: ...8 LG Electronics Inc All right reserved 11 LGE Internal Use Only Only for training and service purposes 11 Step4 Remove Power BD Setp5 Remove Main TOP SHD Setp6 Remove Main BD Main BD BOM SHD Ground wire Ground wire ...

Page 14: ...ics Inc All right reserved 12 LGE Internal Use Only Only for training and service purposes 12 Step 7 Remove Side AV BD Step 8 Arrange the wire small cable clip short electric tape long electric tape big cable clip fireproof tape ...

Page 15: ...ht 2008 LG Electronics Inc All right reserved 13 LGE Internal Use Only Only for training and service purposes 13 2 2 2 Disassembly Part Speaker Step 1 Remove Base Step 2 Remove Rear Cover Step 3 Remove Speaker ...

Page 16: ...Copyright 2008 LG Electronics Inc All right reserved 14 LGE Internal Use Only Only for training and service purposes 14 2 2 3 Disassembly Part Bezel Panel Step1 Remove Base Step2 Remove Rear Cover ...

Page 17: ...Copyright 2008 LG Electronics Inc All right reserved 15 LGE Internal Use Only Only for training and service purposes 15 Step3 Remove Frame PCBA ...

Page 18: ... FRM DOWN FRM LEFT 1 FRM DOWN FRM V MID 1 FRM V MID FRM H TOP 1 FRM V MID FRM H DOWN 2 FRM RIGHT FRM H TOP 1 FRM RIGHT FRM H DOWN 2 STD HOLDER CVR FRM H DOWN 2 STD HOLDER CVR FRM DOWN 2 POWER BD FRM LEFT 2 POWER BD FRM V MID 2 FRM RIGHT SIDE BD 1 MAIN TOP SHD FRM H TOP 2 MAIN TOP SHD FRM H DOWN 2 SHELF AC FRM DOWN 1 SHELF AC AC 2 Back cover frm v mid 1 Back cover frm right 1 MAIN TOP SHD MAIN BOTT...

Page 19: ...24L EXT TOO B ZN NYL 4 8 10 neck frame 4 4 8F 00535 100 STAND OFF M2 7 12 8L S7 ZN 4 4 6 Main shd D SUB CONN 4 5 8f 00559 100 SCRW TAP FH M3 10L C ZN 16 6 8 Plt base base cover 8 PLASTIC NECK NECK SKELETON 8 6 8F EA226 130 SCRW TAP TRU M4 12L B ZN 5 8 10 Plastic neck plt base 5 7 8f SA324 8r0 SCRW TAP BIND M3 8L B ZN 2 4 6 hdmi connector cover 2 ...

Page 20: ...4 6 Connector cover AV connector 9 8F 00530 8R0 SCRW TAP TRU W EXT M4 8L ZN 1 6 8 AC FRM DOWN 10 8F 1G326 6R0 SCRW MACH PH W FL M4 6L B ZN 6 6 8 PANEL FRM RIGHT PANEL FRM LEFT 11 8F 1G326 140 SCRW MACH PH W FL M4 14L B Z 4 6 8 PANEL FRM TOP 2 PANEL FRM DOWN 2 12 8f UG324 120 SCRW TAP PH W FL PT M3 12L B Z 27 6 8 IR BD BEZELx1 Back cover bezel 11 FRM TOP bezel 2 ...

Page 21: ...All right reserved 19 LGE Internal Use Only Only for training and service purposes 19 FRM DOWN bezel 4 Stand cvr bezel 1 Connector cover back cover 4 Speaker COVER bezel 2 Stand cvr BACK COVER 2 Total Screw Type 12 Total Screw Q TY 115 ...

Page 22: ...Copyright 2008 LG Electronics Inc All right reserved 20 LGE Internal Use Only Only for training and service purposes 20 2 4 OPERATION FOR PACKING ...

Page 23: ...Copyright 2008 LG Electronics Inc All right reserved 21 LGE Internal Use Only Only for training and service purposes 21 ...

Page 24: ...ning and service purposes 22 3 FW Download Method Procedure of USB Download Service Only App code This method will update application code only Step 1 Plug in USB with LG ECC file in root directory Step 2 USB Downloading appears on TV screen Step 3 Download finished Remove USB and restart TV ...

Page 25: ...c All right reserved 23 LGE Internal Use Only Only for training and service purposes 23 4 Introduction of D L jig for Sub Micron USB to I2C D L PCBA To TV set To Computer USB type A to type A cable D sub 15 male to D sub 15 male cable ...

Page 26: ...served 24 LGE Internal Use Only Only for training and service purposes 24 Included D L Included USB driver of D L Step 2 Install execution file of D L Step 1 connect D L board to USB port Install USB driver of D L board D L procedure for Sub Micron ...

Page 27: ...Copyright 2008 LG Electronics Inc All right reserved 25 LGE Internal Use Only Only for training and service purposes 25 Step 3 Execute D L program Step 4 Press ...

Page 28: ...Copyright 2008 LG Electronics Inc All right reserved 26 LGE Internal Use Only Only for training and service purposes 26 Step 5 Select USB port Step 5 Select Disable Step 5 Select WT61P8 ...

Page 29: ...Copyright 2008 LG Electronics Inc All right reserved 27 LGE Internal Use Only Only for training and service purposes 27 Step 6 Load FW hex ...

Page 30: ...Copyright 2008 LG Electronics Inc All right reserved 28 LGE Internal Use Only Only for training and service purposes 28 Step 7 Execute Auto Then starting to D L FW to sub Micron ...

Page 31: ...Copyright 2008 LG Electronics Inc All right reserved 29 LGE Internal Use Only Only for training and service purposes 29 Step 8 Auto Programming and Auto Verify ...

Page 32: ...Copyright 2008 LG Electronics Inc All right reserved 30 LGE Internal Use Only Only for training and service purposes 30 Step 9 Check the D L information whether there is any mismatch ...

Page 33: ...Copyright 2008 LG Electronics Inc All right reserved 31 LGE Internal Use Only Only for training and service purposes 31 Step 1 Enter Factory Set Menu Step 2 Enter icon Version Information ...

Page 34: ...Copyright 2008 LG Electronics Inc All right reserved 32 LGE Internal Use Only Only for training and service purposes 32 Step 3 Enter icon MCU Step 4 Read SW Version and Build Date ...

Page 35: ...re When start failure happens please download Flash again First set Factory RS 232 communication mode at Debug mode and then follow the procedure below Please refer other methods at C323 document iDev Download Procedure FLASH Step 1 start iDev software and click setup Step 2 At setup menu select Image Path for Software to download and click Update boot sector Finally click ok go back to iDev home ...

Page 36: ...s Inc All right reserved 34 LGE Internal Use Only Only for training and service purposes 34 Step 3 Click down bottom Step 4 Plug in RS 232 down load cable Press keypad Volume and menu simultaneously and then press power on bottom ...

Page 37: ...lease reset TV 5 2 No Video No Backlight No OSD After normal start if no video or no backlight or no OSD happens please follow trouble shooting steps below Check Backlight Check T com 12V Check LCD_ON Pin Check Panel to U1 Path Check 24V Change U1 Check LCD_ON Path D L Fireware Change Panel Check LVDS Cable Check MB PB 12V Change Power Board Change U1 ...

Page 38: ...eck U9008 9V 14V Check Q8019 Power Board Check Path and Tuner Pin 16 CVBS Check C9056 CVBS Check I2C Check IF AGC Tuner IF D_IF Check C33 C34 D_IF Change Tuner Change Zoran 780 5 4 Component 1 Component 2 AV1 and AV2 Inputs show No Signal At Component or Composite mode if No Signal happens please follow the steps below Make Sure Signal Generator Is OK Component Input Composite Input Check U17 Vcc ...

Page 39: ...follow the steps below Is EEPROM Correct Re write HDMI Input PC Input Make Sure Signal Generator Is OK Check U9058 Vcc path to U1 Download FW again Check path to U1 Change U1 Zoran 780 5 6 No Sound If TV no sound happens please follow steps below Check OSD TV Speaker ON OFF HDMI Input Analog Input Check U9058 Vcc path Check EEPROM ckt and re write Check U9007 Vcc Input path Check U9002 Vcc Input o...

Page 40: ...38 6 ALIGNMENT Alignment Theorem and Procedure 6 1 1 Setup a Power on and enter factory mode to Factory Reset Reset All NVRAM Setting See picture 1 2 b Plug in test pattern or select Factory Utility in factory mode activate Burn In Mode See picture 3 4 c Warm up at least 1 hour Picture 1 Picture 2 Picture 3 Picture 4 ...

Page 41: ...d Gain 50 00 50 00 50 00 Green Gain 50 00 50 00 50 00 Blue Gain 50 00 50 00 50 00 Red Offset 50 00 50 00 50 00 Green Offset 50 00 50 00 50 00 Blue Offset 50 00 50 00 50 00 Note RGB gain offsets are in the range from 48 to 52 is suggested 6 1 3 Color Temperature Alignment and Theorem a Measurement equipment and condition Equipment Color Meter Minolta CA210 or equivalent Signal Generator Astro VG859...

Page 42: ...3 15 Saturation 173 209 Hue 128 128 Component NTSC PC 1024x768 60Hz Digital R Gain 642 702 Digital G Gain 636 700 Digital B Gain 643 708 Digital R Offset 1741 2033 Digital G Offset 2010 2033 Digital B Offset 1741 2033 Analog R Gain 0 0 Analog G Gain 0 0 Analog B Gain 0 0 Analog R Offset 240 128 Analog G Offset 192 128 Analog B Offset 240 128 Below are basic concepts of adjusting RGB gain offset th...

Page 43: ...ent Point Center of screen Measurement Distance 50mm Measurement Angle 90 degree Contrast max 100 Brightness max 100 Backlight max 100 Others default 6 1 4 Alignment procedure in FA out processing 6 1 4 1 ADC Calibration In factory mode choose Factory Reset Reset All NVRAM Setting Set Picture mode at Dynamic Using AV1 CVBS NTSC with Color Bar white 75 signal a Select input source AV1 of operation ...

Page 44: ...th 16 Gray Level signal a Select input source PC of operation unit and plug in PC cable 1024x768 60Hz with 16 Gray Level signal Astro PG1 Timing856 Pattern921 b Press first item in factory menu Auto Calibration Calibrate PC to execute calibration see picture 8 9 c The signal level show as picture 10 1 10 3 respective R G and B signals Picture 8 Picture 9 ...

Page 45: ...Copyright 2008 LG Electronics Inc All right reserved 43 LGE Internal Use Only Only for training and service purposes 43 Picture 10 1 Picture 10 2 ...

Page 46: ...ite 75 signal a Select input source Component1 of operation unit and plug in component cable NTSC with Color Bar white 75 signal Astro PG1 Timing968 Pattern968 b Press first item in factory menu Auto Calibration Calibrate Component SD to execute calibration See picture 11 12 c The signal level show as picture 13 1 13 3 respective Y Cb and Cr signals Picture 11 Picture 12 ...

Page 47: ...Copyright 2008 LG Electronics Inc All right reserved 45 LGE Internal Use Only Only for training and service purposes 45 Picture 13 1 Picture 13 2 ...

Page 48: ...ent NTSC Using 85 white pattern to adjust values of gain of R and B for cool medium and warm until color temperature is within spec please let G gain fix at default value 6 1 4 3 Maximum Luminance Check Since the maximum luminance should be confirmed in the condition of maximum contrast and brightness we can define an alternative to check luminance based on experienced value ...

Page 49: ...Copyright 2008 LG Electronics Inc All right reserved 47 LGE Internal Use Only Only for training and service purposes 47 7 CIRCUIT DIAGRAM 7 1 Main Board Schematics 7 1 1 AV1 Component 1 and Component ...

Page 50: ...Copyright 2008 LG Electronics Inc All right reserved 48 LGE Internal Use Only Only for training and service purposes 48 7 1 2 PC ...

Page 51: ...Copyright 2008 LG Electronics Inc All right reserved 49 LGE Internal Use Only Only for training and service purposes 49 7 1 3 HDMI and HDMI switch ...

Page 52: ...Copyright 2008 LG Electronics Inc All right reserved 50 LGE Internal Use Only Only for training and service purposes 50 7 1 4 HDMI ESD Protection ...

Page 53: ...Copyright 2008 LG Electronics Inc All right reserved 51 LGE Internal Use Only Only for training and service purposes 51 7 1 5 SD and HD Video Input ...

Page 54: ...Copyright 2008 LG Electronics Inc All right reserved 52 LGE Internal Use Only Only for training and service purposes 52 7 1 6 Power ...

Page 55: ...Copyright 2008 LG Electronics Inc All right reserved 53 LGE Internal Use Only Only for training and service purposes 53 7 1 7 LVDS and GPIO ...

Page 56: ...Copyright 2008 LG Electronics Inc All right reserved 54 LGE Internal Use Only Only for training and service purposes 54 7 1 8 Sub MCU ...

Page 57: ...Copyright 2008 LG Electronics Inc All right reserved 55 LGE Internal Use Only Only for training and service purposes 55 7 1 9 Audio Processor ...

Page 58: ...Copyright 2008 LG Electronics Inc All right reserved 56 LGE Internal Use Only Only for training and service purposes 56 7 1 10 Audio Amplifier ...

Page 59: ...Copyright 2008 LG Electronics Inc All right reserved 57 LGE Internal Use Only Only for training and service purposes 57 7 1 11 HD780 Power and Ground ...

Page 60: ...Copyright 2008 LG Electronics Inc All right reserved 58 LGE Internal Use Only Only for training and service purposes 58 7 1 12 DDR Interface ...

Page 61: ...Copyright 2008 LG Electronics Inc All right reserved 59 LGE Internal Use Only Only for training and service purposes 59 7 1 13 Tuner and Demodulator ...

Page 62: ...Copyright 2008 LG Electronics Inc All right reserved 60 LGE Internal Use Only Only for training and service purposes 60 7 1 14 IO Reserved Test ...

Page 63: ...Copyright 2008 LG Electronics Inc All right reserved 61 LGE Internal Use Only Only for training and service purposes 61 7 1 15 Key IR Remote Side ...

Page 64: ...Copyright 2008 LG Electronics Inc All right reserved 62 LGE Internal Use Only Only for training and service purposes 62 7 2 Power Board Schematics ...

Page 65: ...Copyright 2008 LG Electronics Inc All right reserved 63 LGE Internal Use Only Only for training and service purposes 63 7 3 Keypad BD Schematics ...

Page 66: ...Copyright 2008 LG Electronics Inc All right reserved 64 LGE Internal Use Only Only for training and service purposes 64 7 4 IR BD Schematics ...

Page 67: ...Copyright 2008 LG Electronics Inc All right reserved 65 LGE Internal Use Only Only for training and service purposes 65 7 5 Side AV BD Schematics ...

Page 68: ...Copyright 2008 LG Electronics Inc All right reserved 66 LGE Internal Use Only Only for training and service purposes 66 8 EDID WRITE 8 1 Summary 8 2 Write HDMI EDID data ...

Page 69: ...Copyright 2008 LG Electronics Inc All right reserved 67 LGE Internal Use Only Only for training and service purposes 67 8 3 EDID DATA 37 PC 37 HDMI1 ...

Page 70: ...Copyright 2008 LG Electronics Inc All right reserved 68 LGE Internal Use Only Only for training and service purposes 68 37 HDMI2 ...

Page 71: ...CK DIAGRAM IF Digital LVDS 8 8 8 60 50 Hz Video Signal Flow ATSC NTSC Y Pb Pr LCD Panel Zoran 770 780 ATSC De interlace Scaler Video Decoder Com 1 G B R D sub R G B H V HDMI1 HDMI2 TMDS VGA Video Switch Y Pb Pr Com 2 G B R Y Pb Pr HDMI3 HDMI Switch CVBS Analog Tuner CVBS S Y S C AV 1 S Video CVBS CVBS S Y S C AV 2 Side CVBS S Video ...

Page 72: ...vice purposes 70 Audio out Zoran 770 780 Audio Signal Flow SIF VGA Audio In R L AV1 Audio In R L 10W 10W L AV2 Audio In Side R L R L R STV8358FSX Sound Processor TQFP100 I2S I2S L Com 1 Audio In R L R L Com 2 Audio In R L R L HDMI1 HDMI2 Digital Audio HDMI3 HDMI Switch SPDIF STA333W Audio Amplifier Tuner ...

Page 73: ...t mote and Paint lumps that occur upon injection post manufacturing and handling Must be no weld lines flow marks gates on appearance surface Cosmetics of Back Cover Must be no flash weld lines flow marks shiny spots The gates should look gook Make it sink on surface Surface texture pattern must be same with the sample given by LG Other cosmetics follow LG ID spec Gaps between LCD panel Bezel Keep...

Page 74: ... Item Test SPEC Control Buttons The button mechanism must be smooth to operate and robust Buttons should not rattle be too loose or too tight Printing follow LG ID spec included color size font Printing Ink Test Test Scrub 50 times both ways using JIG The Jig is 1kgf weight wrapped the gauze stained ethyl alcohol Scraping speed is 30 40times min Judgments Must not be erased Kensington Lock Add Ken...

Page 75: ...Jul 2008 Printed in Korea P NO MFL39166213 ...

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