Page 2 - CONTENTS
- 2 - LGE Internal Use Only Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes CONTENTS CONTENTS .............................................................................................. 2 PRODUCT SAFETY .................................................
Page 3 - SAFETY PRECAUTIONS; General Guidance; Before returning the receiver to the customer,; Leakage Current Cold Check(Antenna Cold Check); Leakage Current Hot Check circuit; IMPORTANT SAFETY NOTICE
LGE Internal Use Only Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes - 3 - SAFETY PRECAUTIONS Many electrical and mechanical parts in this chassis have special safety-related characteristics. These parts are identified by in theSchematic Diagram and E...
Page 4 - SERVICING PRECAUTIONS
LGE Internal Use Only Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes - 4 - CAUTION: Before servicing receivers covered by this servicemanual and its supplements and addenda, read and follow the SAFETY PRECAUTIONS on page 3 of this publication. NOTE: I...
Page 6 - SPECIFICATION; Requirement for Test
LGE Internal Use Only Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes - 6 - SPECIFICATION NOTE : Specifications and others are subject to change without notice for improvement. 1. Application range This specification is applied to the LCD TV used LD91A...
Page 8 - ADJUSTMENT INSTRUCTION; Main PCB check process
LGE Internal Use Only Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes - 8 - ADJUSTMENT INSTRUCTION 1. Application Range This specification sheet is applied to all of the LCD TV withLD91A chassis. 2. Designation 1) T h e a d j u s t m e n t i s a c c o ...
Page 10 - Total Assembly line process
4. Total Assembly line process 4.1. Adjustment Preparation · W/B Equipment condition CA210 : CH 9, Test signal : Inner pattern (85IRE) · Above 5 minutes H/run in the inner pattern. (“power on” key of adjust remote control) * Connecting picture of the measuring instrument (On Automatic control)Inside...
Page 13 - EXPLODED VIEW
- 13 - LGE Internal Use Only Copyright LG Electronics. Inc. All right reserved. Only for training and service purposes 300 200 801 802 803 804 805 806 520 530 540 550 400 900 120 510 500 320 310 LV 1 A2 A5 A10 Option Option Option EXPLODED VIEW Many electrical and mechanical parts in this chassis ha...
Page 20 - E A R P H O N E A M P
T H E S Y M B O L M A R K O F T H I S S C H E M E T I C D I A G R A M I N C O R P O R A T E SS P E C I A L F E A T U R E S I M P O R T A N T F O R P R O T E C T I O N F R O M X - R A D I A T I O N .F I L R E A N D E L E C T R I C A L S H O C K H A Z A R D S , W H E N S E R V I C I N G I F I S E S S ...
Page 21 - F R O M L I P S & P O W E R B / D; S 6 c o r e 1 . 2 6 v o l t
T H E S Y M B O L M A R K O F T H I S S C H E M E T I C D I A G R A M I N C O R P O R A T E SS P E C I A L F E A T U R E S I M P O R T A N T F O R P R O T E C T I O N F R O M X - R A D I A T I O N .F I L R E A N D E L E C T R I C A L S H O C K H A Z A R D S , W H E N S E R V I C I N G I F I S E S S ...
Page 22 - S C A R T 2 P I N 8
T H E S Y M B O L M A R K O F T H I S S C H E M E T I C D I A G R A M I N C O R P O R A T E SS P E C I A L F E A T U R E S I M P O R T A N T F O R P R O T E C T I O N F R O M X - R A D I A T I O N .F I L R E A N D E L E C T R I C A L S H O C K H A Z A R D S , W H E N S E R V I C I N G I F I S E S S ...
Page 23 - T U N E R
T H E S Y M B O L M A R K O F T H I S S C H E M E T I C D I A G R A M I N C O R P O R A T E SS P E C I A L F E A T U R E S I M P O R T A N T F O R P R O T E C T I O N F R O M X - R A D I A T I O N .F I L R E A N D E L E C T R I C A L S H O C K H A Z A R D S , W H E N S E R V I C I N G I F I S E S S ...
Page 24 - M o d u l e; S m a l l
T H E S Y M B O L M A R K O F T H I S S C H E M E T I C D I A G R A M I N C O R P O R A T E SS P E C I A L F E A T U R E S I M P O R T A N T F O R P R O T E C T I O N F R O M X - R A D I A T I O N .F I L R E A N D E L E C T R I C A L S H O C K H A Z A R D S , W H E N S E R V I C I N G I F I S E S S ...
Page 26 - Mstar S6; Block diagram; Main Block
Block Diagram Block Diagram RGB COMPONENT F-SCART AV3 BUF_TS_CLK/ERR/SYN/DATA[0] AV_CVBS_IN DDR2 SDRAM (1Gb) IC300 NAND Flash HYNIX IC102 USB Digital amp (NTP3100L) IC701 COMP_Y/Pb/Pr SC1_CVBS_IN SC2_CVBS_IN I2S DSUB_ R/G/B Tuner (TDFW-G235D1) TU1000 LCD Panel - 19/22/26/32/37/42LH2000- 32/37/42/47L...
Page 27 - TCON with FRC; Multi Channel; In different
37 GIP Block Diagram 37 GIP Block Diagram TCON with FRC MST7327N IC101 M+S T-Con Block SPI_CZ/CK & DI/DO DDR_A_D[0:15] DDR2 SDRAM (512MB / 533MHz) HYNIX IC201 DDR_B_D[16:31] DDR_A_A[0:12] DDR_B_A[0:12] Serial Flash W25X32VSSIG IC102 DDR2 SDRAM (512MB / 533MHz) HYNIX IC202 Multi Channel DC/DC Con...
Page 29 - Contents of LCD TV Standard Repair Process
Contents of LCD TV Standard Repair Process No. Error symptom (High category) Error symptom (Mid category) Page Remarks 1 A. Video error No video/Normal audio 1 2 No video/No audio 2 3 Video error, video lag/stop 3 4 Color error 4 5 Vertical/Horizontal bar, residual image,light spot, external device ...
Page 30 - Standard Repair Process; LCD TV
Normal audio Y N Move to Novideo/No audio No videoNormal audio Check Back LightOn with naked eye On Y N Check PowerBoard12v,5v etc. Normal voltage Y N Replace Main Board Replace T-conBoard or moduleAnd Adjust VCOM OR Repair PowerBoard or parts Check Power Board 20V /12V or 24v output Normalvoltage Y...
Page 31 - Established; Error
Normal voltage? Check variousvoltages of PowerBoard ( 5V,12V,20Vor 24V…) No Video/No audio Check andreplaceMAIN B/D Y Replace PowerBoard and repairparts N End Standard Repair Process A. Video error No video/ No audio Established date Revised date 2008. 3 .05 2/13 LCD TV Error symptom 2 Downloaded Fr...
Page 32 - Menu; Normal
A. Picture Problem Picture broken/ Freezing Y N N Check RF Signal level Normal Signal? Check RF Cable Connection 1. Reconnection 2. Install Booster Check S/W Version Booster menu On Off: Check Off On: Check S/W Upgrade Check whether other equipments have problem or not. (By connecting RF Cable at ot...
Page 33 - End; LGD Module; Color
Color error? Y N Check and replaceLink Cable(LVDS) andcontactcondition Y N Replace Main B/D Color error? Check errorcolor inputmode Check color by input-External Input-COMPONENT-RGB-HDMI/DVI Y External device /Cable normal External Input/ Component error Checkexternaldevice andcable Y External devic...
Page 34 - External device screen error-Color error; LGD Module Only; Other Module
Screen normal? N Y Check externaldeviceconnectioncondition Y N Check andreplace LinkCable Normal? Y N Screen normal? Replace Main B/D Replacemodule Check color condition by input-External Input-Component-RGB-HDMI/DVI End Vertical/Horizontal bar, residual image, light spot Request repairfor externald...
Page 35 - Measure voltage of each output of Power B/D; 9 years new model apply; Doesn’t turn on by remote control; Mechanical Power switch
B. Power error No power Power LED On? Y N DC Power onby pressing Power KeyOn Remote control Y N Normal operation? Check PowerOn ‘”High” Check Power cord was inserted properly CheckPower LED ReplacePower B/D Measure voltage of each output of Power B/D N Y Normal voltage? Replace Main B/D N Y OK? Repl...
Page 36 - CPU
B. Power error Off when on, off while viewing, power auto on/off Error? N Y Check Power OffMode Fix A/C code & Outletand describe 3 wave length Check A/C code Check for 3 wave length Check outlet Replace Main B/D CPU Abnormal (If Power Off modeis not displayed)Check Power B/Dvoltage Y N Replace ...
Page 37 - Off
No audio Screen normal Check usermenu >Speaker off Off N Y Cancel OFF and describe Check audio B+20V or 24V ofPower Board Normal voltage Y N Replace Power Board and repair parts CheckSpeakerdisconnection N Y Replace Speaker Replace MAIN Board End C. Audio error No audio/ Normal video Disconnectio...
Page 39 - D. General Function Problem; Remote control & Local switch checking; Move; ) switch operating error; Cable connection
D. General Function Problem Remote control & Local switch checking Y N 1. Remote control (R/C) operating error Move Power problem Section 2. Local(Mechanical ) switch operating error Check R/C itself Operation Normal operating? Normal operating? Y Close Replace R/C If R/C operate, Explain the cu...
Page 42 - Adjust VCOM
Replace module Zoom part withexterior damage Module damage Cabinet damage Replace cabinet Replace remote controller Remote controller damage Stand dent Replace stand F. Exterior defect Exterior defect Adjust VCOM Established date Revised date 2008. 3 .05 13/13 LCD TV Error symptom Standard Repair Pr...
Page 43 - LCD TV Repair Process Index
LCD TV Repair Process Index - Trouble shooting by input block (Component level check) No. Symptom (L) Input Block Page Remark 1 Power Problem Power-up Boot fail 1~2 2 Video Problem No OSD 3~4 3 Digital TV 5 4 Analog TV 6 5 AV (Scart / CVBS/ S-Video) 7~12 6 Component 13 7 RGB(D-SUB) 14~15 8 HDMI 16~1...
Page 44 - LCD TV; Symptom
P800 Pin #7~#10 Voltage Level = 5V ? P800 Pin #2 Voltage level = 5V ? Check Power connector OK ? Replace Power Board YES NO YES P800 Pin #13, 14 = 12V P800 Pin #17, 18 = 24V ? NO Replace Power Board YES NO Replace MAIN B’D Q801 MAIN B’D L803 = 3.3V ? Replace MAIN B’D IC801 YES NO MAIN B’D L813 = 1.2...
Page 45 - Check Power connector; Making
Check Power connector OK ? Replace Power Board NO YES Replace Power Board NO Replace MAIN B’D IC801 NO Replace MAIN B’D IC805 NO Replace MAIN B’D IC806 NO Replace MAIN B’D IC100 NO Replace MAIN B’D IC103 Serial Flash NO Replace MAIN B’D IC300, IC301 DDR2 Memory NO Replace MAIN B’D IC100 NO Making Re...
Page 46 - No OSD
P800 Pin #20 Voltage level = 2V Check Power connector OK ? Replace Power Board YES NO YES NO YES Replace MAIN B’D Q802 MAIN B’D L1300 = 12V ? Replace MAIN B’D Q806 NO Replace Main Board YES P800 Pin #13, 14 = 12V P800 Pin #17, 18 = 24V ? Check LVDS Cable OK ? YES Replace LVDS Cable NO Making Revisio...
Page 48 - Check RF Cable; Replace MAIN B’D IC809; YES; Replace MAIN B’D IC808; YES; Digital TV Video Problem
Check RF Cable MAIN B’D L1201 = 5V ? YES MAIN B’D L1202 = 3.3V ? NO Replace MAIN B’D IC809 YES NO Replace MAIN B’D IC808 MAIN B’D IC804 Pin #2 = 1.2V ? Replace MAIN B’D IC804 YES NO YES MAIN B’D R1210 Clock ? NO Replace MAIN B’D TU1200 Making Revision 2009. 2 . 1 LCD TV Symptom Digital TV Video Prob...
Page 49 - Analog TV Video Problem
Making Revision 2009. 2 . 1 LCD TV Symptom Analog TV Video Problem Check RF Cable MAIN B’D L1201 = 5V ? YES MAIN B’D L1202 = 3.3V ? NO Replace MAIN B’D IC809 YES NO Replace MAIN B’D IC808 MAIN B’D IC804 Pin #2 = 1.2V ? Replace MAIN B’D IC804 YES NO YES MAIN B’D R1210 Clock ? NO Replace MAIN B’D TU12...
Page 52 - Replace MAIN B’D C211; AV2 No Video Problem
Check Signal format Is it supported? Check the SCART Cable YES MAIN B’D JK1101 Check Replace MAIN B’D JK1101 YES NO Check MAIN B’D R1133 Video Signal ? NO YES Check MAIN B’D C211 Video Signal ? Replace MAIN B’D C211 NO Replace MAIN B’D IC 100 YES Making Revision 2009. 2 . 1 LCD TV Symptom AV2 No Vid...
Page 53 - Replace MAIN B’D JK402; Replace MAIN B’D C217
Check Signal format Is it supported? Check the CVBS Cable YES MAIN B’D JK402 Check Replace MAIN B’D JK402 YES NO Check MAIN B’D R400 Video Signal ? NO YES Check MAIN B’D C217 Video Signal ? Replace MAIN B’D C217 NO Replace MAIN B’D IC 100 YES Making Revision 2009. 2 . 1 LCD TV Symptom AV3(CVBS) No V...
Page 54 - Check the SCART Cable; Check the Trouble Shooting Guide; AV1 No Video Out Problem
Check Spec (Refer to User Manual) Is it supported? Check the SCART Cable YES Check the Trouble Shooting Guide Analog TV No video YES Check MAIN B’D R1205 Video Signal ? NO Replace MAIN B’D Q1205 YES Check MAIN B’D C1107 Video Signal ? NO MAIN B’D JK1100 Check YES Making Revision 2009. 2 . 1 11/34 LC...
Page 55 - Replace MAIN B’D IC 100; AV2 No Video Out Problem
Check Spec (Refer to User Manual) Is it supported? Check the SCART Cable YES YES Check MAIN B’D C1122 Video Signal ? NO MAIN B’D JK1101 Check YES Replace MAIN B’D IC 100 Making Revision 2009. 2 . 1 12/34 LCD TV Symptom AV2 No Video Out Problem 26~42LH200032~47LH3000/LH4000 Downloaded From TV-Manual....
Page 56 - Replace MAIN B’D JK400
Check Signal format Is it supported? Check the Component Cable YES MAIN B’D JK400 Check Replace MAIN B’D JK400 YES NO Check MAIN B’D R419 Video Signal ? NO YES Check MAIN B’D C209, C215 (Y) C216 (Pb) C214 (Pr) Video Signal ? Replace MAIN B’D C209 or C214 or C215 or C216 NO Replace MAIN B’D IC 100 YE...
Page 57 - Replace MAIN B’D P400; RGB No Video Problem
Check Signal format Is it supported? Check the RGB Cable YES MAIN B’D P400 Check Replace MAIN B’D P400 YES NO NO YES Check MAIN B’D C208 (Video) R246 (HSYNC) R245 (VSYNC) Replace MAIN B’D C208 or R246 or R247 NO Replace MAIN B’D IC 100 YES MAIN B’D P400 Pin #2 Video signal ? R437 has Vsync ? R440 ha...
Page 58 - RGB No Color Problem
Check Signal format Is it supported? Check the RGB Cable YES MAIN B’D P400 Check Replace MAIN B’D P400 YES NO NO YES Check MAIN B’D C212 (RED) C207 (GREEN) C213 (BLUE) Video Signal ? Replace MAIN B’D C212 or C207 or C213 NO Replace MAIN B’D IC 100 YES MAIN B’D P400 Pin #3 (BLUE) Pin #2 (GREEN) Pin #...
Page 59 - Download EDID; HDMI 1~3 All No Video Problem
Check Signal format Is it supported? Check the HDMI Cable YES YES Replace MAIN B’D IC 100 Check the ADJUST MENU EDID OK ? YES Download EDID (Refer to Adjustment Spec) NO NO Replace MAIN B’D IC107 (HDCP KEY) Making Revision 2009. 2 . 1 16/34 LCD TV Symptom HDMI 1~3 All No Video Problem HDMI1 – ALL MO...
Page 61 - _ If headphone is connected, Speaker sound doesn’; Replace MAIN B’D IC803; All Source no Audio Problem
Check The Speaker Check Speaker Cable YES Check P700 Cable YES NO Replace MAIN B’D IC 701 YES MAIN B’D L705 Pin #1L704 Pin #2 PWM Signal ? Replace Speaker NO Replace Speaker Cable NO CHECK MAIN B’D JK700 or JK701 YES Replace MAIN B’D JK700 or JK701 NO _ If headphone is connected, Speaker sound doesn...
Page 62 - Digital TV Video OK ?; Digital TV No Audio Problem
Digital TV Video OK ? YES Replace MAIN B’D IC 100 Making Revision 2009. 2 . 1 19/34 LCD TV Symptom Digital TV No Audio Problem 26~42LH200032~47LH3000/LH4000 Downloaded From TV-Manual.com Manuals
Page 63 - Check MAIN B’D; Analog TV No Audio Problem
MAIN B’D TU1200 Pin #17 Signal (SIF) Replace MAIN B’D TU1200 NO Analog TV Video OK ? YES Check MAIN B’D C231 Signal (SIF) NO Replace MAIN B’D IC100 YES Making Revision 2009. 2 . 1 20/34 LCD TV Symptom Analog TV No Audio Problem 26~42LH200032~47LH3000/LH4000 Downloaded From TV-Manual.com Manuals
Page 64 - AV1 No Audio Problem
Check the SCART Cable YES Check MAIN B’D C229, C230 MAIN B’D C229 (Right Sound) C230 (Left Sound) signal ? YES NO Replace MAIN B’D IC 100 AV1 Video OK ? YES Check MAIN B’D JK1100 Replace MAIN B’D JK1100 NO YES Making Revision 2009. 2 . 1 21/34 LCD TV Symptom AV1 No Audio Problem 26~42LH200032~47LH30...
Page 65 - AV2 No Audio Problem
Check the SCART Cable YES Check MAIN B’D C2008, C2009 MAIN B’D C2008 (Right Sound) C2009 (Left Sound) signal ? YES NO Replace MAIN B’D IC 100 AV2 Video OK ? YES Check MAIN B’D JK1101 Replace MAIN B’D JK1101 NO YES Making Revision 2009. 2 . 1 22/34 LCD TV Symptom AV2 No Audio Problem 26~42LH200032~47...
Page 66 - Check the CVBS Cable; AV3 No Audio Problem
Check the CVBS Cable YES Check MAIN B’D C2011, C2012 MAIN B’D C2011 (Right Sound) C2012 (Left Sound) signal ? YES NO Replace MAIN B’D IC 100 AV3 Video OK ? YES Check MAIN B’D JK402 Replace MAIN B’D JK402 NO YES Making Revision 2009. 2 . 1 23/34 LCD TV Symptom AV3 No Audio Problem 26~42LH200032~47LH3...
Page 67 - Component No Audio Problem
Check the CVBS Cable YES Check MAIN B’D C2013, C2014 MAIN B’D C2013 (Right Sound) C2014 (Left Sound) signal ? YES NO Replace MAIN B’D IC 100 Component Video OK ? YES Check MAIN B’D JK400 Replace MAIN B’D JK400 NO YES Making Revision 2009. 2 . 1 24/34 LCD TV Symptom Component No Audio Problem 26~42LH...
Page 68 - Check the PC Audio Cable; Replace MAIN B’D JK401
Check the PC Audio Cable YES Check MAIN B’D C2015, C2016 MAIN B’D C2015 (Right Sound) C2016 (Left Sound) signal ? YES NO Replace MAIN B’D IC 100 RGB Video OK ? YES Check MAIN B’D JK401 Replace MAIN B’D JK401 NO YES Making Revision 2009. 2 . 1 25/34 LCD TV Symptom RGB, HDMI-PC No Audio Problem 26~42L...
Page 69 - Check the ADJUST MENU; HDMI-DTV No Audio Problem
HDMI Video OK ? YES Check the ADJUST MENU EDID OK ? YES Download EDID (Refer to Adjustment Spec) NO Check the HDMI Cable Replace MAIN B’D IC100 YES Making Revision 2009. 2 . 1 26/34 LCD TV Symptom HDMI-DTV No Audio Problem 26~42LH200032~47LH3000/LH4000 Downloaded From TV-Manual.com Manuals
Page 70 - AV1 No Audio Out Problem
Check the SCART Cable YES Replace MAIN B’D IC1103 MAIN B’D R239 (Right Sound) R240 (Left Sound) signal ? NO YES Replace MAIN B’D IC 100 Analog TV Audio OK YES Check MAIN B’D JK1100 Replace MAIN B’D JK1100 NO YES Check the Trouble Shooting Guide Analog TV No video NO Making Revision 2009. 2 . 1 27/34...
Page 71 - AV2 No Audio Out Problem
Check the SCART Cable YES Replace MAIN B’D IC1103 MAIN B’D R250 (Right Sound) R251 (Left Sound) signal ? NO YES Replace MAIN B’D IC 100 Speaker Audio OK YES Check MAIN B’D JK1101 Replace MAIN B’D JK1101 NO YES Check the Trouble Shooting Guide Related to Audio Problem NO Making Revision 2009. 2 . 1 2...
Page 72 - Check the Headphone Cable; Headphone No Audio Problem
Check the Headphone Cable YES Replace MAIN B’D IC700 MAIN B’D R237 (Right Sound) R238 (Left Sound) signal ? NO YES Replace MAIN B’D IC 100 Speaker Audio OK YES Check MAIN B’D JK700 or JK701 Replace MAIN B’D JK700 or JK701 NO YES Check the Trouble Shooting Guide Related to Audio Problem NO Making Rev...
Page 73 - Check the SPDIF Cable; Replace MAIN B’D JK403; SPDIF No Audio Problem
Check the SPDIF Cable YES Check MAIN B’D R230 PWM Signal ? Replace MAIN B’D IC 100 Speaker Audio OK YES Check MAIN B’D JK403 Replace MAIN B’D JK403 NO YES NO Check the Trouble Shooting Guide Related to Audio Problem NO Making Revision 2009. 2 . 1 30/34 LCD TV Symptom SPDIF No Audio Problem 26~42LH20...
Page 74 - USB No Connect Problem
Check MAIN B’D JK405 Pin #1 5V ? NO Check MAIN B’D R848 12V ? Check that the USB Memory & HDD are supported by Spec (Refer to User Manual’s USB cautions) YES Check MAIN B’D R801 5V ? Replace MAIN B’D IC402 YES NO Replace MAIN B’D IC808 YES YES Replace MAIN B’D IC 100 Check MAIN B’D JK405 OK ? YE...
Page 75 - Check IR B’D P1 Wafer; Replace it; Replace IR B’D; Remote Control Problem
Check IR B’D P1 Wafer & Connector Check MAIN B’D P1304 Wafer & Connector YES NO Replace it YES Replace IR B’D Making Revision 2009. 2 . 1 32/34 LCD TV Symptom Remote Control Problem 26~42LH200032~47LH3000/LH4000 Downloaded From TV-Manual.com Manuals
Page 76 - Replace MAIN B’D IC100; Replace IR B’D IC1
Check IR B’D P1 Wafer & Connector Check MAIN B’D P1305 Wafer & Connector YES NO Replace MAIN B’D IC100 IR B’D IC1 Pin #3 Voltage 4V ? NO NO Replace it YES Replace IR B’D IC1 NO Replace MAIN B’D IC100 Making Revision 2009. 2 . 1 33/34 LCD TV Symptom Remote Control Problem 19~22LH2000 Download...
Page 77 - Intelligent Sensor Problem
Check IR B’D P1 Wafer & Connector Check MAIN B’D P1304 Wafer & Connector YES YES NO Replace it Replace IR B’D Making Revision 2009. 2 . 1 34/34 LCD TV Symptom Intelligent Sensor Problem 32~47LH4000 Downloaded From TV-Manual.com Manuals
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