LG 32LH550B Service Manual
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LG 32LH550B Service Manual

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LED TV
SERVICE MANUAL
CHASSIS : LA66K
MODEL : 32LH550B
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
P/NO : MFL69442201 (1601-REV00)
Internal Use Only
Printed in Korea

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  • Page 1 Internal Use Only LED TV SERVICE MANUAL CHASSIS : LA66K MODEL : 32LH550B CAUTION BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. P/NO : MFL69442201 (1601-REV00) Printed in Korea...

  • Page 2: Table Of Contents

    BLOCK DIAGRAM ................... 17 EXPLODED VIEW .................. 18 PRODUCT DISASSEMBLY PROCESS ...........19 SCHEMATIC CIRCUIT DIAGRAM ........... APPENDIX TROUBLESHOOTING .............. APPENDIX - 2 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 3: Safety Precautions

    An other abnormality exists that must be corrected before the receiver is returned to the customer. - 3 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 4: Servicing Precautions

    - 4 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 5 1. Clip each fuse or resistor lead at top of the circuit board hollow stake. 2. Securely crimp the leads of replacement component around notch at stake top. - 5 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 6: Specification

    Temp : 0 ~ 40 deg Humidity : ~ 80 % Storage Environment Temp : -20 ~ 60 deg Humidity : ~ 85 % - 6 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 7 HDTV 1080P 1920*1080 26.970 23.976 74.176 HDTV 1080P 1920*1080 33.750 30.000 74.250 HDTV 1080P 1920*1080 33.710 29.970 74.176 HDTV 1080P - 7 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 8 HDTV 1080P 1920*1080 33.75 30.00 79.20 HDTV 1080P 1920*1080 67.43 59.94 148.350 HDTV 1080P 1920*1080 67.5 60.00 148.50 HDTV 1080P - 8 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 9: Adjustment Instruction

    (2) Manual adjustment for ADC calibration and White balance. (3) Shipment conditions, Channel pre-set 4.2.6. Inspection - In INSTART menu, check these keys. - 9 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 10 HDMI cable and D-sub cable are not need. ▪ Adjust remocon 4.4.3.2. HD AC3 (2D 8bit xvYCC : off) : 32LH570B-UC (1) HDMI1 (6D , 96) - 10 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 11 (2) HDMI2 (6D , 7D) 4.4.3.5. FHD AC3 (2D 8bit xvYCC : off) : 43/49/55LH5700-UD (1) HDMI1 (E5 , 5A) - 11 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 12 RS -232C Pat t ern Generat o r Signal Source * If TV internal pattern is used, not needed - 12 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 13 ▪ W/B Adj. must begin as start command “wb 00 00” , and finish as end command “wb 00 ff”, and Adj. offset if need - 13 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 14 5.3.2. Check the menu on in-start 10-19 20-35 36-49 50-79 80-119 Over 120 (3) O/S Module(AUO, INX, Sharp, CSOT, BOE) cool warm spec target - 14 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 15 ▪ After final inspection, press In-Stop key of the Adj. R/C and check that the unit goes to Stand-by mode. - 15 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 16 (2) Select "Tool Option 1" and Push “OK” button. (3) Punch in the number. (Each model has their number.) - 16 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 17: Block Diagram

    BLOCK DIAGRAM - 17 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 18: Exploded View

    Shock, Fire, or other Hazards. Do not modify the original design without permission of manufacturer. - 18 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 19: Product Disassembly Process

    (with descriptions and arrows identifying locations) can be inserted below: - 19 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 20 Fig.1 Fig.2 - 20 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 21 Fig.3 Fig.4 - 21 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 22 16Y_M2 2015.10.02 ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. MAIN1 LGE Internal Use Only Copyright 2016 LG Electronics Inc. All rights reserved. Only for training and service purposes...
  • Page 23 2015.10.02 16Y_M2 ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. MAIN2 LGE Internal Use Only Copyright 2016 LG Electronics Inc. All rights reserved. Only for training and service purposes...
  • Page 24 FIRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS 2015.10.02 16Y_M2 ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. LGE Internal Use Only Copyright 2016 LG Electronics Inc. All rights reserved. Only for training and service purposes...
  • Page 25 M2_Simple Smart ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. POWER LGE Internal Use Only Copyright 2016 LG Electronics Inc. All rights reserved. Only for training and service purposes...
  • Page 26 16Y_M2 2015.09.02 ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. MICOM LGE Internal Use Only Copyright 2016 LG Electronics Inc. All rights reserved. Only for training and service purposes...
  • Page 27 M2_Simple Smart 2015.07.07 ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR HDMI THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. LGE Internal Use Only Copyright 2016 LG Electronics Inc. All rights reserved. Only for training and service purposes...
  • Page 28 FIRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR JACK THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. LGE Internal Use Only Copyright 2016 LG Electronics Inc. All rights reserved. Only for training and service purposes...
  • Page 29 ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. IR / KEY / WIFI LGE Internal Use Only Copyright 2016 LG Electronics Inc. All rights reserved. Only for training and service purposes...
  • Page 30 FIRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. LGE Internal Use Only Copyright 2016 LG Electronics Inc. All rights reserved. Only for training and service purposes...
  • Page 31 FIRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR ETHERNET THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. LGE Internal Use Only Copyright 2016 LG Electronics Inc. All rights reserved. Only for training and service purposes...
  • Page 32 FIRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR AUDIO AMP THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. LGE Internal Use Only Copyright 2016 LG Electronics Inc. All rights reserved. Only for training and service purposes...
  • Page 33 16Y_M2 2015.09.02 ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. TUNER_1 LGE Internal Use Only Copyright 2016 LG Electronics Inc. All rights reserved. Only for training and service purposes...
  • Page 34 16Y_M2 2015.09.02 ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. TUNER_2 LGE Internal Use Only Copyright 2016 LG Electronics Inc. All rights reserved. Only for training and service purposes...
  • Page 35 M2_Simple Smart 2015.07.07 ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. LVDS LGE Internal Use Only Copyright 2016 LG Electronics Inc. All rights reserved. Only for training and service purposes...
  • Page 36 16Y_M2 2015.09.02 ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. eMMC LGE Internal Use Only Copyright 2016 LG Electronics Inc. All rights reserved. Only for training and service purposes...
  • Page 37 FIRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR RS232C THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. LGE Internal Use Only Copyright 2016 LG Electronics Inc. All rights reserved. Only for training and service purposes...
  • Page 39 32LH55 Trouble shooting guide 2016. 01. 29 TV Product Development Depa rtment team 3...
  • Page 40 Contents of LCD TV Standard Repair Process * First of all, Check whether there is SVC Bulletin in GCSC System for these model. Error symptom (High category) Error symptom (Mid category) Page Remarks No video/Normal audio No video/No audio Tuning fail, Picture broken/ Freezing 3, 4 A.
  • Page 41 Standard Repair Process Error Symptom A. Video Error Established date 2016.01.29 LCD TV 1/14 Content No video / Normal audio Revised date First of all, Check whether all of cables between board is inserted properly or not. (Main B/D ↔ Adaptor, LVDS Cable, Speaker Cable, IR B/D Cable…) ☞A1 ☞A4 No video...
  • Page 42 Standard Repair Process Error Symptom A. Video Error Established date 2016.01.29 LCD TV 2/14 Content No video / No audio Revised date ☞A13 No video / Check voltage 19V Normal Replace Main No audio of Adaptor Voltage B/D or Repair parts Replace Adaptor...
  • Page 43 Standard Repair Process Error Symptom A. Video Error Established date 2016.01.29 LCD TV 3/14 Content Tuning fail, Picture broken/freezing Revised date . By using Digital signal level meter ☞ A5 . By using Diagnostics Setting on OSD Check RF Signal level ( Setting →...
  • Page 44 Standard Repair Process Error Symptom A. Video Error Established date 2016.01.29 LCD TV 4/14 Content Tuning fail, Picture broken/freezing Revised date Check RF signal cable (DVB satellite signal or not) ☞ A5 Check whether other equipments have problem or not. Check RF Signal level (By connecting RF Cable at other equipment) →...
  • Page 45 Standard Repair Process Error Symptom A. Video Error Established date 2016.01.29 LCD TV 5/14 Content Color error Revised date ☞ A8 / A9 ☞A7 Check and re place Link Ca Check color by input Color Color Color - External Input Replace Main B/D Replace module error...
  • Page 46 Standard Repair Process Error Symptom A. Video Error Established date 2016.01.29 LCD TV 6/14 Vertical/Horizontal bar, Residual Image, Content Revised date Light spot, External device Color error Vertical/Horizontal bar, residual image, light spot Replace Module ☞ A8/ A9 ☞A7 Check color condition by input Check external Check and rep Screen...
  • Page 47 Standard Repair Process Error Symptom B. Power Error Established date 2016.01.29 LCD TV 7/14 Content No power Revised date ☞A11 DC Power on Normal Replace M Check Power by pressing Power Key Operati ain B/D Power LED LED On On Remote control Stand-By : Red Check Adaptor/ Power cord...
  • Page 48 Standard Repair Process Error Symptom B. Power Error Established date 2016.01.29 LCD TV 8/14 Content Off when on/off while viewing, power auto on/off Revised date ☞A14 Check outlet Adaptor D Check Power Off Error Abnorm Replace Main B/D Normal C Out Mode or A/C cord Abnorm...
  • Page 49 Standard Repair Process Error Symptom C. Audio Error Established date 2016.01.29 LCD TV 9/14 Content No audio / Normal video Revised date ☞A15 Check user No audio Connection fro Replace Speaker Connec Screen normal m Main  Spe or Main B/D tion aker Cable Insert wafer SPK Cable...
  • Page 50 Standard Repair Process Error Symptom C. Audio Error Established date 2016.01.29 LCD TV 10/14 Content Wrecked audio / Discontinuation / Noise Revised date ☞A13 Check input si Wrecked Audio/ Check and replace gnal Signal Check Voltage 19V Discontinuation/ speaker and conne Normal of Adaptor Noise for all audio...
  • Page 51 Standard Repair Process Error Symptom D. Function Error Established date 2016.01.29 LCD TV 11/14 Content Remote control & Local switch checking Revised date Replace Main B/D ☞A16 ☞A16 ☞A16 Check & Repair Check R/C itself O Normal Normal Check 3.5V Normal Check IR Normal...
  • Page 52 Standard Repair Process Error Symptom D. Function Error Established date 2016.01.29 LCD TV 11/14 Content Wi-fi checking Revised date 3.Wifi operating error ☞A4 ☞A15 Check INSTART Wi-Fi Mac Check voltage 3.4V ST Normal menu Replace Main B/D “NG”? Voltage 1pin ☞A15 Close Check RF Cable...
  • Page 53 Standard Repair Process Error Symptom D. Function Error Established date 2016.01.29 LCD TV 12/14 Content External device recognition error Revised date Check technical in External Input and Check input Signal formation Technical Component Replace Main B/D signal Input - Fix information information Recognition error - S/W Version...
  • Page 54 Standard Repair Process Error Symptom E. Noise Established date 2016.01.29 LCD TV 13/14 Content Circuit noise, Mechanical noise Revised date Identify n Circuit Check locatio Replace Main Board ose type noise n of noise Mechanical Check location noise of noise ※...
  • Page 55 Standard Repair Process Error Symptom F. Exterior Defect Established date 2016.01.29 LCD TV 14/14 Content Exterior defect Revised date Zoom part with ex Module Replace module terior damage damage Cabinet Replace cabinet damage Remote Controller Replace remote controller damage Stand Replace stand damage...
  • Page 56 Contents of LCD TV Standard Repair Process Detail Technical Manual * First of all, Check whether there is SVC Bulletin in GCSC System for these model. Error symptom Content Page Remarks Check LCD back light with naked eye LED driver B+ measuring method A.
  • Page 57 Contents of LCD TV Standard Repair Process Detail Technical Manual * First of all, Check whether there is SVC Bulletin in GCSC System for these model. Error symptom Content Page Remarks Check front display LED Check power input Voltage & ST-BY 3.5V B.
  • Page 58 Standard Repair Process Detail Technical Manual Error Symptom A. Video Error, No Video/Normal Audio Established date 2016.01.29 LCD TV Content Check Back Light On with Naked eye Revised date Power On -> disjoint back case -> check lighting...
  • Page 59 Standard Repair Process Detail Technical Manual Error Symptom A. Video Error, No Video/Normal Audio Established date 2016.01.29 LCD TV Content Main Board to LED back light Voltage Revised date Measure DC Voltage applying to LED backlight from Main B/D...
  • Page 60 Standard Repair Process Detail Technical Manual Error Symptom A. Video Error, No Video/Normal Audio Established date 2016.01.29 LCD TV Content Check White Balance value Revised date 1. Press the ADJ button on the remote controller for adjustment 2. Enter into White Balance of item 11 3.
  • Page 61 Standard Repair Process Detail Technical Manual Error Symptom A. Video Error, No Video/Normal Audio Established date 2016.01.29 LCD TV Content Power Voltage Measuring Method Revised date HD Model : 27 ~ 30 pin FHD Model : 48 ~ 51 pin Check LVDS Voltage 12V...
  • Page 62 Standard Repair Process Detail Technical Manual Error Symptom A. Video Error, Video lag/stop Established date 2016.01.29 LCD TV Content Tuner Input Signal Strength Checking Method Revised date Setting  Channels Manual Tuning Select channel When the signal is strong, use the attenu ator (-10dB, -15dB, -20dB etc.)
  • Page 63 Standard Repair Process Detail Technical Manual Error Symptom A. Video Error, No Video/Normal Audio Established date 2016.01.29 LCD TV Content LCD-TV Version Checking Method Revised date Checking SW version method for remote controller for adjustment Press the IN-START with the remote co ntroller for adjustment...
  • Page 64 Standard Repair Process Detail Technical Manual A. Video Error, Vertical/Horizontal bar, Residual Image, Error Symptom Established date 2016.01.29 Light spot LCD TV Content LCD TV connection diagram Revised date As the part connecting to the external input, check the screen condition by signal * Jack spec.
  • Page 65 Standard Repair Process Detail Technical Manual Error Symptom A. Video Error, Color Error Established date 2016.01.29 LCD TV Content Check and replace Link Cable(LVDS) and contact condition Revised date 1. Check and replace LVDS Cable 2. Check LVDS connection condition...
  • Page 66 Standard Repair Process Detail Technical Manual Error Symptom A. Video Error, Color Error Established date 2016.01.29 LCD TV Content Adjustment Test Pattern – ADJ Key Revised date You can view 10 types of patterns using the ADJ Key Checking item : 1. Defective pixel 2.
  • Page 67 Appendix : Exchange T-Con Board (1) Solder defect, CNT Broken Solder defect, CNT Broken Solder defect, CNT Broken T-Con Defect, CNT Broken T-Con Defect, CNT Broken Abnormal Power Section Solder defect, CNT Broken Solder defect, CNT Broken T-Con Defect, CNT Broken Abnormal Power Section Solder defect, Short/Crack Solder defect, Short/Crack...
  • Page 68 Appendix : Exchange T-Con Board (2) Abnormal Power Section Abnormal Power Section Solder defect, Short/Crack Abnormal Display Fuse Open, Abnormal power section Solder defect, Short/Crack Noise GRADATION GRADATION...
  • Page 69 Appendix : Exchange the Module (1) Press damage Press damage Press damage Un-repairable Cases In this case please exchange the module. Crosstalk Crosstalk...
  • Page 70 Appendix : Exchange the Module (2) Vertical Line Vertical Block Vertical Block Source TAB IC Defect Source TAB IC Defect Source TAB IC Defect Horizontal Block Horizontal line Horizontal Block Gate TAB IC Defect Gate TAB IC Defect Gate TAB IC Defect Gate TAB IC Defect Gate TAB IC Defect Un-repairable Cases...
  • Page 71 Standard Repair Process Detail Technical Manual Error Symptom B. Power Error, No Power Established date 2016.01.29 LCD TV Content Check front Display LED Revised date ST-BY condition: Red Front LED control : Setting  Option  Standby Light  On/Off...
  • Page 72 Standard Repair Process Detail Technical Manual Error Symptom B. Power Error, No Power Established date 2016.01.29 A12/ LCD TV Content Checking Method When Power is ON Revised date Check Voltage 19V of Adaptor Power...
  • Page 73 Standard Repair Process Detail Technical Manual Error Symptom B. Power Error, Off when on, off whiling viewing Established date 2016.01.29 LCD TV Content Power off Mode checking method Revised date 1. Press the IN-START button of the remote controller for adjustment 2.
  • Page 74 Standard Repair Process Detail Technical Manual Error Symptom D. Function Error, No Response in remote controller, Key error Established date 2016.01.29 LCD TV Content Remote controller operation checking method Revised date P4001 KEY1/KEY2　 ③ +3.4V_ST LED_R IR　 ② ① < Sub Ass’y> <...
  • Page 75 Standard Repair Process Detail Technical Manual Error Symptom C. Audio Error, No Audio/Normal Video Established date 2016.01.29 LCD TV Content Checking method in Setting when there is no audio Revised date P4001 ③ +3.4V_WIFI WIFI_DM WIFI_DP WOL/WIFI_POWER_ON wifi ② ① <...

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