LG 43LH54 Series Service Manual
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LG 43LH54 Series Service Manual

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LED TV
SERVICE MANUAL
CHASSIS : LD67T
MODEL : 43/49LH54**
CAUTION
BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
P/NO : MFL69473201 (1603-REV01)
Internal Use Only
43/49LH54**-ZA/ZD

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  • Page 1 Internal Use Only LED TV SERVICE MANUAL CHASSIS : LD67T MODEL : 43/49LH54** 43/49LH54**-ZA/ZD CAUTION BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. P/NO : MFL69473201 (1603-REV01)
  • Page 2 ADJUSTMENT INSTRUCTION ............. 10 BLOCK DIAGRAM ................. 16 EXPLODED VIEW .................. 17 ASSEMBLY / DISASSEMBLY ............... 18 TROUBLE SHOOTING GUIDE ..........APPENDIX - 2 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 3 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 - 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 TELSAT-W2A, HOTBIRD 6/8/9, EUTELSAT-SESAT, ASTRA 1L/H/M/KR, ASTRA 3A/3B, BADR 4/6, ASTRA 2D, EUROBIRD 3, EUTELSAT-W7, HEL- LASSAT 2, EXPRESS AM1, TURKSAT 2A/3A, INTERSAT10 - 6 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 7 CI + : Germany (Astra HD+) Ethernet (1EA) Wired, DMP only Only UK T2 Model (LH54/LH51/LH52/LH53) : for MHEG - 7 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 8 HDTV 1080P 1920*1080 26.97 23.94 74.176 HDTV 1080P 1920*1080 33.75 30.00 74.25 HDTV 1080P 1920*1080 33.71 29.97 74.176 HDTV 1080P - 8 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 9 Pixel clock(MHz) Proposed 3D input proposed mode 1920*1080 33.75 74.25 HDTV 1080P Side by Side, Top & Bottom, JPS, MPO(Photo) - 9 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 10 (2) Select "Adjust Check" and Push “OK” button. (3) Push in the number. (Each of models has their number) (4) Completed selecting Tool option. - 10 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 11 MODEL NAME MODEL NAME(HEX) LG TV 00 00 00 FC 00 4C 47 20 54 56 0A 20 20 20 20 20 20 20 (LG TV) * ASCII Code Caution : Never connect HDMI cable when EDID downloaded. - 11 - Copyright ©...
  • Page 12 Warm Cool Warm (±0.002) Y=0.339 R Gain Y=0.329 (±0.002) G Gain B Gain R Cut G Cut B Cut - 12 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 13 Tool option and Area option value with its BOM, if it is correctly same then unplug the AC cable. - 13 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 14 (only use this one.) always) There is impossible to download by bar code scan, so It need Manual download. - 14 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 15 ▪ Setting automatic IP ▪ Setting state confirmation - If automatic setting is finished, you confirm IP and MAC Address. - 15 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 16 BLOCK DIAGRAM 1. EU/CIS : T2/C/S2 : Model LH54/LH53 : LD67T - 16 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 17 Shock, Fire, or other Hazards. Do not modify the original design without permission of manufacturer. - 17 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 18 ② 3*5.5, SCREW TORQUE : 4 ~ 7Kgf.cm ③,⑤ 4*10, SCREW TORQUE : 5 ~ 7Kgf.cm Rear Cover Fix JOYSTICK Assembly JOYSTICK and 10P HARNESS - 18 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 19 1. Remove the Screw 2. Disassemble Joy Stick Cover 3. Remove the Screw 4. Disassemble rear cover Rear Cover - 19 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 20 3*5.5, SCREW TORQUE : 4 ~ 7Kgf.cm 4*10, SCREW TORQUE : 5 ~ 7Kgf.cm Fix JOYSTICK Remove 10P HARNESS Assembly JOYSTICK and 10P HARNESS - 20 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 21 10P HARNESS 1. Remove the Screw 2. Disassemble Joy Stick Cover 3. Remove the Screw 4. Disassemble rear cover - 21 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 23 TROUBLE SHOOTING GUIDE LGE Internal Use Only Copyright ⓒ 2016 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 24: Table Of Contents

    Remote control & Local switch checking D. Function error External device recognition error E. Noise Circuit noise, mechanical noise F. Exterior error Exterior defect LGE Internal Use Only Copyright ⓒ 2016 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 25: No Video/Normal Audio

    Always check & record S/W Version and White Replace Main Board Re-enter White Balance value Balance value before replacing the Main Board LGE Internal Use Only Copyright ⓒ 2016 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 26: No Video/No Audio

    ☞A13 No video / Check voltage 19V Normal Replace Main No audio of Adaptor Voltage B/D or Repair parts Replace Adaptor LGE Internal Use Only Copyright ⓒ 2016 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 27: Tuning Fail, Picture Broken/Freezing

    2. Install Booster Replace S/W Upgrade Normal Contact with signal distributor Main B/D Picture or broadcaster (Cable or Air) Normal Picture LGE Internal Use Only Copyright ⓒ 2016 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 28 Contact with signal S/W Upgrade Replace satellite setting distributor (match with installed ANT) or broadcaster (Cable or Air) Normal Normal Picture Picture LGE Internal Use Only Copyright ⓒ 2016 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 29: Color Error

    Check external device/ Check Test pattern Component, device and Replace Main B/D Cable HDMI cable Normal error Request repair for external device/cable LGE Internal Use Only Copyright ⓒ 2016 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 30: Vertical/Horizontal Bar, Residual Image, Light Spot

    HDMI by connecting HDMI) Jig, pattern Generator, Set-top Box etc. S/W Upgrade Request repair for external device Normal Screen LGE Internal Use Only Copyright ⓒ 2016 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 31: No Power

    Power cord was inserted properly Power LED On ※ ☞A16 Normal Check ST-BY 3.5V Voltage Replace Adaptor or Replace Main B/D LGE Internal Use Only Copyright ⓒ 2016 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 32: Off When On/Off While Viewing, Power Auto On/Off

    Power off by unknown status except listed case Power off by abnormal status except CPU trouble "POWEROFF_ABNORMAL1" Abnormal Power off by CPU Abnormal "POWEROFF_CPUABNORMAL" LGE Internal Use Only Copyright ⓒ 2016 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 33: No Audio/Normal Video

    Connection Replace Speaker Connec Screen normal from Main  or Main B/D tion Speaker Cable Insert wafer SPK Cable Normal Audio LGE Internal Use Only Copyright ⓒ 2016 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 34: Wrecked Audio/Discontinuation/Noise

    Request repair to external Audio cable/ANT provider (In case of External Input Check and fix external device signal error) Check and fix external device LGE Internal Use Only Copyright ⓒ 2016 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 35: Remote Control & Local Switch Checking

    Baterry of R/C in room If R/C operate, Explain the customer Normal cause is interference Operating from light in room. Replace R/C LGE Internal Use Only Copyright ⓒ 2016 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 36: External Device Recognition Error

    - Fix information information Recognition error - S/W Version Fix in Check and fix accordance HDMI external device/cable with technical Recognition error information LGE Internal Use Only Copyright ⓒ 2016 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 37: Circuit Noise, Mechanical Noise

    “Part related to nose” in the Owner’s Manual. (For models without any fix information, provide the description) LGE Internal Use Only Copyright ⓒ 2016 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 38: Exterior Defect

    Zoom part with Module Replace module exterior damage damage Cabinet Replace cabinet damage Remote Control Replace remote control damage Stand Replace stand damage LGE Internal Use Only Copyright ⓒ 2016 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 39 Exchange LED driver Board (PSU) A-3/5 Defected Type caused by T-Con/ Inverter/ Module Exchange Module itself (1) A-4/5 Exchange Module itself (2) A-5/5 LGE Internal Use Only Copyright ⓒ 2016 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 40 C. Audio error_No audio/Normal video audio D. Function error_ No response in remote remote control operation checking method control, key error LGE Internal Use Only Copyright ⓒ 2016 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 41 Established date Content Check Back Light On with Naked eye Revised date Power On -> disjoint back case -> check lighting LGE Internal Use Only Copyright ⓒ 2016 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 42 Established date Content Main Board to LED back light Voltage Revised date Measure DC Voltage applying to LED backlight from Main B/D LGE Internal Use Only Copyright ⓒ 2016 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 43 3. After recording the R, G, B (GAIN, Cut) value of Color Temp (Cool/Medium/Warm), re-enter the value after replacing the MAIN BOARD LGE Internal Use Only Copyright ⓒ 2016 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 44 Power Voltage Measuring Method Revised date HD Model : 27 ~ 30 pin FHD Model : 48 ~ 51 pin Check LVDS Voltage 12V LGE Internal Use Only Copyright ⓒ 2016 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 45 Setting  Programmes  signal test  Select channel When the signal is strong, use the attenuator (-10dB, -15dB, -20dB etc.) LGE Internal Use Only Copyright ⓒ 2016 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 46 Version Checking Method Revised date Checking SW version method for remote control for adjustment Press the IN-START with the remote control for adjustment LGE Internal Use Only Copyright ⓒ 2016 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 47 As the part connecting to the external input, check the screen condition by signal * Jack spec. : depending on Model LGE Internal Use Only Copyright ⓒ 2016 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 48 Check and replace Link Cable(LVDS) and contact condition Revised date 1. Check and replace LVDS Cable 2. Check LVDS connection condition LGE Internal Use Only Copyright ⓒ 2016 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 49 Checking item : 1. Defective pixel 2. Residual image 3. MODULE error (ADD-BAR,SCAN BAR..) 4.Video error (Classification of MODULE or Main-B/D) LGE Internal Use Only Copyright ⓒ 2016 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 50 Solder defect, CNT Broken Solder defect, CNT Broken T-Con Defect, CNT Broken Abnormal Power Section Solder defect, Short/Crack Solder defect, Short/Crack LGE Internal Use Only Copyright ⓒ 2016 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 51 Abnormal Power Section Abnormal Power Section Solder defect, Short/Crack Abnormal Display Fuse Open, Abnormal power section Solder defect, Short/Crack Noise GRADATION GRADATION LGE Internal Use Only Copyright ⓒ 2016 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 52 Appendix : Exchange the Module (1) Press damage Press damage Press damage Un-repairable Cases In this case please exchange the module. Crosstalk Crosstalk LGE Internal Use Only Copyright ⓒ 2016 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 53 Gate TAB IC Defect Un-repairable Cases In this case please exchange the module. Horizontal Block Gate TAB IC Defect Gate TAB IC Defect LGE Internal Use Only Copyright ⓒ 2016 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 54 Check front Display LED Revised date ST-BY condition: Red Front LED control : Setting  Option  Standby Light  On/Off LGE Internal Use Only Copyright ⓒ 2016 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 55 B. Power Error, No Power Established date A12/ Content Checking Method When Power is ON Revised date Check Voltage 19V of Adaptor Power LGE Internal Use Only Copyright ⓒ 2016 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 56 Revised date 1. Press the IN-START button of the remote control for adjustment 2. Check the entry into adjustment item 3 LGE Internal Use Only Copyright ⓒ 2016 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 57 Established date Content Checking method in Setting when there is no audio Revised date Check Connection from Main B/D to Speaker LGE Internal Use Only Copyright ⓒ 2016 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 58 4. When checking the Pre-Amp when the power is in ON condition, it is normal when the Analog Tester needle moves slowly, and defective when it does not move at all. LGE Internal Use Only Copyright ⓒ 2016 LG Electronics. Inc. All right reserved. Only for training and service purposes...

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