LG 32LF550U Service Manual
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LG 32LF550U Service Manual

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LED TV
SERVICE MANUAL
CHASSIS : LD55T
MODEL : 32LF550U
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
P/NO : MFL68646111 (1503-REV00)
North/Latin America
Europe/Africa
Asia/Oceania
32LF551C
Internal Use Only
http://aic.lgservice.com
http://eic.lgservice.com
http://biz.lgservice.com
32LF550U-ZA
32LF551C-ZA
Printed in Korea

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Summary of Contents for LG 32LF550U

  • Page 1 Internal Use Only North/Latin America http://aic.lgservice.com Europe/Africa http://eic.lgservice.com Asia/Oceania http://biz.lgservice.com LED TV SERVICE MANUAL CHASSIS : LD55T MODEL : 32LF550U 32LF550U-ZA 32LF551C 32LF551C-ZA CAUTION BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. P/NO : MFL68646111 (1503-REV00) Printed in Korea...

  • Page 2: Table Of Contents

    ADJUSTMENT INSTRUCTION ............. 11 BLOCK DIAGRAM ................. 17 EXPLODED VIEW .................. 21 SCHEMATIC CIRCUIT DIAGRAM ........... APPENDIX TROUBLE SHOOTING GUIDE ..........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

    HOTBIRD 6/8/9, EUTELSAT-SESAT, ASTRA 1L/H/M/ KR, ASTRA 3A/3B, BADR 4/6, ASTRA 2D, EUROBIRD 3, EUTELSAT-W7, HELLASSAT 2, EXPRESS AM1, TURK- SAT 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) DLNA(Wired, DMP only) Only UK T2 Model (LF57/LF56/LF55/LF54) : 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 HDTV 1080P 1920*1080 26.97 23.97 74.175 HDTV 1080P 1920*1080 33.75 30.00 74.25 HDTV 1080P 1920*1080 33.71 29.97 74.175 HDTV 1080P - 9 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 10: Hdmi Input

    74.25 HDTV 1080P MPO(Photo) 6.4. 3D Input mode Side by Side Top & Bottom Single Frame Sequential Frame Packing - 10 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 11: Adjustment Instruction

    In this case, you have to channel recover. if all channel data is cleared, you didn’t have a DTV/ ATV test on production line. - 11 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 12 MODEL NAME(HEX) control, power on TV. LG TV 00 00 00 FC 00 4C 47 20 54 56 0A 20 20 20 20 20 20 20 (LG TV) * ADC Calibration Protocol (RS232) e. Checksum: Changeable by total EDID data.
  • Page 13 C0.(When R/G/B Gain are all Over 120 C0, it is the FULL Dynamic Range of Module) - 13 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 14 ■ When pressing IN-STOP key by SVC remocon, Red LED are blinked alternatively. And then automatically turn off. (Must not AC power OFF during blinking) - 14 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 15 Data : Write data CS : CMD + LENGTH + ADH + ADL + Data_1 +...+ Data_n Delay : 20ms - 15 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 16 ▪ Check the OK or NG (3) Play Test (F9) button and confirm OK Message. (4) Remove LAN cable. - 16 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 17: Block Diagram

    BLOCK DIAGRAM 1. CIS T2/C/S2 3D Model - 17 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 18 2. CIS T2/C/S2 2D Model - 18 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 19 3. EU T2/C/S2 2D Model - 19 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 20 4. EU T/C 2D Model - 20 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 21: Exploded View

    Shock, Fire, or other Hazards. Do not modify the original design without permission of manufacturer. - 21 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 22 140826 ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR POWER THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. LGE Internal Use Only Copyright © 2015 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 23 2014/05/20 ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR USB_S1 THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. LGE Internal Use Only Copyright © 2015 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 24 FIRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR HDMI_R1S1 THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. LGE Internal Use Only Copyright © 2015 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 25 2014/06/02 ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR SPDIF THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. LGE Internal Use Only Copyright © 2015 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 26 L14_CA_M1A 2014/06/13 ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. LGE Internal Use Only Copyright © 2015 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 27 140721 ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR S_FLASH THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. LGE Internal Use Only Copyright © 2015 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 28 140613 ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR LVDS THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. LGE Internal Use Only Copyright © 2015 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 29 2014/06/25 ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. PCMCI_EU LGE Internal Use Only Copyright © 2015 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 © 2015 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 THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. LGE Internal Use Only Copyright © 2015 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 32 ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. SCART_ COMPONENT LGE Internal Use Only Copyright © 2015 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 33 2014/05/22 ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR HEAD_PHONE THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. LGE Internal Use Only Copyright © 2015 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 34 2014/05/22 ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR TUNER_T2CS2 THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. LGE Internal Use Only Copyright © 2015 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 35 2014/05/22 ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR RS232C_MSTAR_DEBUG_4P THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. LGE Internal Use Only Copyright © 2015 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 36 FIRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR TP_EU THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. LGE Internal Use Only Copyright © 2015 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 37 2014/06/02 ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR IR_EYE_SENSOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. LGE Internal Use Only Copyright © 2015 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 38 L14_CA_M1A ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. MAIN1_EU LGE Internal Use Only Copyright © 2015 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 39 2014/11/18 ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR MAIN2_EU THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. LGE Internal Use Only Copyright © 2015 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 40 FIRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR 1AMP_TAS THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. LGE Internal Use Only Copyright © 2015 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 41 140815 ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR MHL_SW_AND THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. LGE Internal Use Only Copyright © 2015 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 43 Trouble shooting guided Copyright © 2015 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 44 Remote control & Local switch checking D. Function error External device recognition error E. Noise Circuit noise, mechanical noise F. Exterior error Exterior defect Copyright © 2015 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 45 Always check & record S/W Version and White Replace Main Board Re-enter White Balance value Balance value before replacing the Main Board Copyright © 2015 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 46 No video / Normal voltages of Power replace No audio Voltage Board ( 13.2V) MAIN B/D Replace Power Board and repair parts Copyright © 2015 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 47 2. Install Booster Normal Replace Contact with signal distributor S/W Upgrade Picture or broadcaster (Cable or Air) Main B/D Normal Picture Copyright © 2015 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 48 Contact with signal Change satellite setting S/W Upgrade distributor (match with installed ANT) or broadcaster (Cable or Air) Normal Normal Picture Picture Copyright © 2015 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 49 Normal error cable Request repair for external device/cable Check external External HDMI device and Replace Main B/D device/Cable error cable Normal Copyright © 2015 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 50 (Check normal operation of External Input, HDMI Screen Replace error Component, HDMI by normal Main B/D connecting Jig, pattern Generator ,Set-top Box etc. Copyright © 2015 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 51 Measure voltage of each output of Power B/D Normal ☞A12 ※ Normal Normal Check ST-BY 3.5V Replace Main B/D Voltage Voltage Replace Power B/D Replace Power B/D Copyright © 2015 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 52 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" Copyright © 2015 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 53  Sound Out Select TV Speaker Replace Power Board and repair parts Check Disconn Speaker Replace Main Board ection connection Replace Speaker Copyright © 2015 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 54 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 Copyright © 2015 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 55 (Power B/D don’t have problem) If R/C operate, Normal Explain the customer Operating cause is interference from light in room. Replace R/C Copyright © 2015 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 56 - S/W Version Fix in accordance HDMI, Optical Check and fix Replace Main B/D with technical Recognition error external device/cable information Copyright © 2015 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 57 “Part related to nose” in the Owner’s Manual. (For models without any fix information, provide the description) Copyright © 2015 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 58 Zoom part with Module Replace module exterior damage damage Cabinet Replace cabinet damage Remote Controller Replace remote controller damage Stand Replace stand damage Copyright © 2015 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 59 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 Copyright © 2015 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 60 Voltage and speaker checking method in case of audio/discontinuation audio error D. Function error_ No response in remote Remote controller operation checking method controller, key error Copyright © 2015 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 61 Error symptom date Revised Content Check Back Light On with naked eye date Power On -> disjoint back case -> check lighting Copyright © 2015 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 62 1. Measure DC Voltage applying to LED backlight from Power Board. 2. Output DC Voltage from Power Board -> supply to LED backlight. Check Pin contacting statement and connection statement. Copyright © 2015 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 63 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. Copyright © 2015 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 64 Check D.13.2V , A13.2V (4 ~8 PIN) 12 Pin (Power Board ↔ Main Board) SMH200-H12S4 Power on PDIM#2 D.13.2V D.13.2V D.13.2V A.13.2V A.13.2V DRV_ON PDIM#1 Copyright © 2015 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 65 MENU  Press red key Remote controller  signal test  Select channel When the signal is strong, use the attenuator (-10dB, -15dB, -20dB etc.) Copyright © 2015 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 66 LCD-TV Version checking method Content date Checking SW version method for remote controller for adjustment Press the IN-START with the remote controller for adjustment Copyright © 2015 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 67 Content LCD TV connection diagram (1) date As the part connecting to the external input, check the screen condition by signal Copyright © 2015 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 68 Content Check and replace Link Cable(LVDS) and contact condition date 1. Check and replace LVDS Cable 2. Check LVDS connection condition Copyright © 2015 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 69 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) Copyright © 2015 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 70 Solder defect, CNT Broken Solder defect, CNT Broken T-Con Defect, CNT Broken Abnormal Power Section Solder defect, Short/Crack Solder defect, Short/Crack Copyright © 2015 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 71 Abnormal Power Section Abnormal Power Section Solder defect, Short/Crack Abnormal Display Fuse Open, Abnormal power section Solder defect, Short/Crack Noise GRADATION GRADATION Copyright © 2015 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 72 Panel Mura, Light leakage Press damage Crosstalk Press damage Crosstalk Un-repairable Cases In this case please exchange the module. Press damage Copyright © 2015 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 73 Gate TAB IC Defect Un-repairable Cases In this case please exchange the module. Horizontal Block Gate TAB IC Defect Gate TAB IC Defect Copyright © 2015 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 74 Check front display LED Content date ST-BY condition: Red Front LED control : Menu  Option  Standby Light  On/Off Copyright © 2015 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 75 Check D.13.2V (4,5,6 PIN) 12 Pin (Power Board ↔ Main Board) SMH200-H12S4 Power on PDIM#2 D.13.2V D.13.2V D.13.2V A.13.2V A.13.2V DRV_ON PDIM#1 Copyright © 2015 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 76 Check “power on(Pin 1)” pin is high(about 3.3V) 12 Pin (Power Board ↔ Main Board) SMH200-H12S4 Power on PDIM#2 D.13.2V D.13.2V D.13.2V A.13.2V A.13.2V DRV_ON PDIM#1 Copyright © 2015 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 77 Checking order 1. Press the IN-START button of the remote controller for adjustment 2. Check the entry into adjustment item 3. Copyright © 2015 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 78 1. Press the MENU button on the remote controller 2. Select the AUDIO function of the Menu 3. Select TV Speaker Check Copyright © 2015 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 79 3. Connect the tester RX1 to the speaker terminal and if you hear the Chik Chik sound when you touch the GND and output terminal, the speaker is normal. Copyright © 2015 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 80 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. Copyright © 2015 LG Electronics. Inc. All rights reserved. Only for training and service purposes...

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