LG 55LV550Y Service Manual
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LG 55LV550Y Service Manual

LG 55LV550Y Service Manual

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LED LCD TV
SERVICE MANUAL
CHASSIS : LB12E
MODEL : 55LV5500
MODEL :
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
P/NO : MFL67007012 (1103-REV00)
North/Latin America
Europe/Africa
Asia/Oceania
55LV550Y
Internal Use Only
http://aic.lgservice.com
http://eic.lgservice.com
http://biz.lgservice.com
55LV5500-TA
55LV550Y-TA
Printed in Korea

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  • Page 1 Europe/Africa http://eic.lgservice.com Asia/Oceania http://biz.lgservice.com LED LCD TV SERVICE MANUAL CHASSIS : LB12E MODEL : 55LV5500 55LV5500-TA MODEL : 55LV550Y 55LV550Y-TA CAUTION BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. P/NO : MFL67007012 (1103-REV00) Printed in Korea...
  • Page 2 SPECIFICATION ..................4 ADJUSTMENT INSTRUCTION ..............8 DISASSEMBLY ..................15 EXPLODED VIEW .................. 17 SCHEMATIC CIRCUIT DIAGRAM .............. Copyright © 2011 LG Electronics. Inc. All rights reserved. - 2 - 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. Copyright © 2011 LG Electronics. Inc. All rights reserved. - 3 - LGE Internal Use Only Only for training and service purposes...

  • Page 4: Specification

    AV1,2 SDPIF out (1EA) SPDIF out USB (2EA) EMF, DivX HD, For SVC(download) JPEG, MP3, DivX HD Plus Copyright © 2011 LG Electronics. Inc. All rights reserved. - 4 - LGE Internal Use Only Only for training and service purposes...

  • Page 5: Component Video Input

    29.976 /30.00 74.25 HDTV 1080P 1920*1080 56.250 148.5 HDTV 1080P 1920*1080 67.43 /67.5 59.94 /60 148.35/148.50 HDTV 1080P Copyright © 2011 LG Electronics. Inc. All rights reserved. - 5 - LGE Internal Use Only Only for training and service purposes...
  • Page 6 Single Frame Sequential 1920*1080 56.250 148.5 HDTV 1080P Side by Side, Top & Bottom, Checkerboard Single Frame Sequential Copyright © 2011 LG Electronics. Inc. All rights reserved. - 6 - LGE Internal Use Only Only for training and service purposes...

  • Page 7: Usb Input

    Side by Side Top & Bottom Checkerboard Single Frame Sequential Frame Packing 2D to 3D 2D to 3D Copyright © 2011 LG Electronics. Inc. All rights reserved. - 7 - LGE Internal Use Only Only for training and service purposes...

  • Page 8: Adjustment Instruction

    - Pattern level : 0.7 ± 0.1 Vp-p Connect: PCBA Jig-> RS-232C Port== PC-> RS-232C Port - Image Copyright © 2011 LG Electronics. Inc. All rights reserved. - 8 - LGE Internal Use Only Only for training and service purposes...
  • Page 9 (3) WIDEVINE key Inspection is mandatory by D-book 4.0. - Confirm key input data at the “IN START” MENU Mode. Copyright © 2011 LG Electronics. Inc. All rights reserved. - 9 - LGE Internal Use Only Only for training and service purposes...

  • Page 10: Manual Adjustment

    6) If ADC calibration is failure, after recheck ADC pattern or condition retry calibration Error message refer to 5). Copyright © 2011 LG Electronics. Inc. All rights reserved. - 10 - LGE Internal Use Only Only for training and service purposes...

  • Page 11: White Balance Adjustment

    - VAL: FOS Data value - CS: Checksum of sent data - A: Acknowledge Ex) [Send: JA_00_DD] / [Ack: A_00_okDDX] Copyright © 2011 LG Electronics. Inc. All rights reserved. - 11 - LGE Internal Use Only Only for training and service purposes...
  • Page 12 W/B Adj. must begin as start command “wb 00 00” , and finish as end command “wb 00 ff”, and Adj. offset if need. Copyright © 2011 LG Electronics. Inc. All rights reserved. - 12 - LGE Internal Use Only...
  • Page 13 3) You must remove the pairing with the TV Set by select ‘OK’ Key + ‘Mute’ key on the adjustment remote control for 5 seconds. Fig.3 Connect the Dongle Copyright © 2011 LG Electronics. Inc. All rights reserved. - 13 - LGE Internal Use Only Only for training and service purposes...
  • Page 14 • LEAKAGE CURRENT: At 0.5 mArms 2) Select “Tool Option 1” and push “OK” key. 3) Punch in the number. (Each model has their number.) Copyright © 2011 LG Electronics. Inc. All rights reserved. - 14 - LGE Internal Use Only...
  • Page 15 Disassemble 1 screw which bind Main Board and Back Detach Power cord Cover from the Back cover. cover. Copyright © 2011 LG Electronics. Inc. All rights reserved. - 15 - LGE Internal Use Only Only for training and service purposes...
  • Page 16 Remove the Back cover. from Main board. Push the Panel aside and bend Cabinet back. Take the Panel out of Cabinet by detaching latch. Copyright © 2011 LG Electronics. Inc. All rights reserved. - 16 - LGE Internal Use Only...

  • Page 17: Exploded View

    X-RADIATION, Shock, Fire, or other Hazards. Do not modify the original design without permission of manufacturer. Copyright LG Electronics. Inc. All rights reserved. - 17 - LGE Internal Use Only Only for training and service purposes...
  • Page 18 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. MAIN & NAND FLASH Copyright © 2011 LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 19 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. MAIN POWER Copyright © 2011 LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 20 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR MAIN AUDIO/VIDEO THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. Copyright © 2011 LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 21 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR MAIN DDR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. Copyright © 2011 LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 22 BCM35230 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. MICOM Copyright © 2011 LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 23 BCM35230 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. HDMI Copyright © 2011 LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 24 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR COMMON JACK THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. Copyright © 2011 LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 25 BCM35230 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR IR/KEY THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. Copyright © 2011 LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 26 BCM35230 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR WIRELESS THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. Copyright © 2011 LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 27 BCM35230 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR COMP/AV THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. Copyright © 2011 LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 28 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR USB + WIFI THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. Copyright © 2011 LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 29 BCM35230 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR M_REMOCON THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. Copyright © 2011 LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 30 BCM35230 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR ETHERNET THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. Copyright © 2011 LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 31 FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR LVDS THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. Copyright © 2011 LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 32 FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR L_DIMMING THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. Copyright © 2011 LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 33 BCM35230 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. AUDIO[NEO] Copyright © 2011 LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 34 2010.11.11 BCM35230 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. Copyright © 2011 LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 35 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR TUNER SINGLE THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. Copyright © 2011 LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 36 FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. Copyright © 2011 LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 37 BCM35230 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR SCART THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. Copyright © 2011 LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 38 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR NON CHB THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. Copyright © 2011 LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 39 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR CHINA HOTEL THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. Copyright © 2011 LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 40 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR NON URSA THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. Copyright © 2011 LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 41 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR SMD GASKET THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. Copyright © 2011 LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 42 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR TUNER SMD GASKET THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. Copyright © 2011 LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 43 FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR POWER THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. Copyright © 2011 LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 45: Encoding Format

    3D Encoding Format Copyright © 2011 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...

  • Page 46: Only For Training And Service Purposes

    R : 1920x1080p/30Hz R : MPEG-4 MVC R : 1920x1080p/30Hz R : 1920x1080p/30Hz HDMI 1.4 HDMI 1.4 L : 1920x1080p/60Hz R : 1920x1080p/60Hz Copyright © 2011 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 47 Component board BD Player LG5811 LG1131A LG1121 (XTR 240Hz Panel (2D to 3D) (FRC2) T-con) Mini LVDS HDMI 1.3/ HDMI 1.4 Copyright © 2011 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 48 R close R close R open R close Big Crosstalk because of driving system The duration without crosstalk can be made Copyright © 2011 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 49 Backlight blinking and Shutter glasses 3D sync LEFT OPEN RIGHT OPEN Backlight signal Don’t need to control open time in Glasses Copyright © 2011 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 50 Backlight Scanning and Glasses 3D sync LEFT OPEN RIGHT OPEN Backlight Scanning signal Don’t need to control open time in Glasses Copyright © 2011 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 51 P-GAMMA P_VCOM (MAX9668B) (MAX9668B) I2C_SDA I2C_SDA (MAX9668B) (MAX9668B) (0xE8) (0xEA) (0xE8) (0xEA) Z_OUT 80P mini-LVDS Output 80P mini-LVDS Output RIGHT LEFT Copyright © 2011 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...

  • Page 52: Bcm35230

    +12VD +1.5V +1.26V_FRC LDO Regulator DC-DC Converter LDO Regulator DC-DC Converter (AP7173-SPG-13) (AOZ1072AI) (AP7173-SPG-13) (AOZ1072AI) 51Pin LVDS output 41Pin LVDS output Copyright © 2011 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 53 4. Formatter PCB for BroadBand 5. Block Diagram 6. Inner Connection 7. Repair Process (Troubleshooting) JAN. 13 , 2011 LG Electronics/ LCD TV By M.R.VIJAYSHANKAR Copyright © 2011 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...

  • Page 54: Local Dimming

    42inch : H(12) * V(4) = 48Block Dimming 47inch : H(12) * V(5) = 60Block 55inch : H(16) * V(6) = 96Block Copyright © 2011 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 55 42inch : H(2) * V(8) = 16Block Dimming 47inch : H(2) * V(8) = 16Block 55inch : H(2) * V(8) = 16Block Copyright © 2011 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 56 HDMI Switch IC Analog Demod LGT10 Scanning B/L ON/OFF Scart Count None Audio Amp. NTP2AMP Display Port Backlight Tyype ALEF_LED/ ALEF_LGD Copyright © 2011 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 57 17592 8789 STD B/L : 60 55LV5500-TA 33003 3327 17592 8789 STD B/L : 65 55LV5500-TA 37099 3327 17592 8917 (AUO) Copyright © 2011 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 58 2. Area Option Information Copyright © 2011 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...

  • Page 59: Main Features

    Main processor, DDR Memory, Flash Memory Voltage (5V/3.3V/0.9V) Voltage (2.5V/1.5V) Voltage (1.25V) HDMI switch (4:1) Audio AMP (Main) Audio AMP (Woofer) USB switch (2:1) NEC MICOM Copyright © 2011 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 60 To Formatter Board To inner WiFi Assy (Only LW9500) To IR + Soft Touch Assy To Motion Remocon Receiver (RF Module) Copyright © 2011 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 61 To LED Driver Board (Master) To LCD Module (LVDS 240Hz Cable) To LCD Module (LVDS 240Hz Cable) To LED Driver Board (Slave) Copyright © 2011 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 62 Main processor, DDR Memory, Flash Memory Voltage (5V/3.3V/0.9V) Voltage (2.5V/1.5V) Voltage (1.25V) HDMI switch (4:1) Audio AMP (Main) NEC MICOM URSA5 EXTERNAL FRC Copyright © 2011 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 63 To Power Board (Local Dimming) To Power Board To Speaker To Module 41P To Module 51P To IR + Soft Touch Assy Copyright © 2011 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 64 Wireless Ready PC-RGB RGB,H/V side L/R In PC-AUDIO OPTIC SPDIF OUT M-Remote Module UART Ethernet (built in) Only LW9500/7700 A/V1 Rear RS-232C Copyright © 2011 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 65 A/V1 CVBS COMP COMP1 Sub Micom (NEC) Rear Wireless Ready PC-RGB RGB,H/V L/R In PC-AUDIO OPTIC SPDIF OUT UART Ethernet RS-232C Copyright © 2011 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...

  • Page 66: Block Diagram

    PC L,R [AV1_CVBS_IN] CVBS [AV1_CVBS_DET] AV DET HDMI1 [AV1_R_IN] HDMI2 HDMI [AV1_L_IN] HUB IC [HDMI0_-/+] HDMI3 [AV1_CVBS_IN] CVBS HDMI4 [AV1_CVBS_DET] AV DET Copyright © 2011 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 67 LED BLU control Vsync RF Emitter Active Type Display * For more information about 3D system, refer to the page 1 ~6 Copyright © 2011 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 68 Formatter to LCD Module Main to Woofer Main to IR+Soft Touch Main to Speaker Power to LED Driver LED Driver to LCD Module Copyright © 2011 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 69 Main to Motion Receiver (RF Module) Formatter to LCD Module Main to Woofer Main to IR Main to Speaker Power to LED Driver Copyright © 2011 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 70 Soft Touch + IR Key PCB RF MOTION ASSY SPK unit WIFI ASSY Soft Touch RF MOTION ASSY WIFI ASSY IR Key PCB To Main Copyright © 2011 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 71 47/55LW7700 IR PCB Control Key PCB SPK unit RF MOTION ASSY IR Key PCB Control key RF MOTION ASSY To Main Copyright © 2011 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 72 Main / PSU cable T-con Driver Main / Module LVDS cable 41&51PIN LED driver / PSU 15Pin (IR+Touch) Cable SPK Cable Local Dimming Cable Copyright © 2011 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 73 Main / PSU cable T-con Driver Main / Module LVDS cable 41&51PIN LED driver / PSU 15Pin (IR+Touch) Cable SPK Cable Local Dimming Cable Copyright © 2011 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 74 LED driver / PSU 15Pin (IR+Touch) Cable Same interconnection LW or LV serise SPK Cable in the 42”/47” Local Dimming Cable Copyright © 2011 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 75 (LV/LW570) LV/LW57 Serise IR & Soft touch Key PCB (LV/LW570 only IR Assy) LW65 serise LV/LW55 Serise LV/LW57 Serise To Main Copyright © 2011 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 76 Circuit noise, mechanical noise F. Exterior error Exterior defect First of all, Check whether there is SVC Bulletin in GCSC System for these model. Copyright © 2011 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 77 Always check & record S/W Version and White Replace Main Board Re-enter White Balance value Balance value before replacing the Main Board Copyright © 2011 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 78 Power No Video/ replace voltage? Board ( 3.5V,12V,20V No audio MAIN B/D or 24V…) Replace Power Board and repair parts Copyright © 2011 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 79 Check Normal Contact with signal distributor Tuner soldering Picture? or broadcaster (Cable or Air) Normal Picture? Replace Main B/D Close Close Copyright © 2011 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 80 Change satellite setting signal distributor Normal (match with installed ANT) or broadcaster Picture? (Cable or Air) Normal Picture? Close Close Close Copyright © 2011 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 81 Request repair for external device/cable RGB/ Check external External device HDMI/DVI device and /Cable Replace Main B/D error cable normal Copyright © 2011 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 82 (Check normal operation of normal? Main B/D External Input, Component, HDMI/ RGB and HDMI/DVI by connecting Jig, pattern Generator ,Set-top Box etc. Copyright © 2011 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...

  • Page 83: Power Error

    Measure voltage of each output of Power B/D Normal? Normal Replace Main B/D voltage? Close Normal Check ST-BY 3.5V voltage? ☞A18 Replace Power B/D Replace Power Copyright © 2011 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 84 Power off by unknown status except listed case "POWEROFF_ABNORMAL1" Power off by abnormal status except CPU trouble Abnormal "POWEROFF_CPUABNORMAL" Power off by CPU Abnormal Copyright © 2011 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...

  • Page 85: Audio Error

    Speaker off Board Cancel OFF Replace Power Board and repair parts Check Disconnection Replace MAIN Board Speaker disconnection Replace Speaker Copyright © 2011 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 86 External Input Connect and check Normal signal error) other external audio? Check and fix device external device Check and fix external device Copyright © 2011 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 87 (Power B/D don’t have problem) Normal Close If R/C operate, operating? Explain the customer cause is interference from light in room. Replace R/C Copyright © 2011 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...

  • Page 88: Function Error

    - S/W Version RGB,HDMI/ Check and fix DVI, Optical Replace Main B/D Fix in external device/cable Recognition error accordance with technical information Copyright © 2011 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 89 “Part related to nose” in the Owner’s then proceed as shown in the solution manual Manual. (For models without any fix information, provide the description) Copyright © 2011 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 90 Replace module Adjust VCOM exterior damage damage ☞A28 Cabinet Replace cabinet damage Remote controller Replace remote controller damage Stand Replace stand dent Copyright © 2011 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 91 Exchange LED driver Board (PSU) A-3/5 Inverter/ Module Exchange Module itself (1) A-4/5 Exchange Module itself (2) A-5/5 Continue to the next page Copyright © 2011 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 92 D. Function error_ No response in Remote controller operation checking remote controller, key error method D. VCOM Adjustment Sequence of the Vcom adjustment Copyright © 2011 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 93 After turning on the power and disassembling the case, check with the naked eye, whether you can see light from module Copyright © 2011 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 94 Check the DC 24V, 12V, 3.5V and Inverter on ALEF LED P202 P203 6~10 6~10 Error Error Inverter ON Inverter ON A-dim A-dim P-dim P-dim Edge LED Copyright © 2011 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 95 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. (Cool/Medium/Warm), re-enter the value after replacing the MAIN BOARD. Copyright © 2011 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 96 Edge LED Inverter On/off Lamp : A-Dim LED : N.C PWM Dim #1 Error-out • Lamp SCANNING Model : PWM Dim #2 Copyright © 2011 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 97 MENU - Set up support - signal test select channel When the signal is strong, use the attenuator (-10dB, -15dB, -20dB etc.) Copyright © 2011 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 98 <ALL MODELS> 1. Checking method for remote controller for adjustment Version Press the IN-START with the remote controller for adjustment Copyright © 2011 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 99 LCD TV connection diagram (1) date **LW95**, **LW77**, **LV55**, **LW65**, **LW57** As the part connecting to the external input, check the screen condition by signal Copyright © 2011 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 100 1. Check the signal strength or check whether the screen is normal when the external device is connected. 2. After measuring each voltage from power supply, finally replace the MAIN BOARD. Copyright © 2011 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 101 Check Link Cable (LVDS) reconnection condition date <ALL MODELS> Check the contact condition of the Link Cable, especially dust or mis insertion. Copyright © 2011 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 102 Check Link Cable reconnection condition date <ALL MODELS> Check the contact condition of the Link Cable, especially dust or mis insertion. Copyright © 2011 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 103 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 © 2011 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 104 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 © 2011 LG Electronics. Inc. All rights reserved. A - 1/5 Only for training and service purposes LGE Internal Use Only...
  • Page 105 Abnormal Power Section Solder defect, Short/Crack Abnormal Display Fuse Open, Abnormal power section Solder defect, Short/Crack Noise GRADATION GRADATION Copyright © 2011 LG Electronics. Inc. All rights reserved. A - 2/5 Only for training and service purposes LGE Internal Use Only...
  • Page 106 Appendix : Exchange PSU(LED driver) No Light Dim Light Dim Light Dim Light No picture/Sound Ok Copyright © 2011 LG Electronics. Inc. All rights reserved. A - 3/5 Only for training and service purposes LGE Internal Use Only...
  • Page 107 Panel Mura, Light leakage Press damage Crosstalk Press damage Crosstalk Un-repairable Cases In this case please exchange the module. Press damage Copyright © 2011 LG Electronics. Inc. All rights reserved. A - 4/5 Only for training and service purposes LGE Internal Use Only...
  • Page 108 Un-repairable Cases In this case please exchange the module. Horizontal Block Gate TAB IC Defect Gate TAB IC Defect Copyright © 2011 LG Electronics. Inc. All rights reserved. A - 5/5 Only for training and service purposes LGE Internal Use Only...
  • Page 109 Check front display LED date Front LED control : Menu Option Power Indicator Standby light ON ST-BY condition: Red Power ON condition: white Copyright © 2011 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 110 Edge LED Inverter On/off Lamp : A-Dim LED : N.C PWM Dim #1 Error-out • Lamp SCANNING Model : PWM Dim #2 Copyright © 2011 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 111 Edge LED Inverter On/off Lamp : A-Dim LED : N.C PWM Dim #1 Error-out • Lamp SCANNING Model : PWM Dim #2 Copyright © 2011 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 112 Entry method 1. Press the IN-START button of the remote controller for adjustment 2. Check the entry into adjustment item 3 Copyright © 2011 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...

  • Page 113: Checking Method

    1. Press the MENU button on the remote controller 2. Select the AUDIO function of the Menu 3. Select TV Speaker from Off to On Copyright © 2011 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 114 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 © 2011 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 115 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. Copyright © 2011 LG Electronics. Inc. All rights reserved. Only for training and service purposes...

  • Page 116: Vcom Adjustment

    ■ Push the OK key to store the value. Then the message “Saving OK” is pop. ■ Press the exit key to finish V-COM adjustment. Copyright © 2011 LG Electronics. Inc. All rights reserved. Only for training and service purposes...

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