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LG Electronics 42LT640H-ZA service manual F. Exterior defect, Lcd Tv

Models: 42LT640H-ZA

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Standard Repair Process
	Error	F. Exterior defect		Established
LCD TV	Error	F. Exterior defect		date
LCD TV	symptom		Exterior defect	Revised date	13/13
			Exterior defect	Revised date	13/13
	Zoom part with	Module	Replace module
	exterior damage	damage	Replace module
	exterior damage	damage
		Cabinet	Replace cabinet
		damage	Replace cabinet
		damage
		Remote
		controller	Replace remote controller
		damage
		Stand	Replace stand
		dent	Replace stand
		dent
			13

Copyright © 2012 LG Electronics. Inc. All rights reserved.	LGE Internal Use Only
Only for training and service purposes

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Image 51

LG Electronics 42LT640H-ZA service manual F. Exterior defect, Lcd Tv

Contents

http//biz.lgservice.com READ THE SAFETY PRECAUTIONS IN THIS MANUALhttp//aic.lgservice.com http//eic.lgservice.comSPECIFICATION CONTENTSSAFETY PRECAUTIONS SERVICING PRECAUTIONSIMPORTANT SAFETY NOTICE SAFETY PRECAUTIONSElectrostatically Sensitive ES Devices SERVICING PRECAUTIONSRemoval IC Remove/ReplacementReplacement Small-Signal Discrete Transistor Removal/Replacement3. Test method SPECIFICATION4. Model General Specification 1. Application rangeRGB Input SpecificationOnly for training and service purposes Remarks5. Video resolutions 2D 5.1. Component Input Y, CB/PB, CR/PR5.2. RGB Input PC PCDVI 5.3. HDMI InputPC/DTV1. Application Range ADJUSTMENT INSTRUCTIONBoot file Download After downloading, have to adjust Tool Option again3.2. Function Check 4. Total Assembly line process4.1. Adjustment Preparation 3.1. ADC ProcessManual W/B process using adjust Remote control 4.4. EDID data4.2. DDC EDID Write RGB 128Byte 4.3 DDC EDID Write HDMI 256Byte4.6.2. HI-POT auto-check 4.5. Outgoing condition Configuration4.6. HI-POT Test 4.6.1. HI-POT auto-check preparation5.3. Method & notice 5.1. Signal Table5. Model name & Serial number D/L 5.2. Comand Set6.1. Download Procedure 6. CI+ Key Download methodCI+ Key Value All rights reserved BLOCK DIAGRAMS7LR CopyrightEXPLODED VIEW 2011 . 08 Only for training and service purposesEMEA INTERACTIVE GP4MSTAROLED Step Up regulator 3 . 3V to 5VMAX 250mA Only for training and service purposesCopyright 2012 LG Electronics. Inc. All rights reserved LGE Internal Use Only+3.3VNormal FROM LIPS & POWER B/DPowerDET +1.5VDDRNTP-7500L IC501LGE Internal Use Only CONTROL IR & LEDOnly for training and service purposes Copyright 2012 LG Electronics. Inc. All rights reservedCopyright 2012 LG Electronics. Inc. All rights reserved Only for training and service purposes51Pin LVDS Connector 30Pin LVDS Connector For HD 60HzNormalHDMI2 Only for training and service purposesHDMI1 For CEC0 . 3 3 u F Only for training and service purposesCopyright 2012 LG Electronics. Inc. All rights reserved LGE Internal Use OnlyCopyright 2012 LG Electronics. Inc. All rights reserved RGB/SPDIF/PC/HP/USBUSBDIODES Only for training and service purposesCopyright 2012 LG Electronics. Inc. All rights reserved Only for training and service purposesS7LRDIVXMS10 EMEA INTERACTIVEIC1300 Only for training and service purposesCopyright 2012 LG Electronics. Inc. All rights reserved LGE Internal Use OnlySI2156DVB1INPUTH Only for training and service purposesP4RGLOBALTUNERBLOCK SI2176ATSC1INPUTHPILG1001 A2 IC1501LGDT1001 Only for training and service purposesLGE Internal Use Only Full Scart/ Comp1Only for training and service purposes Copyright 2012 LG Electronics. Inc. All rights reservedEXTSPK OUT UART/I2C SWITCHEXTSPK AMP EXTSPKCONTROL/DEBUGLGE Internal Use Only EXTERNALPOWER OUT 5V/12VOnly for training and service purposes Copyright 2012 LG Electronics. Inc. All rights reservedCopyright 2012 LG Electronics. Inc. All rights reserved CI RegionOption name of this page CI SLOT because of Hong Kong Only for training and service purposesLGE Internal Use Only SMD GASKETOnly for training and service purposes Copyright 2012 LG Electronics. Inc. All rights reservedPage 1. Trouble Shooting Contents of LCD TV Standard Repair ProcessA2 Check Power Board 24V,12V,3.5V output A. Video errorMain B/D↔ Power B/D, LVDS Cable,Speaker Cable,IR B/D Cable LCD TVLCD TV A. Video errorvoltages of Power Only for training and service purposesSignal strength Normal over 30% Signal Quality Normal over 30% A. Picture ProblemBy using Digital signal level meter By using Diagnostics menu on OSD Menu→Setup→Manual Tuning※ Check A. Video errorLCD TV Check color by input -External Input COMPONENT -RGBVertical/Horizontal bar, residual image, light spot Connect other external device and cableExternal device screen error-Color error A. Video errorCheck Power On ‘”High” B. Power errorStand-By Red Operating white Check Power LEDPOWEROFFABNORMAL1 B. Power errorCheck Power Off Starusinstart menu If Power Off mode is not displayed Check Power B/D voltageCheck user menu Speaker off C. Audio errorPower Board LCD TVCheck audio B+ Voltage 20V or C. Audio errorIn case of External Input signal error Check and fix external device LCD TVOutput signal D. General Function Problem1. Remote controlR/C operating error Check & Repair Cable connection Connector solderS/W Version D. Function errorCheck input signal Y Check technical Signal information input? - Fix informationE. Noise Identify nose typeLCD TV LCD TV F. Exterior defectStandard Repair Process Detail Technical Manual A. Video errorVideo error, video lag/stopMENU -Æ red keycustomer support -Æ signal test -Æ select channel When the signal is strong, use the attenuator -10dB, -15dB, -20dB etcVersion 1. Checking method for remote controller for adjustmentPress the IN-START with the remote controller for adjustment ALL MODELSStandard Repair Process Detail Technical Manual A. Video errorColor errorYou can view 6 types of patterns using the ADJ Key Only for training and service purposesAppendix Exchange T-Con Board Appendix Exchange T-Con Board No picture/Sound Ok A - 3/5 Appendix Exchange PSULED driverNo Light Dim LightPress damage Appendix Exchange the ModuleUn-repairable Cases In this case please exchange the module Panel Mura, Light leakageUn-repairable Cases In this case please exchange the module Appendix Exchange the ModuleEntry method 1. Press the IN-START button of the remote controller for adjustment2. Check the entry into adjustment item B. Power error Off when on, off whiling viewing2. Select the AUDIO function of the Menu C. Audio errorNo audio/Normal video1. Press the MENU button on the remote controller Checking method