Manuals / LG Electronics / TV and Video / Flat Panel Television

LG Electronics 340S D. Function error, Lcd Tv, Check input signal, Replace Main B/D, S/W Version

Models: 3450 340S 340T

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Standard Repair Process

	Error	D. Function error	Established	2012. 01 .14
LCD TV	Error	D. Function error	date	2012. 01 .14
LCD TV	symptom	External device recognition error	Revised date		12/14
		External device recognition error	Revised date		12/14

Check input signal

YCheck technical

Signal information

input? - Fix information

Technical	N	External Input and
		Component
information?
		Recognition error

Replace Main B/D

- S/W Version

RGB,HDMI/

Check and fix external device/cable

	Fix in	DVI, Optical
		Recognition error
	accordance

with technical

information

Replace Main B/D

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 340S, 3450 D. Function error, Lcd Tv, Check input signal, Replace Main B/D, S/W Version, External Input and

Contents

http//aic.lgservice.com CHASSIS LD21CSERVICE MANUAL READ THE SAFETY PRECAUTIONS IN THIS MANUALSPECIFICATION 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 rangeDVB-S2 8PSK / QPSK 2 ~ 45Msymbol/s SpecificationSymbolrate 4.0Msymbols/s to 7.2Msymbols/s symbolrate5. Video resolutions 2D 5.1. Component Input Y, CB/PB, CR/PR5.2. RGB Input PC - LS35/LS34/CS46 series models are not supported PCDVI 5.3. HDMI InputPC/DTV2. Designation ADJUSTMENT INSTRUCTIONBoot file Download 1. Application Range7. ADC Calibration 3.1. ADC Process3.3. EDID data 3.2. EDID Download4. Total Assembly line process 4.1. Adjustment Preparation3.4 Function Check 6. Model name & Serial number D/L 4.3. Outgoing condition Configuration6.1. Signal Table 5. HI-POT TestGP4LOW 7. MAC Address & CI+ key download6.3. Method & notice 7.1 MAC Address7.3. LAN PORT INSPECTIONPING TEST 7.2 LAN InspectionIC101 RearSide LG2111 ALG2111 A Applied Model **LM580T, **560T, **LS350T, **CS460TRear SideLG2111 A 560S, **LS350S, **CS460SRear SideEXPLODED VIEW +1.5VDDR FROM LIPS & POWER B/DPowerDET +3.3VNormalOnly for training and service purposes LVDS for large inch51Pin LVDS Connector For FHD 60Hz 30Pin LVDS ConnectorCopyright 2012 LG Electronics. Inc. All rights reserved Only for training and service purposesS7LR2DIVXMS10 GP4LS7LR22011/06/03 DDR256122011/06/03 Serial Flash for SPI bootOnly for training and service purposes GP4LS7LR2Copyright 2012 LG Electronics. Inc. All rights reserved CI RegionOption name of this page CISLOT because of Hong Kong Only for training and service purposesETHERNET H/W option ETHERNETGP4LS7LR22011/06/14 ETHERNET21 Only for training and service purposesLGE Internal Use Only IR/LED and control for on.y ’12 sub without IR-OUTOnly for training and service purposes Copyright 2012 LG Electronics. Inc. All rights reservedTU2601 GP4RGLOBALTUNERBLOCKOnly for training and service purposes TU2602TU2603 TDSS-G101D TDSN-G301DOnly for training and service purposes DVB-S2 LNB Part AllegroOptionLNB GP4LS7LR22011/11/02 DVBS27Copyright 2012 LG Electronics. Inc. All rights reserved AUDIO AMPSTA380BWEOnly for training and service purposes GP4LS7LR22011/11/16 AMPSTA380BWENAND FLASH MEMORY Only for training and service purposesCopyright 2012 LG Electronics. Inc. All rights reserved LGE Internal Use OnlyNormal Normal PowerOnly for training and service purposes VDDCCopyright 2012 LG Electronics. Inc. All rights reserved USB SIDEUSB1DIODES Only for training and service purposesFor CEC HDMI2EANON SIDE HDMIOnly for training and service purposes HDMI1SCART AUDIO OUT Full ScartOnly for training and service purposes COMPONENTLGE Internal Use Only RS-232C 4PINOnly for training and service purposes Copyright 2012 LG Electronics. Inc. All rights reserved2011/09/05 MSTART DEBUG4PINOnly for training and service purposes GP4LS7LR2Page Contents of LCD TV Standard Repair Process Content Contents of LCD TV Standard Repair Process Detail Technical ManualContinue to the next page Error symptomA2 Check Power Board 24v output A. Video errorLCD TV Main B/D↔ Power B/D, LVDS Cable,Speaker Cable,IR B/D CableLCD TV A. Video errorvoltages of Power Only for training and service purposesSignal Quality Normal over 50% A. Video errorBy using Digital signal level meter By using Diagnostics menu on OSD Menu→ Set up→ Support → Signal Test Signal strength Normal over 50%A. Video error LCD TV→ Set-Top-Box, Different maker TV etc Check color by input -External Input COMPONENT -RGB A8/ A9A. Video error LCD TVLCD TV External device screen error-Color errorA. Video error Vertical/Horizontal bar, residual image, light spotMeasure voltage of each output of Power B/D B. Power errorCheck Power LED Check Power On ‘”High”POWEROFFABNORMAL1 B. Power errorCheck Power Off Mode If Power Off mode is not displayed Check Power B/D voltageCheck user menu Speaker off C. Audio error24V of Power LCD TVCheck audio B+ Voltage C. Audio errorIn case of External Input signal error Check and fix external device LCD TVCheck & Repair D. Function error1. Remote controlR/C operating error LCD TVRecognition error D. Function errorCheck input signal Y Check technical Signal information input? - Fix informationE. Noise LCD TVIdentify nose type LCD TV F. Exterior defect

Check input signal

YCheck technical

External Input and

Component

Recognition error

Replace Main B/D

- S/W Version

Check and fix external device/cable

accordance