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

LG Electronics 340S C. Audio error, Lcd Tv, Check user menu Speaker off, Check audio B+, Normal

Models: 3450 340S 340T

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Standard Repair Process

	Error	C. Audio error	Established	2012. 01 .14
LCD TV	Error	C. Audio error	date	2012. 01 .14
LCD TV	symptom	No audio/ Normal video	Revised date		9/14
		No audio/ Normal video	Revised date		9/14

No audio Screen normal

☞A15

Check user menu > Speaker off

Off

Cancel OFF

☞A16

Check audio B+	Normal	Y
24V of Power	Normal
24V of Power	voltage
Board	voltage
Board

Replace Power Board and repair parts

Check		N
Check		Disconnection
Speaker		Disconnection
Speaker
disconnection
		Y
		Y

		Replace Speaker

Replace MAIN Board

End

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

Page 48

Image 48

LG Electronics 340S C. Audio error, Lcd Tv, Check user menu Speaker off, Check audio B+, Normal, 24V of Power, voltage

Contents

CHASSIS LD21C SERVICE MANUALREAD THE SAFETY PRECAUTIONS IN THIS MANUAL http//aic.lgservice.comCONTENTS SAFETY PRECAUTIONSSERVICING PRECAUTIONS SPECIFICATIONSAFETY PRECAUTIONS IMPORTANT SAFETY NOTICESERVICING PRECAUTIONS Electrostatically Sensitive ES DevicesIC Remove/Replacement ReplacementSmall-Signal Discrete Transistor Removal/Replacement RemovalSPECIFICATION 4. Model General Specification1. Application range 3. Test methodSpecification Symbolrate 4.0Msymbols/s to 7.2Msymbols/ssymbolrate DVB-S2 8PSK / QPSK 2 ~ 45Msymbol/s5. Video resolutions 2D 5.1. Component Input Y, CB/PB, CR/PR5.2. RGB Input PC - LS35/LS34/CS46 series models are not supported 5.3. HDMI InputPC/DTV PCDVIADJUSTMENT INSTRUCTION Boot file Download1. Application Range 2. Designation3.1. ADC Process 3.3. EDID data3.2. EDID Download 7. ADC Calibration4. Total Assembly line process 4.1. Adjustment Preparation3.4 Function Check 4.3. Outgoing condition Configuration 6.1. Signal Table5. HI-POT Test 6. Model name & Serial number D/L7. MAC Address & CI+ key download 6.3. Method & notice7.1 MAC Address GP4LOW7.2 LAN Inspection 7.3. LAN PORT INSPECTIONPING TESTRear SideLG2111 A IC101Applied Model **LM580T, **560T, **LS350T, **CS460T RearSide LG2111 A560S, **LS350S, **CS460S RearSide LG2111 AEXPLODED VIEW FROM LIPS & POWER B/D PowerDET+3.3VNormal +1.5VDDRLVDS for large inch 51Pin LVDS Connector For FHD 60Hz30Pin LVDS Connector Only for training and service purposesOnly for training and service purposes S7LR2DIVXMS10GP4LS7LR22011/06/03 DDR25612 Copyright 2012 LG Electronics. Inc. All rights reservedSerial Flash for SPI boot Only for training and service purposesGP4LS7LR2 2011/06/03CI Region Option name of this page CISLOT because of Hong KongOnly for training and service purposes Copyright 2012 LG Electronics. Inc. All rights reservedH/W option ETHERNET GP4LS7LR22011/06/14 ETHERNET21Only for training and service purposes ETHERNETIR/LED and control for on.y ’12 sub without IR-OUT Only for training and service purposesCopyright 2012 LG Electronics. Inc. All rights reserved LGE Internal Use OnlyGP4RGLOBALTUNERBLOCK Only for training and service purposesTU2602TU2603 TDSS-G101D TDSN-G301D TU2601DVB-S2 LNB Part Allegro OptionLNBGP4LS7LR22011/11/02 DVBS27 Only for training and service purposesAUDIO AMPSTA380BWE Only for training and service purposesGP4LS7LR22011/11/16 AMPSTA380BWE Copyright 2012 LG Electronics. Inc. All rights reservedOnly for training and service purposes Copyright 2012 LG Electronics. Inc. All rights reservedLGE Internal Use Only NAND FLASH MEMORYNormal Power Only for training and service purposesVDDC NormalUSB SIDE USB1DIODESOnly for training and service purposes Copyright 2012 LG Electronics. Inc. All rights reservedHDMI2EANON SIDE HDMI Only for training and service purposesHDMI1 For CECFull Scart Only for training and service purposesCOMPONENT SCART AUDIO OUTRS-232C 4PIN Only for training and service purposesCopyright 2012 LG Electronics. Inc. All rights reserved LGE Internal Use OnlyMSTART DEBUG4PIN Only for training and service purposesGP4LS7LR2 2011/09/05Page Contents of LCD TV Standard Repair Process Contents of LCD TV Standard Repair Process Detail Technical Manual Continue to the next pageError symptom ContentA. Video error LCD TVMain B/D↔ Power B/D, LVDS Cable,Speaker Cable,IR B/D Cable A2 Check Power Board 24v outputA. Video error voltages of PowerOnly for training and service purposes LCD TVA. Video error By using Digital signal level meter By using Diagnostics menu on OSDMenu→ Set up→ Support → Signal Test Signal strength Normal over 50% Signal Quality Normal over 50%A. Video error LCD TV→ Set-Top-Box, Different maker TV etc A8/ A9 A. Video errorLCD TV Check color by input -External Input COMPONENT -RGBExternal device screen error-Color error A. Video errorVertical/Horizontal bar, residual image, light spot LCD TVB. Power error Check Power LEDCheck Power On ‘”High” Measure voltage of each output of Power B/DB. Power error Check Power Off ModeIf Power Off mode is not displayed Check Power B/D voltage POWEROFFABNORMAL1C. Audio error 24V of PowerLCD TV Check user menu Speaker offC. Audio error In case of External Input signal error Check and fix external deviceLCD TV Check audio B+ VoltageD. Function error 1. Remote controlR/C operating errorLCD TV Check & RepairD. Function error Check input signalY Check technical Signal information input? - Fix information Recognition errorE. Noise LCD TVIdentify nose type F. Exterior defect LCD TV