C. Audio error, Lcd Tv, Check audio B+ | LG Electronics 32LS679C-ZC

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

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LG Electronics 32LS679C-ZC C. Audio error, Lcd Tv, Check user menu Speaker off, Check audio B+, Normal, 24V of Power

Contents

CHASSIS LD21B SERVICE MANUALREAD THE SAFETY PRECAUTIONS IN THIS MANUAL http//aic.lgservice.com CONTENTS SAFETY PRECAUTIONSSERVICING PRECAUTIONS SPECIFICATION SAFETY PRECAUTIONS IMPORTANT SAFETY NOTICE SERVICING PRECAUTIONS Electrostatically Sensitive ES Devices IC Remove/Replacement ReplacementSmall-Signal Discrete Transistor Removal/Replacement Removal SPECIFICATION 4. Model General Specification1. Application range 3. Test method Symbolrate 4.0Msymbols/s to 7.2Msymbols/s symbolrateDVB-S2 8PSK / QPSK 2 ~ 45Msymbol/s DVB-S QPSK 2 ~ 45Msymbol/s 5. Video resolutions 2D 5.1. Component Input Y, CB/PB, CR/PR5.2. RGB Input PC 5.3. HDMI InputPC/DTV PCDVI ADJUSTMENT INSTRUCTION Boot file Download1. Application Range 2. Designation 3.1. ADC Process 3.3. EDID data3.2. EDID Download 7. ADC Calibration 4. 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/L 7. MAC Address & CI+ key download 6.3. Method & notice7.1 MAC Address GP4LOW 7.2 LAN Inspection 7.3. LAN PORT INSPECTIONPING TEST SCREW ASSEMBLY WORKING GUIDE Screw specification and application situationח ͷͲͳͤͤͤͪͥͣ͢͡ ͙;ͤ͛ͽͥͦ͑͟͝ͳͼ͑͝;ΒΔΙΚΟΖ͚ ח ͣ͢ͶͲ ח ͷͲͳͤͨͩͩͣ͑͢͡͡ ͙;ͧ͛ͽ͑͢͡͝ͳͼ͑͝;ΒΔΙΚΟΖ͚ BLOCK DIAGRAM RearSide LG2111 A EXPLODED VIEW GP4LS7LR22011.12.01 Copyright 2012 LG Electronics. Inc. All rights reservedto delete CI or gate for for SYSTEM EEPROM Normal Power VDDCNormal DDR3 FROM LIPS & POWER B/D PowerDET+3.3VNormal +1.5VDDR IR/LED and control for normal models USB SIDE USB1DIODESUSB2DIODES HDMI RGB-PC / SPDIF THE SYMBOL MARK OF THIS SCHEMETIC DIAGRAM INCORPORATESSPECIAL FEATURES IMPORTANT FOR PROTECTION FROM X-RADIATION FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS RS-232C COMMERCIAL/NonOS MODEL OPTION COMMERCIAL MODEL OPTIONFor Comsumer model, use 4PIN Wafer LVDS for large inch S7LR2DIVXMS10 GP4LS7LR22011/06/03 DDR25612IC1201 H5TQ1G63DFR-H9C Serial Flash for SPI boot SFLASHMAINMACRONIXSFLASHMAINWINBOND IC1401-*1 W25Q80BVSSIG Headphone *Option HEADPHONE PHONEHEAD CI Region Option name of this page CISLOT because of Hong Kong10067972-0500LF H/W option ETHERNET GP4LS7LR22011/06/14 ETHERNET21ETHERNET GP4RGLOBALTUNERBLOCK TU2602TU2603 TDSS-G101D TDSN-G301DTU2601 TDSQ-G001D DVB-S2 LNB Part Allegro OptionLNBGP4LS7LR22011/11/02 DVBS27 DCDCGND and AGND are connected SCART / COMPONENT&COMPSIT FULL SCART / COMPONENT1JK2801 PSC008-01 AUDIO AMPSTA380BWE Page Contents of LCD TV Standard Repair Process Contents of LCD TV Standard Repair Process Detail Technical Manual Continue to the next pageError symptom Content A. Video error LCD TVMain B/D↔ Power B/D, LVDS Cable,Speaker Cable,IR B/D Cable A2 Check Power Board 24v output voltages of Power Check variousBoard 3.5V,12V,20V or 24V… By using Digital signal level meter By using Diagnostics menu on OSD Menu→ Set up→ Support → Signal Test Signal strength Normal over 50%Signal Quality Normal over 50% → Set-Top-Box, Different maker TV etc A8/ A9 Check color by input -External Input COMPONENT -RGB※ Check Link Cable External device screen error-Color error Vertical/Horizontal bar, residual image, light spotConnect other external device and cable Check color condition by input -External Input -Component RGB B. Power error Check Power LEDCheck Power On ‘”High” Measure voltage of each output of Power B/D Check Power Off Mode If Power Off mode is not displayed Check Power B/D voltagePOWEROFFABNORMAL1 POWEROFFCPUABNORMAL C. Audio error 24V of PowerCheck user menu Speaker off Check audio B+ In case of External Input signal error Check and fix external device Check audio B+ Voltage D. Function error 1. Remote controlR/C operating errorCheck & Repair Check input signal Y Check technical Signal information input? - Fix informationRecognition error Replace Main B/D E. Noise Identify nose type F. Exterior defect