A. Video error, Lcd Tv, Check various | LG Electronics 32LS679C-ZC

Standard Repair Process

	Error	A. Video error	Established	2012 . 01
LCD TV	Error	A. Video error	date	2012 . 01
LCD TV	symptom	No video/ No audio	Revised date	.14	2/14
		No video/ No audio	Revised date		2/14

No Video/ No audio

☞A4

Check various		Normal Y
voltages of Power		Normal Y
Board ( 3.5V,12V,20V		voltage?
or 24V…)
		N

		Replace Power
		Board and repair
		parts

Check and replace

MAIN B/D

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 A. Video error, Lcd Tv, Check various, voltages of Power, Board 3.5V,12V,20V, or 24V…

Contents

SERVICE MANUAL CHASSIS LD21BREAD THE SAFETY PRECAUTIONS IN THIS MANUAL http//aic.lgservice.com SAFETY PRECAUTIONS CONTENTSSERVICING PRECAUTIONS SPECIFICATION IMPORTANT SAFETY NOTICE SAFETY PRECAUTIONS Electrostatically Sensitive ES Devices SERVICING PRECAUTIONS Replacement IC Remove/ReplacementSmall-Signal Discrete Transistor Removal/Replacement Removal 4. Model General Specification SPECIFICATION1. Application range 3. Test method symbolrate Symbolrate 4.0Msymbols/s to 7.2Msymbols/sDVB-S2 8PSK / QPSK 2 ~ 45Msymbol/s DVB-S QPSK 2 ~ 45Msymbol/s 5.2. RGB Input PC 5. Video resolutions 2D5.1. Component Input Y, CB/PB, CR/PR PCDVI 5.3. HDMI InputPC/DTV Boot file Download ADJUSTMENT INSTRUCTION1. Application Range 2. Designation 3.3. EDID data 3.1. ADC Process3.2. EDID Download 7. ADC Calibration 3.4 Function Check 4. Total Assembly line process4.1. Adjustment Preparation 6.1. Signal Table 4.3. Outgoing condition Configuration5. HI-POT Test 6. Model name & Serial number D/L 6.3. Method & notice 7. MAC Address & CI+ key download7.1 MAC Address GP4LOW 7.3. LAN PORT INSPECTIONPING TEST 7.2 LAN Inspection Screw specification and application situation SCREW ASSEMBLY WORKING GUIDEח ͷͲͳͤͤͤͪͥͣ͢͡ ͙;ͤ͛ͽͥͦ͑͟͝ͳͼ͑͝;ΒΔΙΚΟΖ͚ ח ͣ͢ͶͲ ח ͷͲͳͤͨͩͩͣ͑͢͡͡ ͙;ͧ͛ͽ͑͢͡͝ͳͼ͑͝;ΒΔΙΚΟΖ͚ Rear BLOCK DIAGRAMSide LG2111 A EXPLODED VIEW Copyright 2012 LG Electronics. Inc. All rights reserved GP4LS7LR22011.12.01to delete CI or gate for for SYSTEM EEPROM VDDC Normal PowerNormal DDR3 PowerDET FROM LIPS & POWER B/D+3.3VNormal +1.5VDDR IR/LED and control for normal models USB2DIODES USB SIDEUSB1DIODES HDMI THE SYMBOL MARK OF THIS SCHEMETIC DIAGRAM INCORPORATES RGB-PC / SPDIFSPECIAL FEATURES IMPORTANT FOR PROTECTION FROM X-RADIATION FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS For Comsumer model, use 4PIN Wafer RS-232CCOMMERCIAL/NonOS MODEL OPTION COMMERCIAL MODEL OPTION LVDS for large inch GP4LS7LR22011/06/03 DDR25612 S7LR2DIVXMS10IC1201 H5TQ1G63DFR-H9C SFLASHMAINWINBOND IC1401-*1 W25Q80BVSSIG Serial Flash for SPI bootSFLASHMAINMACRONIX HEAD Headphone *Option HEADPHONEPHONE 10067972-0500LF CI RegionOption name of this page CISLOT because of Hong Kong ETHERNET H/W option ETHERNETGP4LS7LR22011/06/14 ETHERNET21 TU2602TU2603 TDSS-G101D TDSN-G301D GP4RGLOBALTUNERBLOCKTU2601 TDSQ-G001D OptionLNB DVB-S2 LNB Part AllegroGP4LS7LR22011/11/02 DVBS27 DCDCGND and AGND are connected FULL SCART / COMPONENT1 SCART / COMPONENT&COMPSITJK2801 PSC008-01 AUDIO AMPSTA380BWE Page Contents of LCD TV Standard Repair Process Continue to the next page Contents of LCD TV Standard Repair Process Detail Technical ManualError symptom Content LCD TV A. Video errorMain B/D↔ Power B/D, LVDS Cable,Speaker Cable,IR B/D Cable A2 Check Power Board 24v output Check various voltages of PowerBoard 3.5V,12V,20V or 24V… Signal Quality Normal over 50% By using Digital signal level meter By using Diagnostics menu on OSDMenu→ Set up→ Support → Signal Test Signal strength Normal over 50% → Set-Top-Box, Different maker TV etc Check color by input -External Input COMPONENT -RGB A8/ A9※ Check Link Cable Vertical/Horizontal bar, residual image, light spot External device screen error-Color errorConnect other external device and cable Check color condition by input -External Input -Component RGB Check Power LED B. Power errorCheck Power On ‘”High” Measure voltage of each output of Power B/D If Power Off mode is not displayed Check Power B/D voltage Check Power Off ModePOWEROFFABNORMAL1 POWEROFFCPUABNORMAL 24V of Power C. Audio errorCheck user menu Speaker off Check audio B+ Check audio B+ Voltage In case of External Input signal error Check and fix external device Check & Repair D. Function error1. Remote controlR/C operating error Y Check technical Signal information input? - Fix information Check input signalRecognition error Replace Main B/D Identify nose type E. Noise F. Exterior defect

LG Electronics 32LS679C-ZC A. Video error, Lcd Tv, Check various, voltages of Power, or 24V…

Models: 32LS679C-ZC

Check various

voltages of Power

Board ( 3.5V,12V,20V

or 24V…)