LG Electronics 32LS679C-ZC B. Power error, Lcd Tv, Stand-By Red, Check Power LED, Check ST-BY

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Standard Repair Process

	Error	B. Power error	Established	2012. 01 .14
LCD TV	Error	B. Power error	date	2012. 01 .14
LCD TV	symptom	No power	Revised date		7/14
		No power	Revised date		7/14

☞A11

☞A13

Check

Power LED

. Stand-By: Red

Power LED Y

On?

Check Power cord was inserted properly

DC Power on

by pressing Power Key On Remote control

Normal N operation?

☞A4

Check Power On ‘”High”

Y Replace

OK? Power

B/D

Replace Main B/D

Normal?

Measure voltage of each output of Power B/D

※

Check ST-BY 3.5V

☞A12

Normal

voltage?

Replace Power B/D

Normal Y voltage?

Replace Power B/D

Replace Main B/D

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

Image 46

Contents READ THE SAFETY PRECAUTIONS IN THIS MANUAL CHASSIS LD21BSERVICE MANUAL http//aic.lgservice.comSERVICING PRECAUTIONS CONTENTSSAFETY PRECAUTIONS SPECIFICATIONSAFETY PRECAUTIONS IMPORTANT SAFETY NOTICESERVICING PRECAUTIONS Electrostatically Sensitive ES DevicesSmall-Signal Discrete Transistor Removal/Replacement IC Remove/ReplacementReplacement Removal1. Application range SPECIFICATION4. Model General Specification 3. Test methodDVB-S2 8PSK / QPSK 2 ~ 45Msymbol/s Symbolrate 4.0Msymbols/s to 7.2Msymbols/ssymbolrate DVB-S QPSK 2 ~ 45Msymbol/s5.1. Component Input Y, CB/PB, CR/PR 5. Video resolutions 2D5.2. RGB Input PC 5.3. HDMI InputPC/DTV PCDVI1. Application Range ADJUSTMENT INSTRUCTIONBoot file Download 2. Designation3.2. EDID Download 3.1. ADC Process3.3. EDID data 7. ADC Calibration4.1. Adjustment Preparation 4. Total Assembly line process3.4 Function Check 5. HI-POT Test 4.3. Outgoing condition Configuration6.1. Signal Table 6. Model name & Serial number D/L7.1 MAC Address 7. MAC Address & CI+ key download6.3. Method & notice GP4LOW7.2 LAN Inspection 7.3. LAN PORT INSPECTIONPING TESTח ͷͲͳͤͤͤͪͥͣ͢͡ ͙;ͤ͛ͽͥͦ͑͟͝ͳͼ͑͝;ΒΔΙΚΟΖ͚ ח ͣ͢ͶͲ SCREW ASSEMBLY WORKING GUIDEScrew specification and application situation ח ͷͲͳͤͨͩͩͣ͑͢͡͡ ͙;ͧ͛ͽ͑͢͡͝ͳͼ͑͝;ΒΔΙΚΟΖ͚Side BLOCK DIAGRAMRear LG2111 AEXPLODED VIEW to delete CI or gate for GP4LS7LR22011.12.01Copyright 2012 LG Electronics. Inc. All rights reserved for SYSTEM EEPROMNormal Normal PowerVDDC DDR3+3.3VNormal FROM LIPS & POWER B/DPowerDET +1.5VDDRIR/LED and control for normal models USB1DIODES USB SIDEUSB2DIODES HDMI SPECIAL FEATURES IMPORTANT FOR PROTECTION FROM X-RADIATION RGB-PC / SPDIFTHE SYMBOL MARK OF THIS SCHEMETIC DIAGRAM INCORPORATES FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF ISCOMMERCIAL/NonOS MODEL OPTION COMMERCIAL MODEL OPTION RS-232CFor Comsumer model, use 4PIN Wafer LVDS for large inch IC1201 S7LR2DIVXMS10GP4LS7LR22011/06/03 DDR25612 H5TQ1G63DFR-H9CSFLASHMAINMACRONIX Serial Flash for SPI bootSFLASHMAINWINBOND IC1401-*1 W25Q80BVSSIG PHONE Headphone *Option HEADPHONEHEAD Option name of this page CISLOT because of Hong Kong CI Region10067972-0500LF GP4LS7LR22011/06/14 ETHERNET21 H/W option ETHERNETETHERNET TU2601 GP4RGLOBALTUNERBLOCKTU2602TU2603 TDSS-G101D TDSN-G301D TDSQ-G001DGP4LS7LR22011/11/02 DVBS27 DVB-S2 LNB Part AllegroOptionLNB DCDCGND and AGND are connectedJK2801 SCART / COMPONENT&COMPSITFULL SCART / COMPONENT1 PSC008-01AUDIO AMPSTA380BWE Page Contents of LCD TV Standard Repair Process Error symptom Contents of LCD TV Standard Repair Process Detail Technical ManualContinue to the next page ContentMain B/D↔ Power B/D, LVDS Cable,Speaker Cable,IR B/D Cable A. Video errorLCD TV A2 Check Power Board 24v outputBoard 3.5V,12V,20V voltages of PowerCheck various or 24V…Menu→ Set up→ Support → Signal Test Signal strength Normal over 50% By using Digital signal level meter By using Diagnostics menu on OSDSignal Quality Normal over 50% → Set-Top-Box, Different maker TV etc ※ Check A8/ A9Check color by input -External Input COMPONENT -RGB Link CableConnect other external device and cable External device screen error-Color errorVertical/Horizontal bar, residual image, light spot Check color condition by input -External Input -Component RGBCheck Power On ‘”High” B. Power errorCheck Power LED Measure voltage of each output of Power B/DPOWEROFFABNORMAL1 Check Power Off ModeIf Power Off mode is not displayed Check Power B/D voltage POWEROFFCPUABNORMALCheck user menu Speaker off C. Audio error24V of Power Check audio B+In case of External Input signal error Check and fix external device Check audio B+ Voltage1. Remote controlR/C operating error D. Function errorCheck & Repair Recognition error Check input signalY Check technical Signal information input? - Fix information Replace Main B/DE. Noise Identify nose typeF. Exterior defect