LG Electronics 26CS460T B. Power error, Lcd Tv, Stand-By Red, Check Power LED, Check ST-BY

Page 46
B. Power error

Standard Repair Process

 

 

Error

B. Power error

Established

2012. 01 .14

 

 

LCD TV

date

 

 

symptom

No power

Revised date

 

7/14

 

 

 

 

 

 

 

 

 

 

 

☞A11

☞A13

Check

Power LED

. Stand-By: Red

Power LED Y

On?

N Check

Check Power cord was inserted properly

DC Power on

by pressing Power Key On Remote control

Normal N operation?

Y

☞A4

Check Power On ‘”High”

Y Replace

OK? . Stand-By: Red Power

B/D

Replace Main B/D

N

Normal?

Y

Measure voltage of each output of Power B/D

※

Close

Check ST-BY 3.5V

☞A12

Y

Normal

voltage?

N

Replace Power B/D

Normal Y voltage?

N

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

 

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Contents READ THE SAFETY PRECAUTIONS IN THIS MANUAL CHASSIS LD21CSERVICE 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 - LS35/LS34/CS46 series models are not supported 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 4.3. 3D function test 4.5. Outgoing condition Configuration4.2. EYE-Q function check 4.4. IR emitter inspection6. Model name & Serial number D/L 6.1. Signal Table5. HI-POT Test 5.1. HI-POT auto-check preparation7.2 LAN Inspection 7. MAC Address & CI+ key download7.1 MAC Address 7.3. LAN PORT INSPECTIONPING TESTLG2111 A RearSide IC101TDSN Applied Model **LM580T, **560T, **LS350T, **CS460TLS350T/CS460T G301DLS350S/CS460S 560S, **LS350S, **CS460SG001D EXPLODED VIEW +3.3VNormal FROM LIPS & POWER B/DPowerDET +1.5VDDR30Pin LVDS Connector LVDS for large inch51Pin LVDS Connector For FHD 60Hz FOR FHD REVERSE10bitIC1201 S7LR2DIVXMS10GP4LS7LR22011/06/03 DDR25612 H5TQ1G63DFR-H9C2011/06/03 Serial Flash for SPI bootGP4LS7LR2 SFLASH1MBOption name of this page CISLOT because of Hong Kong CI Region10067972-0500LF GP4LS7LR22011/06/14 ETHERNET21 H/W option ETHERNETETHERNET IR/LED and control for on.y ’12 sub without IR-OUT IR/CONTROLW/OIROUTTU2601 GP4RGLOBALTUNERBLOCKTU2602TU2603 TDSS-G101D TDSN-G301D TDSQ-G001DGP4LS7LR22011/11/02 DVBS27 DVB-S2 LNB Part AllegroOptionLNB DCDCGND and AGND are connectedAUDIO AMPSTA380BWE GP4LS7LR22011/11/16 AMPSTA380BWENAND FLASH MEMORY Normal Normal PowerVDDC DDR3USB SIDE USB1DIODESFor CEC HDMI2EANON SIDE HDMIHDMI1 HDMI2SCART AUDIO OUT Full ScartCOMPONENT SCART AUDIO MUTERS-232C 4PIN GP4LS7LR22011/09/262011/09/05 MSTART DEBUG4PINMSTAR DEBUG4PIN 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
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