D. Function error, Lcd Tv, Check input signal

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http//aic.lgservice.com CHASSIS LD21CSERVICE MANUAL READ THE SAFETY PRECAUTIONS IN THIS MANUAL SPECIFICATION CONTENTSSAFETY PRECAUTIONS SERVICING PRECAUTIONS IMPORTANT SAFETY NOTICE SAFETY PRECAUTIONS Electrostatically Sensitive ES Devices SERVICING PRECAUTIONS Removal IC Remove/ReplacementReplacement Small-Signal Discrete Transistor Removal/Replacement 3. Test method SPECIFICATION4. Model General Specification 1. Application range DVB-S QPSK 2 ~ 45Msymbol/s Symbolrate 4.0Msymbols/s to 7.2Msymbols/ssymbolrate DVB-S2 8PSK / QPSK 2 ~ 45Msymbol/s 5. Video resolutions 2D 5.1. Component Input Y, CB/PB, CR/PR5.2. RGB Input PC - LS35/LS34/CS46 series models are not supported PCDVI 5.3. HDMI InputPC/DTV 2. Designation ADJUSTMENT INSTRUCTIONBoot file Download 1. Application Range 7. ADC Calibration 3.1. ADC Process3.3. EDID data 3.2. EDID Download 4. Total Assembly line process 4.1. Adjustment Preparation3.4 Function Check 6. Model name & Serial number D/L 4.3. Outgoing condition Configuration6.1. Signal Table 5. HI-POT Test GP4LOW 7. MAC Address & CI+ key download6.3. Method & notice 7.1 MAC Address 7.3. LAN PORT INSPECTIONPING TEST 7.2 LAN Inspection IC101 RearSide LG2111 A G301D Applied Model **LM580T, **560T, **LS350T, **CS460TLS350T/CS460T TDSN 560S, **LS350S, **CS460S LS350S/CS460SG001D EXPLODED VIEW +1.5VDDR FROM LIPS & POWER B/DPowerDET +3.3VNormal FOR FHD REVERSE10bit LVDS for large inch51Pin LVDS Connector For FHD 60Hz 30Pin LVDS Connector H5TQ1G63DFR-H9C S7LR2DIVXMS10GP4LS7LR22011/06/03 DDR25612 IC1201 SFLASH1MB Serial Flash for SPI bootGP4LS7LR2 2011/06/03 CI Region Option name of this page CISLOT because of Hong Kong10067972-0500LF H/W option ETHERNET GP4LS7LR22011/06/14 ETHERNET21ETHERNET IR/CONTROLW/OIROUT IR/LED and control for on.y ’12 sub without IR-OUT TDSQ-G001D GP4RGLOBALTUNERBLOCKTU2602TU2603 TDSS-G101D TDSN-G301D TU2601 DCDCGND and AGND are connected DVB-S2 LNB Part AllegroOptionLNB GP4LS7LR22011/11/02 DVBS27 GP4LS7LR22011/11/16 AMPSTA380BWE AUDIO AMPSTA380BWE NAND FLASH MEMORY DDR3 Normal PowerVDDC Normal USB1DIODES USB SIDE HDMI2 HDMI2EANON SIDE HDMIHDMI1 For CEC SCART AUDIO MUTE Full ScartCOMPONENT SCART AUDIO OUT GP4LS7LR22011/09/26 RS-232C 4PIN MSTART DEBUG4PIN 2011/09/05MSTAR DEBUG4PIN Page Contents of LCD TV Standard Repair Process Content Contents of LCD TV Standard Repair Process Detail Technical ManualContinue to the next page Error symptom A2 Check Power Board 24v output A. Video errorLCD TV Main B/D↔ Power B/D, LVDS Cable,Speaker Cable,IR B/D Cable or 24V… voltages of PowerCheck various Board 3.5V,12V,20V 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 Link Cable A8/ A9Check color by input -External Input COMPONENT -RGB ※ Check Check color condition by input -External Input -Component RGB External device screen error-Color errorVertical/Horizontal bar, residual image, light spot Connect other external device and cable Measure voltage of each output of Power B/D B. Power errorCheck Power LED Check Power On ‘”High” POWEROFFCPUABNORMAL Check Power Off ModeIf Power Off mode is not displayed Check Power B/D voltage POWEROFFABNORMAL1 Check audio B+ C. Audio error24V of Power Check user menu Speaker off Check audio B+ Voltage In case of External Input signal error Check and fix external device D. Function error 1. Remote controlR/C operating errorCheck & Repair Replace Main B/D Check input signalY Check technical Signal information input? - Fix information Recognition error Identify nose type E. Noise F. Exterior defect

LG Electronics 340S D. Function error, Lcd Tv, Check input signal, Replace Main B/D, S/W Version

Models: 3450 340S 340T