C. Audio error, Lcd Tv | LG Electronics 3450, 340S, 340T guide

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LG Electronics 3450, 340S, 340T service manual C. Audio error, Lcd Tv, Check audio B+ Voltage

Contents

SERVICE MANUAL CHASSIS LD21CREAD 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 5.1. Component Input Y, CB/PB, CR/PR 5. Video resolutions 2D5.2. RGB Input PC - LS35/LS34/CS46 series models are not supported 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 4.1. Adjustment Preparation 4. Total Assembly line process3.4 Function Check 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 Side RearLG2111 A IC101 LS350T/CS460T Applied Model **LM580T, **560T, **LS350T, **CS460TTDSN G301D LS350S/CS460S 560S, **LS350S, **CS460SG001D EXPLODED VIEW PowerDET FROM LIPS & POWER B/D+3.3VNormal +1.5VDDR 51Pin LVDS Connector For FHD 60Hz LVDS for large inch30Pin LVDS Connector FOR FHD REVERSE10bit GP4LS7LR22011/06/03 DDR25612 S7LR2DIVXMS10IC1201 H5TQ1G63DFR-H9C GP4LS7LR2 Serial Flash for SPI boot2011/06/03 SFLASH1MB Option name of this page CISLOT because of Hong Kong CI Region10067972-0500LF GP4LS7LR22011/06/14 ETHERNET21 H/W option ETHERNETETHERNET IR/CONTROLW/OIROUT IR/LED and control for on.y ’12 sub without IR-OUT TU2602TU2603 TDSS-G101D TDSN-G301D GP4RGLOBALTUNERBLOCKTU2601 TDSQ-G001D OptionLNB DVB-S2 LNB Part AllegroGP4LS7LR22011/11/02 DVBS27 DCDCGND and AGND are connected GP4LS7LR22011/11/16 AMPSTA380BWE AUDIO AMPSTA380BWE NAND FLASH MEMORY VDDC Normal PowerNormal DDR3 USB1DIODES USB SIDE HDMI1 HDMI2EANON SIDE HDMIFor CEC HDMI2 COMPONENT Full ScartSCART AUDIO OUT SCART AUDIO MUTE GP4LS7LR22011/09/26 RS-232C 4PIN 2011/09/05 MSTART DEBUG4PINMSTAR DEBUG4PIN 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… 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 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 1. Remote controlR/C operating error D. Function errorCheck & Repair Y Check technical Signal information input? - Fix information Check input signalRecognition error Replace Main B/D Identify nose type E. Noise F. Exterior defect