All Models, Date, LGE Internal Use Only

Standard Repair Process Detail Technical Manual

LCD TV

Error	C. Audio error_No audio/Normal video	Established	2010. 12 .14
symptom
		date
Content	Checking method in menu when there is no audio	Revised		A24
		date

Checking method

1.Press the MENU button on the remote controller

2.Select the AUDIO function of the Menu

3.Select TV Speaker from Off to On

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

Page 115

Image 115

LG Electronics 640T-ZA Standard Repair Process Detail Technical Manual, All Models, date, LGE Internal Use Only

Contents

LED LCD TV MODEL 32LM640S/640T32LM640S/640T-ZA SERVICE MANUAL LG Electronics. Inc. All rights reserved CONTENTSOnly for training and service purposes Copyright Leakage Current Cold CheckAntenna Cold Check SAFETY PRECAUTIONSIMPORTANT SAFETY NOTICE Before returning the receiver to the customer Electrostatically Sensitive ES Devices SERVICING PRECAUTIONS Removal IC Remove/ReplacementReplacement Small-Signal Discrete Transistor Removal/Replacement 2. Requirement for Test SPECIFICATION4. Model General Specification 1. Application range DVB-S2 8PSK / QPSK 2 ~ 45Msymbol/s Symbolrate4.0Msymbols/s to 7.2Msymbols/s symbolrate 6. RGB input PC 5. Component Video Input Y, Cb/Pb, Cr/Pr 7.2. PC mode 7. HDMI Input 7.1. DTV mode 2. Designation ADJUSTMENT INSTRUCTION3. Automatic Adjustment 1. Application Range 3.3. LAN 3.2. MAC address D/L, CI+ key D/L, Widevine key D/L, ESN D/L3.4. LAN PORT INSPECTIONPING TEST SET PC 3.5.1. Model name & Serial number D/L 3.7. WIFI MAC ADDRESS CHECK3.5. Model name & Serial number Download 3.6. CI+ Key checking method 4.1.3. Download method 4. Manual Adjustment4.1.1. Overview 4.1.2. Equipment 4.2.2. Equipment 4.2. White Balance Adjustment4.2.4. Adj. Command Protocol 4.2.1. Overview 4.2.7. LED White balance table 4.5. Magic Motion Remote control test4.3. EYE-Q function check 4.4. Local Dimming Function Check 4.9. Option selection per country 4.7. Wi-Fi Test4.6. 3D function test 4.8. LNB voltage and 22KHz tone check 5. Audio 6. USB S/W DownloadService only4.12. GND and Internal Pressure check HDMI BLOCK DIAGRAMSide Rear IMPORTANT SAFETY NOTICE EXPLODED VIEW JTAG 10K EAX6430790* LD22* / LC22 EAX6443420* LT22* / LJ22* / LA22* / LB22NVRAM X-TAL Place at JACK SIDE PLACE AT JACK SIDEPLACE AT JACK SIDE 12.5TGASKITSMDUSB1 SMD Gaskit12.5TGASKITSMDUSB3 PLACE AT MAIN SOC SIDE PLACE AT JACK SIDEPLACE AT IC6000 IC105 LGE2112 IC701 H5TQ2G63BFR-PBCIC703 H5TQ2G63BFR-PBC Copyright 2012 LG Electronics. Inc. All rights reserved On-semi FROM LIPS & POWER B/DPowerDET PANELPOWER Eye Sensor Option Renesas MICOMFor Debug MICOM MODEL OPTION UI HDMI2 HDMI1UI HDMI3 HDMI4 JK3603 SLIM-15F-D-2 RGB/ PC AUDIO/ SPDIFSPDIF OUT PC AUDIO JACKCOMMON ESD for MTK CVBS 1 PHONE JACK RS232CCOMPONENT 1 PHONE JACK RGB Sensor IR & KEYZener Diode is close to wafer USB2 MAX 1.5A USBWIFI+5VUSB FOR USB1 USB1 SCART GENDER Full Scart18 Pin Gender2011.10.26 1/16W ZigBeeRadio Pulse MREMOTE OPTIONALL MREMOTE OPTION AR4800 Ethernet Block 2011.11.21 IC5800STA380BW GP4MT5369 A Z4580MTR-E1 SCART AUDIO MUTEAUDOUT EU/CHINAHOTELOPT IC6000 HEADPHONE AMP EARPHONE AMP Option FOR LG1152 Option FOR MTK TU6501 T/C/S & H/NIM & T2/C TUNEREU & CHINAVout=0.6*1+R1/R2 TU6500 DCDCGND and AGND are connected in pin#27 OptionLNBDVB-S2 LNB Part Allegro DCDCGND and AGND are connected COMMERCIALOPTION AUDIO OUT JACK OPTCOMMEREXTAMP COMMEREXTAMPJACKFOR COMMERCIAL 12V OUT RS-232C 9 PIN OPTCOMMEREXT12V FOR COMMERCIAL AUDIO OUT OPTCOMMEREXTAMP 2011.08.11 LVDS51Pin LVDS OUTPUT Connector 41Pin LVDS OUTPUT Connector LVDSHIGHMID AR7600 LOCAL DIMMINGL/DIMOUT T-Con POWER BLOCKTHIS IS REVERSE PATTERN LEVEL SHIFTER BLOCK Just Interal LDO Capacitor Don’t Connect Power At VDDIeMMC I/F HYNIXEMMC2GB LOGOLIGHT R8901 10K Place Near MicomPage 2012 LED/LCD TV Engineering guide Applicable Model XXLM760S-ZB Adjust way of new features widevine… Repair guide CONTENTNew features Main PCBs Block Diagrams, IIC Map Instruction of new sub ass’ys How to use tool Download EPI Interface EPIEmbedded Point-Point Interface FeaturesMerits What to change EPI Interface mini-LVDS vs. EPIHF mini-LVDS TCON Comparison HF mini-LVDS Chassis LD22E PCB P/No EAX64307905 Main PCB for BroadbandWIFI xxLM760S-ZB Rear MTK5369 Block Diagram LM76Power load Side IC6100 Jack InterfaceMain SoC MTK Full Scart18 Pin Gender R 47옴 GP4 Backend block diagram EPI & T-conR0 옴 50Pin GP4 Backend block diagram EPI & T-ConEPI CH1/2/3 EPI CH4/5/6 LVDSSEL “H”=JEIDA, “L” or NC=VESA LGD GP4 Backend block diagram LVDS Tx & Local DimmingLVDS Tx Block Dual-link LVDS Output xxLM760S-ZA InterconnectionPCBs Cables KEY1, KEY2 Voltage Circuit Block DiagramAss’y Picture Pin Configuration 2012Y IR + Soft touch PCB Pinmap 2012Y IR + Soft Touch LED Lighting Scenario Power LED ScenarioSpec 내용 Manual of Touch Sensitivity Introductions of GP4 Sensor Touch ICTouch Key Threshold Level Ta = 25ºC Addr Value Touch EEPROM Register change with USB port Introductions of 12Y RF ass’y + Magic Remote control ™ Motion Data Transmission 1. System™ Pairing Information Transmission Send to TV after Paired Pairing Information Transmission Sequence ← ok → powermute home Connector 3. M4 Block DiagramAA x 2 Battery Power Management Function 4. Function list주요 Item Manufacturer Method 5. RF Pairing / Un-pairing MethodDescription Introductions of 12Y WIFI built in ass’y WIFI built in feature WIFI Built in ass’y featureLGITBlock diagram Pin map WIFI Built in Block-diagramArcadyan WIFI Built in ass’y Specification 1. Widevine? 2. HDCP 2.0 & NETFLIX? 3. DTCP? 4. Changed BOM 12Y Widevine & HDCP 2.0 & NETFLX 1. Widevine? ‰ HDCP 2. HDCP 2.0 & NETFLIX?‰ Netflix ‰ Why HDCP2.0? 3. DTCP? Æ 추가 4. Changed BOMAs-Was Current LGE Internal Use Only Contents of LCD TV Standard Repair Process Page Contents of LCD TV Standard Repair Process Detail Technical ManualError symptom Content Replace T-con Board or module And Adjust VCOM Main B/D↔ Power B/D, LVDS Cable,Speaker Cable,IR B/D CableA2 Check Power Board 24v output Check Power Board 12v,3.5v etc Normal Y voltage? Check various voltages of Power BoardRevised date 3.5V,12V,20V or 24V… Check Check RF Signal levelS/W Version Check S/W Version ※ Check and Color error?A10/ A11 Check color by input -External Input COMPONENT -RGB External Input error Component error RGB error HDMI DVI External device screen error-Color errorVertical/Horizontal bar, residual image, light spot Replace Main B/D adjust VCOM Measure voltage of each output of Power B/D Check Power LEDPower LED Y On? Check Power On ‘”High” Power off List Error?Check Power Off Mode If Power Off mode is not displayed Check Power B/D voltage Normal of Power BoardCheck user menu Speaker off Check audio B+ Check audio B+ Voltage In case of External Input signal error Check and fix external device Power B/D don’t have problem Check & Repair Cable connection Connector solderCheck IR Output signal Check 3.5v on Power B/D Replace Power B/D or Replace Main B/D External Input and Recognition erroraccordance Identify nose type F. Exterior defect Adjust VCOM Page ALL MODELS Standard Repair Process Detail Technical Manual Edge LED 24 Pin Power Board ↔ Main BoardSMAW200-H24S YEONHO date 1. Checking method for remote controller for adjustment date Checking method date Appendix Exchange T-Con Board Noise Fuse Open, Abnormal power sectionAbnormal Display GRADATION No picture/Sound Ok Appendix Exchange PSULED driverNo Light Dim Light Un-repairable Cases In this case please exchange the module Appendix Exchange the Module Un-repairable Cases In this case please exchange the module Appendix Exchange the Module date For ’10 models, there is no voltage out for st-by purpose When st-by, only 3.5V is normally onEdge LED Edge LED Check “power on” pin is high B. Power error Off when on, off whiling viewing date Only for training and service purposesStandard Repair Process Detail Technical Manual ALL MODELS ALL MODELS Standard Repair Process Detail Technical Manual ALL MODELS LCD module change T-Con board change