Manuals / LG Electronics / TV and Video / Flat Panel Television

LG Electronics 640T-ZA Standard Repair Process, Revised date, 3.5V,12V,20V or 24V…

Models: 32LM640S/640T-ZA 640T-ZA

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Standard Repair Process

	Error	A. Video error	Established	2010. 12 .14
LCD TV	Error	A. Video error	date	2010. 12 .14
LCD TV	symptom	No video/ No audio	Revised date		2/13
		No video/ No audio	Revised date		2/13

No Video/ No audio

☞A4

Check various voltages of Power Board

( 3.5V,12V,20V or 24V…)

Normal Y voltage?

Replace Power Board and repair parts

Check and replace

MAIN B/D

End

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

Page 85

Image 85

LG Electronics 640T-ZA service manual Standard Repair Process, Revised date, 3.5V,12V,20V or 24V…, Normal Y voltage?

Contents

32LM640S/640T-ZA MODEL 32LM640S/640TSERVICE MANUAL LED LCD TVOnly for training and service purposes CONTENTSCopyright LG Electronics. Inc. All rights reservedIMPORTANT SAFETY NOTICE SAFETY PRECAUTIONSBefore returning the receiver to the customer Leakage Current Cold CheckAntenna Cold CheckElectrostatically Sensitive ES Devices SERVICING PRECAUTIONSReplacement IC Remove/ReplacementSmall-Signal Discrete Transistor Removal/Replacement Removal4. Model General Specification SPECIFICATION1. Application range 2. Requirement for TestSymbolrate Specification4.0Msymbols/s to 7.2Msymbols/s symbolrate6. RGB input PC 5. Component Video Input Y, Cb/Pb, Cr/Pr7.2. PC mode 7. HDMI Input 7.1. DTV mode3. Automatic Adjustment ADJUSTMENT INSTRUCTION1. Application Range 2. Designation3.4. LAN PORT INSPECTIONPING TEST 3.2. MAC address D/L, CI+ key D/L, Widevine key D/L, ESN D/LSET PC 3.3. LAN3.5. Model name & Serial number Download 3.7. WIFI MAC ADDRESS CHECK3.6. CI+ Key checking method 3.5.1. Model name & Serial number D/L4.1.1. Overview 4. Manual Adjustment4.1.2. Equipment 4.1.3. Download method4.2.4. Adj. Command Protocol 4.2. White Balance Adjustment4.2.1. Overview 4.2.2. Equipment4.3. EYE-Q function check 4.5. Magic Motion Remote control test4.4. Local Dimming Function Check 4.2.7. LED White balance table4.6. 3D function test 4.7. Wi-Fi Test4.8. LNB voltage and 22KHz tone check 4.9. Option selection per country5. Audio 6. USB S/W DownloadService only4.12. GND and Internal Pressure check Side BLOCK DIAGRAMRear HDMIIMPORTANT SAFETY NOTICE EXPLODED VIEWNVRAM EAX6430790* LD22* / LC22 EAX6443420* LT22* / LJ22* / LA22* / LB22X-TAL JTAG 10KPLACE AT JACK SIDE Only for training and service purposesPlace at JACK SIDE PLACE AT JACK SIDEOnly for training and service purposes SMD GaskitCopyright 2012 LG Electronics. Inc. All rights reserved LGE Internal Use OnlyPLACE AT MAIN SOC SIDE PLACE AT JACK SIDEPLACE AT IC6000 Only for training and service purposesCopyright 2012 LG Electronics. Inc. All rights reserved Only for training and service purposesLGE Internal Use Only IC701 H5TQ2G63BFR-PBCCopyright 2012 LG Electronics. Inc. All rights reserved Only for training and service purposesLGE Internal Use Only PowerDET FROM LIPS & POWER B/DPANELPOWER On-semiFor Debug Renesas MICOMMICOM MODEL OPTION Eye Sensor OptionHDMI1 Only for training and service purposesUI HDMI3 HDMI4RGB/ PC AUDIO/ SPDIF Only for training and service purposesSPDIF OUT PC AUDIOESD for MTK Only for training and service purposesCopyright 2012 LG Electronics. Inc. All rights reserved LGE Internal Use OnlyRS232C Only for training and service purposesCVBS 1 PHONE JACK COMPONENT 1 PHONE JACKZener Diode is IR & KEYclose to wafer Only for training and service purposes+5VUSB FOR USB1 USBWIFIUSB1 USB2 MAX 1.5AFull Scart18 Pin Gender Only for training and service purposesCopyright 2012 LG Electronics. Inc. All rights reserved LGE Internal Use OnlyALL MREMOTE OPTION ZigBeeRadio Pulse MREMOTE OPTIONOnly for training and service purposes AR4800Only for training and service purposes Ethernet BlockESD for MTK ESD for LG1152IC5800 Only for training and service purposesSTA380BW GP4MT5369SCART AUDIO MUTE Only for training and service purposesCopyright 2012 LG Electronics. Inc. All rights reserved LGE Internal Use OnlyOnly for training and service purposes EARPHONE AMPHEADPHONE AMP Copyright 2012 LG Electronics. Inc. All rights reservedOption FOR LG1152 Option FOR MTKOnly for training and service purposes Copyright 2012 LG Electronics. Inc. All rights reservedOnly for training and service purposes T/C/S & H/NIM & T2/C TUNEREU & CHINAVout=0.6*1+R1/R2 TU6500Only for training and service purposes OptionLNBDVB-S2 LNB Part Allegro DCDCGND and AGND are connectedFOR COMMERCIAL 12V OUT RS-232C 9 PIN OPTCOMMEREXT12V AUDIO OUT JACK OPTCOMMEREXTAMP COMMEREXTAMPJACKFOR COMMERCIAL AUDIO OUT OPTCOMMEREXTAMP Only for training and service purposesOnly for training and service purposes LVDS51Pin LVDS OUTPUT Connector 41Pin LVDS OUTPUT Connector Copyright 2012 LG Electronics. Inc. All rights reservedOnly for training and service purposes LOCAL DIMMINGAR7600 1/16WTHIS IS REVERSE PATTERN POWER BLOCKLEVEL SHIFTER BLOCK Only for training and service purposeseMMC I/F Don’t Connect Power At VDDIOnly for training and service purposes HYNIXEMMC2GBPlace Near Micom Only for training and service purposesCopyright 2012 LG Electronics. Inc. All rights reserved LGE Internal Use OnlyPage Only for training and service purposes Applicable Model XXLM760S-ZB2012 LED/LCD TV Engineering guide Copyright 2012 LG Electronics. Inc. All rights reservedNew features Main PCBs Block Diagrams, IIC Map CONTENTInstruction of new sub ass’ys How to use tool Download Adjust way of new features widevine… Repair guideEPI Interface EPIEmbedded Point-Point Interface FeaturesMerits HF mini-LVDS TCON EPI Interface mini-LVDS vs. EPIComparison What to changeHF mini-LVDS EPI Interface mini-LVDS vs. EPIWIFI Main PCB for BroadbandOnly for training and service purposes xxLM760S-ZBPower load MTK5369 Block Diagram LM76Side RearOnly for training and service purposes Jack InterfaceMain SoC MTK Full Scart18 Pin GenderOnly for training and service purposes GP4 Backend block diagram EPI & T-conR 47옴 Copyright 2012 LG Electronics. Inc. All rights reservedEPI CH1/2/3 GP4 Backend block diagram EPI & T-ConEPI CH4/5/6 Only for training and service purposesLVDS Tx Block GP4 Backend block diagram LVDS Tx & Local DimmingOnly for training and service purposes Dual-link LVDS OutputPCBs InterconnectionCables xxLM760S-ZAAss’y Picture Pin Configuration Circuit Block Diagram2012Y IR + Soft touch PCB Pinmap KEY1, KEY2 Voltage2012Y 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 portIntroductions of GP4 Sensor Touch IC Only for training and service purposes Introductions of 12Y RF ass’y + Magic Remote controlCopyright 2012 LG Electronics. Inc. All rights reserved LGE Internal Use Only™ Pairing Information Transmission Send to TV after Paired 1. SystemPairing Information Transmission Sequence ™ Motion Data Transmissionpower powermute homeAA x 2 Battery 3. M4 Block DiagramPower Management Connector주요 Item 4. Function listManufacturer FunctionMethod 5. RF Pairing / Un-pairing MethodDescription Only for training and service purposes Introductions of 12Y WIFI built in ass’yCopyright 2012 LG Electronics. Inc. All rights reserved LGE Internal Use OnlyBlock diagram WIFI Built in ass’y featureLGITPin map WIFI built in featureOnly for training and service purposes WIFI Built in Block-diagramArcadyanCopyright 2012 LG Electronics. Inc. All rights reserved LGE Internal Use OnlyOnly for training and service purposes WIFI Built in ass’y SpecificationCopyright 2012 LG Electronics. Inc. All rights reserved LGE Internal Use Only1. Widevine? 2. HDCP 2.0 & NETFLIX? 3. DTCP? 4. Changed BOM 12Y Widevine & HDCP 2.0 & NETFLXOnly for training and service purposes Copyright 2012 LG Electronics. Inc. All rights reserved1. Widevine? ‰ Netflix 2. HDCP 2.0 & NETFLIX?‰ Why HDCP2.0? ‰ HDCP3. DTCP? As-Was 4. Changed BOMCurrent Only for training and service purposes4. Changed BOM Only for training and service purposesCopyright 2012 LG Electronics. Inc. All rights reserved LGE Internal Use OnlyContents of LCD TV Standard Repair Process Error symptom Contents of LCD TV Standard Repair Process Detail Technical ManualContent PageA2 Check Power Board 24v output Main B/D↔ Power B/D, LVDS Cable,Speaker Cable,IR B/D CableCheck Power Board 12v,3.5v etc Replace T-con Board or module And Adjust VCOMOnly for training and service purposes Check various voltages of Power BoardStandard Repair Process dateCheck Check RF Signal levelS/W Version Check S/W Version Check RF Signal levelColor error? Color error?Color error? A10/ A11Vertical/Horizontal bar, residual image, light spot External device screen error-Color errorReplace Main B/D adjust VCOM External Input error Component error RGB error HDMI DVIPower LED Y On? Check Power LEDCheck Power On ‘”High” Measure voltage of each output of Power B/DCheck Power Off Mode Error?If Power Off mode is not displayed Check Power B/D voltage Power off ListOnly for training and service purposes of Power BoardStandard Repair Process dateStandard Repair Process In case of External Input signal error Check and fix external devicedate Check audio B+ VoltageCheck IR Output signal Check & Repair Cable connection Connector solderCheck 3.5v on Power B/D Replace Power B/D or Replace Main B/D Power B/D don’t have problemRecognition error Recognition errorOnly for training and service purposes Standard Repair ProcessIdentify nose type F. Exterior defect Adjust VCOMLCD TV Error symptom Contents of LCD TV Standard Repair Process Detail Technical ManualContent PageALL MODELS Standard Repair Process Detail Technical ManualStandard Repair Process Detail Technical Manual 24 Pin Power Board ↔ Main BoardEdge LED SMAW200-H24S YEONHOStandard Repair Process Detail Technical Manual Only for training and service purposesALL MODELS dateOnly for training and service purposes 1. Checking method for remote controller for adjustmentStandard Repair Process Detail Technical Manual ALL MODELSStandard Repair Process Detail Technical Manual Only for training and service purposesALL MODELS dateALL MODELS Standard Repair Process Detail Technical ManualChecking method Standard Repair Process Detail Technical Manual Only for training and service purposesdate dateAppendix Exchange T-Con Board Abnormal Power Section Abnormal Power SectionFuse Open, Abnormal power section Only for training and service purposesOnly for training and service purposes Appendix Exchange PSULED driverNo Light Dim LightUn-repairable Cases In this case please exchange the module Appendix Exchange the ModuleOnly for training and service purposes Copyright 2012 LG Electronics. Inc. All rights reservedUn-repairable Cases In this case please exchange the module Appendix Exchange the ModuleStandard Repair Process Detail Technical Manual Only for training and service purposesdate dateStandard Repair Process Detail Technical Manual When st-by, only 3.5V is normally onFor ’10 models, there is no voltage out for st-by purpose Edge LED Edge LEDStandard Repair Process Detail Technical Manual Check “power on” pin is highEdge LED Edge LED SMAW200-H24S YEONHOOnly for training and service purposes B. Power error Off when on, off whiling viewingStandard Repair Process Detail Technical Manual ALL MODELSStandard Repair Process Detail Technical Manual Only for training and service purposesALL MODELS dateALL MODELS Standard Repair Process Detail Technical ManualALL MODELS Standard Repair Process Detail Technical ManualLCD module change T-Con board change Standard Repair Process Detail Technical Manual