LG Electronics 32LM640S/640T-ZA Standard Repair Process, date, Check audio B+ Voltage

Page 93

Check audio

Standard Repair Process

LCD TV

Error

symptom

C. Audio error	Established	2010. 12 .14
C. Audio error	date	2010. 12 .14
	date
Wrecked audio/ discontinuation/noise	Revised date		9/13

→abnormal audio/discontinuation/noise is same after “Check input signal” compared to No audio

☞A25

Check input signal -RF

-External Input signal

Signal normal?

N

Y

(When RF signal is not received)

	Wrecked audio/	Check and replace
	Discontinuation/
		speaker and
	Noise for
		connector
	all audio

Wrecked audio/ Discontinuation/

Noise only Replace Main B/D for D-TV

Wrecked audio/ Discontinuation/ Noise only

for Analog

Check audio

B+ Voltage (24V)

Y

Normal

voltage?

N

Replace Power B/D

Request repair to external cable/ANT provider

(In case of External Input signal error) Check and fix external device

Wrecked audio/ Discontinuation/ Noise only

for External Input

Connect and check other external device

Normal audio?

Y

Replace Main B/D

N

End

Check and fix external device

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

Image 93

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 Test4.0Msymbols/s to 7.2Msymbols/s Symbolratesymbolrate DVB-S2 8PSK / QPSK 2 ~ 45Msymbol/s6. 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 country6. USB S/W DownloadService only 5. Audio4.12. 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 Place at JACK SIDEPLACE AT JACK SIDE SMD Gaskit 12.5TGASKITSMDUSB112.5TGASKITSMDUSB3 PLACE AT JACK SIDE PLACE AT MAIN SOC SIDEPLACE AT IC6000 IC703 IC701 H5TQ2G63BFR-PBCH5TQ2G63BFR-PBC IC105 LGE2112Only for training and service purposes PowerDET FROM LIPS & POWER B/DPANELPOWER On-semiFor Debug Renesas MICOMMICOM MODEL OPTION Eye Sensor OptionUI HDMI3 HDMI1HDMI4 UI HDMI2SPDIF OUT RGB/ PC AUDIO/ SPDIFPC AUDIO JK3603 SLIM-15F-D-2JACKCOMMON ESD for MTKRS232C CVBS 1 PHONE JACKCOMPONENT 1 PHONE JACK Zener Diode is IR & KEYclose to wafer RGB Sensor+5VUSB FOR USB1 USBWIFIUSB1 USB2 MAX 1.5AFull Scart18 Pin Gender SCART GENDER2011.10.26 ALL MREMOTE OPTION ZigBeeRadio Pulse MREMOTE OPTIONAR4800 1/16WEthernet Block STA380BW IC5800GP4MT5369 2011.11.21AUDOUT EU/CHINAHOTELOPT SCART AUDIO MUTEIC6000 A Z4580MTR-E1HEADPHONE AMP EARPHONE AMPOption FOR LG1152 Option FOR MTKVout=0.6*1+R1/R2 T/C/S & H/NIM & T2/C TUNEREU & CHINATU6500 TU6501DVB-S2 LNB Part Allegro OptionLNBDCDCGND and AGND are connected DCDCGND and AGND are connected in pin#27FOR COMMERCIAL 12V OUT RS-232C 9 PIN OPTCOMMEREXT12V AUDIO OUT JACK OPTCOMMEREXTAMP COMMEREXTAMPJACKFOR COMMERCIAL AUDIO OUT OPTCOMMEREXTAMP COMMERCIALOPTION51Pin LVDS OUTPUT Connector 41Pin LVDS OUTPUT Connector LVDSLVDSHIGHMID 2011.08.11LOCAL DIMMING AR7600L/DIMOUT THIS IS REVERSE PATTERN POWER BLOCKLEVEL SHIFTER BLOCK T-ConeMMC I/F Don’t Connect Power At VDDIHYNIXEMMC2GB Just Interal LDO CapacitorLOGOLIGHT R8901 10K Place Near MicomPage 2012 LED/LCD TV Engineering guide Applicable Model XXLM760S-ZBNew 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 guideEPIEmbedded Point-Point Interface Features EPI InterfaceMerits HF mini-LVDS TCON EPI Interface mini-LVDS vs. EPIComparison What to changeHF mini-LVDS WIFI Main PCB for BroadbandxxLM760S-ZB Chassis LD22E PCB P/No EAX64307905Power load MTK5369 Block Diagram LM76Side RearMain SoC MTK Jack InterfaceFull Scart18 Pin Gender IC6100GP4 Backend block diagram EPI & T-con R 47옴R0 옴 EPI CH1/2/3 GP4 Backend block diagram EPI & T-ConEPI CH4/5/6 50PinLVDS Tx Block GP4 Backend block diagram LVDS Tx & Local DimmingDual-link LVDS Output LVDSSEL “H”=JEIDA, “L” or NC=VESA LGDPCBs InterconnectionCables xxLM760S-ZAAss’y Picture Pin Configuration Circuit Block Diagram2012Y IR + Soft touch PCB Pinmap KEY1, KEY2 VoltagePower LED Scenario 2012Y IR + Soft Touch LED Lighting ScenarioSpec 내용 Introductions of GP4 Sensor Touch IC Manual of Touch SensitivityTouch Key Threshold Level Ta = 25ºC Addr Value Touch EEPROM Register change with USB portIntroductions of 12Y RF ass’y + Magic Remote control ™ Pairing Information Transmission Send to TV after Paired 1. SystemPairing Information Transmission Sequence ™ Motion Data Transmissionmute powerhome ← ok →AA x 2 Battery 3. M4 Block DiagramPower Management Connector주요 Item 4. Function listManufacturer Function5. RF Pairing / Un-pairing Method MethodDescription Introductions of 12Y WIFI built in ass’y Block diagram WIFI Built in ass’y featureLGITPin map WIFI built in featureWIFI 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 & NETFLX1. Widevine? ‰ Netflix 2. HDCP 2.0 & NETFLIX?‰ Why HDCP2.0? ‰ HDCP3. DTCP? As-Was 4. Changed BOMCurrent Æ 추가4. Changed BOM Contents 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 VCOMRevised date Check various voltages of Power Board3.5V,12V,20V or 24V… Normal Y voltage?Check RF Signal level CheckS/W Version Check S/W Version A10/ A11 Color error?Check color by input -External Input COMPONENT -RGB ※ Check andVertical/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 ListCheck user menu Speaker off of Power BoardCheck audio B+ NormalCheck audio B+ Voltage In case of External Input signal error Check and fix external deviceCheck 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 External Input andaccordance Identify nose type F. Exterior defect Adjust VCOMError symptom ALL MODELS Standard Repair Process Detail Technical Manual24 Pin Power Board ↔ Main Board Edge LEDSMAW200-H24S YEONHO Standard Repair Process Detail Technical Manual 1. Checking method for remote controller for adjustment Standard Repair Process Detail Technical Manual Checking method Standard Repair Process Detail Technical Manual Appendix Exchange T-Con Board Abnormal Display Fuse Open, Abnormal power sectionGRADATION NoiseNo Light Appendix Exchange PSULED driverDim Light No picture/Sound OkUn-repairable Cases In this case please exchange the module Appendix Exchange the ModuleUn-repairable Cases In this case please exchange the module Appendix Exchange the ModuleStandard Repair Process Detail Technical Manual When st-by, only 3.5V is normally on For ’10 models, there is no voltage out for st-by purposeEdge LED Edge LED Check “power on” pin is high B. Power error Off when on, off whiling viewing Standard Repair Process Detail Technical Manual Only for training and service purposesALL MODELS dateALL MODELS Standard Repair Process Detail Technical ManualALL MODELS LCD module change T-Con board change