LG 42LM620T-ZE User Manual

Printed in KoreaP/NO : MFL67360910 (1203-REV00)CHASSIS : LD22EMODEL : 42LM620S/620T/625SMODEL : 42LM620S/620T-ZE 42LM625S-ZGCAUTIONBEFORE SERVICING

- 10 -LGE Internal Use OnlyCopyright © LG Electronics. Inc. All rights reserved.Only for training and service purposesADJUSTMENT INSTRUCTION1. App

Entry method 1. Press the ADJ button on the remote controller for adjustment.2. Enter into White Balance of item 6. 3. After recording the R, G, B (GA

Standard Repair Process Detail Technical ManualPower Board voltage measuring methodA. Video error_No video/ AudioA5Established date Revised date Error

MENU -Æ Set up Æ support -Æ signal test-Æ select channel When the signal is strong, use the attenuator (-10dB, -15dB, -20dB etc.)Standard Repair Proce

Standard Repair Process Detail Technical ManualLCD-TV Version checking methodA. Video error_Video error, video lag/stop 1. Checking method for remote

Standard Repair Process Detail Technical ManualLCD TV connection diagram (1)A. Video error _Vertical/Horizontal bar, residual image, light spot As the

Checking method: 1. Check the signal strength or check whether the screen is normal when the external device is connected. 2. After measuring each vol

Standard Repair Process Detail Technical ManualAdjustment Test pattern - ADJ KeyA. Video error_Color error You can view 6 types of patterns using the

Solder defect, CNT BrokenT-Con Defect, CNT BrokenT-Con Defect, CNT BrokenT-Con Defect, CNT BrokenSolder defect, CNT BrokenSolder defect, CNT BrokenSol

Abnormal Power SectionSolder defect, Short/CrackAbnormal Power SectionSolder defect, Short/CrackFuse Open, Abnormal power sectionNoiseGRADATIONGRADATI

Appendix : Exchange PSU(LED driver)No LightDim LightDim LightDim LightNo picture/Sound OkCopyright © 2012 LG Electronics. Inc. All rights reserved. On

- 11 -LGE Internal Use OnlyCopyright © LG Electronics. Inc. All rights reserved.Only for training and service purposes3.2. MAC address D/L, CI+ k

Appendix : Exchange the Module (1)Panel Mura, Light leakagePress damageCrosstalkCrosstalkPress damagePanel Mura, Light leakagePress damageUn-repairabl

Vertical BlockSource TAB IC DefectHorizontal BlockGate TAB IC DefectGate TAB IC DefectGate TAB IC DefectVertical LineSource TAB IC DefectVertical Bloc

Standard Repair Process Detail Technical ManualCheck front display LEDB. Power error _No powerA17Established date Revised date Error symptomContentLCD

Standard Repair Process Detail Technical ManualCheck power input voltage and ST-BY 5VB. Power error _No powerA18Established date Revised date Error sy

Standard Repair Process Detail Technical ManualChecking method when power is ONB. Power error _No powerA19Established date Revised date Error symptomC

Entry method1. Press the IN-START button of the remote controller for adjustment2. Check the entry into adjustment item 3Standard Repair Process Detai

Checking method1. Press the MENU button on the remote controller2. Select the AUDIO function of the Menu3. Select TV Speaker from Off to OnStandard Re

Checking order when there is no audio① Check the contact condition of or 24V connector of Main Board② Measure the 24V input voltage supplied from Powe

Checking order1, 2. Check IR cable condition between IR & Main board.3. Check the st-by 3.3V on the terminal 6.4. When checking the Pre-

Standard Repair Process Detail Technical ManualSequence of the Vcom adjustmentD. VCOM Adjustment1. Case LCD module change T-Con board change 2. Equ

- 12 -LGE Internal Use OnlyCopyright © LG Electronics. Inc. All rights reserved.Only for training and service purposes3.5. Model name & Serial

- 13 -LGE Internal Use OnlyCopyright © LG Electronics. Inc. All rights reserved.Only for training and service purposes4. Manual Adjustment* ADC

- 14 -LGE Internal Use OnlyCopyright © LG Electronics. Inc. All rights reserved.Only for training and service purposes4.2. White Balance Adjustmen

- 15 -LGE Internal Use OnlyCopyright © LG Electronics. Inc. All rights reserved.Only for training and service purposes▪ Adjustment condition and c

- 16 -LGE Internal Use OnlyCopyright © LG Electronics. Inc. All rights reserved.Only for training and service purposes4.6. 3D function test(Patter

- 17 -LGE Internal Use OnlyCopyright © LG Electronics. Inc. All rights reserved.Only for training and service purposes4.12. GND and Internal Press

- 18 -LGE Internal Use OnlyCopyright © LG Electronics. Inc. All rights reserved.Only for training and service purposes Screw specification and ap

- 19 -LGE Internal Use OnlyCopyright © LG Electronics. Inc. All rights reserved.Only for training and service purposesL/R InSPDIF OUTUSBAudioAMP(

- 2 -LGE Internal Use OnlyCopyright © LG Electronics. Inc. All rights reserved.Only for training and service purposesCONTENTSCONTENTS ...

- 20 -LGE Internal Use OnlyCopyright © LG Electronics. Inc. All rights reserved.Only for training and service purposesA7A2A21A5A10AG19003002004005

THE SYMBOL MARK OF THIS SCHEMETIC DIAGRAM INCORPORATESSPECIAL FEATURES IMPORTANT FOR PROTECTION FROM X-RADIATION.FILRE AND ELECTRICAL SHOCK HAZARDS

THE SYMBOL MARK OF THIS SCHEMETIC DIAGRAM INCORPORATESSPECIAL FEATURES IMPORTANT FOR PROTECTION FROM X-RADIATION.FILRE AND ELECTRICAL SHOCK HAZARDS

THE SYMBOL MARK OF THIS SCHEMETIC DIAGRAM INCORPORATESSPECIAL FEATURES IMPORTANT FOR PROTECTION FROM X-RADIATION.FILRE AND ELECTRICAL SHOCK HAZARDS

THE SYMBOL MARK OF THIS SCHEMETIC DIAGRAM INCORPORATESSPECIAL FEATURES IMPORTANT FOR PROTECTION FROM X-RADIATION.FILRE AND ELECTRICAL SHOCK HAZARDS

THE SYMBOL MARK OF THIS SCHEMETIC DIAGRAM INCORPORATESSPECIAL FEATURES IMPORTANT FOR PROTECTION FROM X-RADIATION.FILRE AND ELECTRICAL SHOCK HAZARDS

THE SYMBOL MARK OF THIS SCHEMETIC DIAGRAM INCORPORATESSPECIAL FEATURES IMPORTANT FOR PROTECTION FROM X-RADIATION.FILRE AND ELECTRICAL SHOCK HAZARDS

THERMALTHERMALTHERMALTHERMALTHE SYMBOL MARK OF THIS SCHEMETIC DIAGRAM INCORPORATESSPECIAL FEATURES IMPORTANT FOR PROTECTION FROM X-RADIATION.FILRE

THE SYMBOL MARK OF THIS SCHEMETIC DIAGRAM INCORPORATESSPECIAL FEATURES IMPORTANT FOR PROTECTION FROM X-RADIATION.FILRE AND ELECTRICAL SHOCK HAZARDS

THE SYMBOL MARK OF THIS SCHEMETIC DIAGRAM INCORPORATESSPECIAL FEATURES IMPORTANT FOR PROTECTION FROM X-RADIATION.FILRE AND ELECTRICAL SHOCK HAZARDS

- 3 -LGE Internal Use OnlyCopyright © LG Electronics. Inc. All rights reserved.Only for training and service purposesMany electrical and mechanica

Fiber OpticTHE SYMBOL MARK OF THIS SCHEMETIC DIAGRAM INCORPORATESSPECIAL FEATURES IMPORTANT FOR PROTECTION FROM X-RADIATION.FILRE AND ELECTRICAL SH

THE SYMBOL MARK OF THIS SCHEMETIC DIAGRAM INCORPORATESSPECIAL FEATURES IMPORTANT FOR PROTECTION FROM X-RADIATION.FILRE AND ELECTRICAL SHOCK HAZARDS

THE SYMBOL MARK OF THIS SCHEMETIC DIAGRAM INCORPORATESSPECIAL FEATURES IMPORTANT FOR PROTECTION FROM X-RADIATION.FILRE AND ELECTRICAL SHOCK HAZARDS

THE SYMBOL MARK OF THIS SCHEMETIC DIAGRAM INCORPORATESSPECIAL FEATURES IMPORTANT FOR PROTECTION FROM X-RADIATION.FILRE AND ELECTRICAL SHOCK HAZARDS

USB DOWN STREAMUSB DOWN STREAMUSB DOWN STREAMTHERMALTHERMALTHERMALTHE SYMBOL MARK OF THIS SCHEMETIC DIAGRAM INCORPORATESSPECIAL FEATURES IMPORTANT

THE SYMBOL MARK OF THIS SCHEMETIC DIAGRAM INCORPORATESSPECIAL FEATURES IMPORTANT FOR PROTECTION FROM X-RADIATION.FILRE AND ELECTRICAL SHOCK HAZARDS

THE SYMBOL MARK OF THIS SCHEMETIC DIAGRAM INCORPORATESSPECIAL FEATURES IMPORTANT FOR PROTECTION FROM X-RADIATION.FILRE AND ELECTRICAL SHOCK HAZARDS

THE SYMBOL MARK OF THIS SCHEMETIC DIAGRAM INCORPORATESSPECIAL FEATURES IMPORTANT FOR PROTECTION FROM X-RADIATION.FILRE AND ELECTRICAL SHOCK HAZARDS

THERMALTHE SYMBOL MARK OF THIS SCHEMETIC DIAGRAM INCORPORATESSPECIAL FEATURES IMPORTANT FOR PROTECTION FROM X-RADIATION.FILRE AND ELECTRICAL SHOCK

THE SYMBOL MARK OF THIS SCHEMETIC DIAGRAM INCORPORATESSPECIAL FEATURES IMPORTANT FOR PROTECTION FROM X-RADIATION.FILRE AND ELECTRICAL SHOCK HAZARDS

- 4 -LGE Internal Use OnlyCopyright © LG Electronics. Inc. All rights reserved.Only for training and service purposesSERVICING PRECAUTIONSCAUTION:

THE SYMBOL MARK OF THIS SCHEMETIC DIAGRAM INCORPORATESSPECIAL FEATURES IMPORTANT FOR PROTECTION FROM X-RADIATION.FILRE AND ELECTRICAL SHOCK HAZARDS

THE SYMBOL MARK OF THIS SCHEMETIC DIAGRAM INCORPORATESSPECIAL FEATURES IMPORTANT FOR PROTECTION FROM X-RADIATION.FILRE AND ELECTRICAL SHOCK HAZARDS

THERMALTHE SYMBOL MARK OF THIS SCHEMETIC DIAGRAM INCORPORATESSPECIAL FEATURES IMPORTANT FOR PROTECTION FROM X-RADIATION.FILRE AND ELECTRICAL SHOCK

THERMALTHE SYMBOL MARK OF THIS SCHEMETIC DIAGRAM INCORPORATESSPECIAL FEATURES IMPORTANT FOR PROTECTION FROM X-RADIATION.FILRE AND ELECTRICAL SHOCK

THE SYMBOL MARK OF THIS SCHEMETIC DIAGRAM INCORPORATESSPECIAL FEATURES IMPORTANT FOR PROTECTION FROM X-RADIATION.FILRE AND ELECTRICAL SHOCK HAZARDS

THE SYMBOL MARK OF THIS SCHEMETIC DIAGRAM INCORPORATESSPECIAL FEATURES IMPORTANT FOR PROTECTION FROM X-RADIATION.FILRE AND ELECTRICAL SHOCK HAZARDS

THE SYMBOL MARK OF THIS SCHEMETIC DIAGRAM INCORPORATESSPECIAL FEATURES IMPORTANT FOR PROTECTION FROM X-RADIATION.FILRE AND ELECTRICAL SHOCK HAZARDS

THERMALTHERMALTHE SYMBOL MARK OF THIS SCHEMETIC DIAGRAM INCORPORATESSPECIAL FEATURES IMPORTANT FOR PROTECTION FROM X-RADIATION.FILRE AND ELECTRICAL

THE SYMBOL MARK OF THIS SCHEMETIC DIAGRAM INCORPORATESSPECIAL FEATURES IMPORTANT FOR PROTECTION FROM X-RADIATION.FILRE AND ELECTRICAL SHOCK HAZARDS

THE SYMBOL MARK OF THIS SCHEMETIC DIAGRAM INCORPORATESSPECIAL FEATURES IMPORTANT FOR PROTECTION FROM X-RADIATION.FILRE AND ELECTRICAL SHOCK HAZARDS

- 5 -LGE Internal Use OnlyCopyright © LG Electronics. Inc. All rights reserved.Only for training and service purposesIC Remove/ReplacementSome cha

2012 LED/LCD TVEngineering guide< Applicable Model >XXLM760S-ZBCopyright © 2012 LG Electronics. Inc. All rights reserved. Only for training and

◈ CONTENT ◈New features Main PCBs Block Diagrams, IIC Map Structure of TV set and connection of sub ass’ysNew sub ass’ys- Instruction of new sub ass’y

EPI InterfaceEPI(Embedded Point-Point Interface)Features• Point-Point topology (support 2 Pair option)• CDR (Clock Data Recovery)• Bandwidth up to

EPI Interface (mini-LVDS vs. EPI)ComparisonHF mini-LVDSWhat to changeEPI (Embedded clock P-to-P Interface)-Difficult to upgrade bandwidth limit-Multip

HF mini-LVDS EPITopologyProtocolFeatures@10bit, FHD120• Multi Drop• Data rate: 660Mbps• External clock• Point to Point• Data rate : 1.8Gbps• Embedded

Main PCB for BroadbandMain + TCON all in oneTo PSU12641Main processor, DDR MemoryeMMC Memory234Micom for Key/IR sensing PMICAudio AMP (10W+10W)xxLM760

MTK5369 Block Diagram( LM76 )L/R InSPDIF OUTUSBAudioAMP(NTP7500 or STA)I2S OutMTKCI slotCI slotP_TSCVBSP_TST/C DemodIF(+/-)USB1RS-232CPC-RGBPC-AUDIOO

Jack Interface[PR0P],[PB0P],[Y0P][OPCTRL8][VDACX_OUT][VDACY_OUT][AUOUTL0][ADIN0_SRV][CVBS2P][AIN0_L_ADDC][AIN0_R_AADC][SPDIF_OUT][AUOUTR0]Main SoCMTK[

GP4 Backend block diagram (EPI & T-con)IC7700TPS65178IC7701TPS6519850PinEPI LEFT50PinEPI RIGHTVCOM, GIP_RSTR(0옴)OPTDISCHGVGL_IVGL_IVGH_ODD, VGH_EV

- 6 -LGE Internal Use OnlyCopyright © LG Electronics. Inc. All rights reserved.Only for training and service purposesSPECIFICATIONNOTE : Specifica

GP4 Backend block diagram (EPI & T-Con)Main SoCMTKIC7700TPS6517850PinEPI LEFT50PinEPI RIGHTGMA[1][3][9][10][12][14][15][16][18]GMA[4][5][7][12][15

GP4 Backend block diagram (LVDS Tx & Local Dimming)LVDS Tx BlockMain SoCMTKLVDS_SELBIT_SEL_LOW51PinLVDSOutputPANEL_VCC (+12V)41PinLVDSOutput10-bit

Interconnection - 11Main PCB2Power Board3Tact key PCBT-con Driver12345Main / LPB 24Pin cable Main / Module EPI cable 50& 50PIN LED driver / PSU10P

2012Y IR + Soft touch PCB PinmapCircuit Block DiagramPin ConfigurationKEY1, KEY2 Voltage(Tolerance of voltage ±0.2V)Ass’y PictureCopyright © 2012 LG E

2012Y IR + Soft Touch LED Lighting Scenario구분Spec 내용비고PowerIndicator UI- 12Y GP4 High(L9), GP4 Mid(MTK), GP4 Low(S7LR2)Æ“ Power Light” UI Delete compa

Introductions of GP4 Sensor (Touch IC)Touch Key Threshold Level (Ta = 25ºC )1. Verify the number of THR at first.2. Once you correctly touch Touch bu

Introductions of GP4 Sensor (Touch IC)Touch EEPROM Register change with USB port1. Write all of the address, value (Hex) as a below. capable of only

Introductions of 12Y RF ass’y + Magic Remote control Copyright © 2012 LG Electronics. Inc. All rights reserved. Only for training and service purposes

1. SystemRemoteRF ReceiverTVUART or USBRF Pairing Information Transmission (Send to TV after Paired)• Static Calibration Data (Bypass only)• Rem

2. Remote Buttons (M3 vs. M4)BUTTONRF UnpairedIR_CODERF PairedRF_CODEIR continuousrepeatETC.Phsical ButtonsPOWER 0x08 0x08 Y IR onlyBACK 0x28 0x8028 Y

- 7 -LGE Internal Use OnlyCopyright © LG Electronics. Inc. All rights reserved.Only for training and service purposesNo. Item Specication Remarks

MPU-3050 (Gyro)(Invensense)LIS331DLH(Accel.)(STMicro)BCM20733M(BROADCOM) Bluetooth 3.0Key Button( 4 x 5 )AA x 2 BatteryDC-DC 2.8V LDOPower ManagementB

주요 Item IC Manufacturer FunctionRemoconVoiceVoice Codec WM8950 Wolfson 16KHz Sampling of Audio dataMEMS Mic. SPU0414HR5H Knowles Sensing Voice Motion

5. RF Pairing / Un-pairing MethodMethod DescriptionRF Pairing Method1– If unpaired, just press "OK" button.– If paired, press "OK"

Introductions of 12Y WIFI built in ass’yCopyright © 2012 LG Electronics. Inc. All rights reserved. Only for training and service purposesLGE Internal

WIFI Built in ass’y feature(LGIT)WIFI built in featurePIN USB interface1 5V2 DM3 DP4 GND-Pin map- Block diagramCopyright © 2012 LG Electronics. Inc. A

WIFI Built in Block-diagram(Arcadyan)Copyright © 2012 LG Electronics. Inc. All rights reserved. Only for training and service purposesLGE Internal Use

WIFI Built in ass’y SpecificationCopyright © 2012 LG Electronics. Inc. All rights reserved. Only for training and service purposesLGE Internal Use Onl

12Y Widevine & HDCP 2.0 & NETFLX 1. Widevine?2. HDCP 2.0 & NETFLIX?3. DTCP?4. Changed BOMCopyright © 2012 LG Electronics. Inc. All righ

1. Widevine?[Widevine]Widevine is the Solution(Library) offering Adaptive Streaming and DRM.In BBTV, when special CP do service, this module is requir

 HDCP9High-bandwidth Digital Content Protection9 Protect high-value digital motion pictures, television programs and audio against unauthorized inter

- 8 -LGE Internal Use OnlyCopyright © LG Electronics. Inc. All rights reserved.Only for training and service purposes5. Component Video Input (Y,

3. DTCP?[DTCP]The Digital Transmission Content Protection Specification defines a cryptogrphic protocol for protecting audio/video entertainment conte

4. Changed BOMAs-Was CurrentÆ 추가 Add Item1.Marlin (Yes/No)2.CNTV (Yes/No)3.HDCP Tx (Yes/No)4.DTCP Rx (Yes/No)5.HDCP Rx (Yes/No)주3) CNTV [Yes] : China

4. Changed BOMCopyright © 2012 LG Electronics. Inc. All rights reserved. Only for training and service purposesLGE Internal Use Only

Contents of LCD TV Standard Repair ProcessNo. Error symptom (High category) Error symptom (Mid category) Page Remarks1A. Video errorNo video/Normal au

Contents of LCD TV Standard Repair Process Detail Technical ManualNo. Error symptom Content Page Remarks1A. Video error_ No video/Normal audio Check L

Normal audioYNMove to No video/No audioNo videoNormal audioCheck Back LightOn with naked eyeOnYNCheck Power Board12v,3.5v etc.Normal voltageYNReplace

Normalvoltage?Check various voltages of Power Board ( 3.5V,12V,20V or 24V…)No Video/No audioCheck and replace MAIN B/DYReplace Power Board and repair

A. Picture ProblemPicture broken/ FreezingYN☞ A6NCheck RF Signal levelNormal Signal?Check RF Cable Connection1. Reconnection2. Install BoosterCheckS/W

A. Picture Problem (DVB-S/S2)Tuning fail, Picture broken/ FreezingYN☞ A6Check RF Signal levelNormal Signal?CheckS/W VersionS/W UpgradeSVC Bulletin?Nor

Colorerror?YN※ Check and replace Link Cable(LVDS) and contact conditionYNReplace Main B/DColorerror?Check error color input modeCheck color by input-E

- 9 -LGE Internal Use OnlyCopyright © LG Electronics. Inc. All rights reserved.Only for training and service purposes7. HDMI Input7.1. DTV modeNo.

Screennormal?NYCheck external device connection conditionYNCheck and replace Link CableNormal?YNScreennormal?Replace Main B/D(adjust VCOM)Replace modu

B. Power errorNo powerPower LEDOn?YNDC Power onby pressing Power Key On Remote controlYNNormal operation?Check Power On ‘”High”Check Power cordwas in

B. Power errorOff when on, off while viewing, power auto on/offError?NYCheck Power OffModeFix A/C cord & Outlet and check each 3 phase outCheck A/

No audioScreen normalCheck user menu > Speaker offOffNYCancel OFF Check audio B+ 24V of Power BoardNormalvoltageYNReplace Power Board and repair p

→ abnormal audio/discontinuation/noise is same after “Check input signal” compared to No audioC. Audio errorWrecked audio/ discontinuation/noise Wreck

D. General Function ProblemRemote control & Local switch checkingYN1. Remote control(R/C) operating errorCheck R/C itself OperationNormaloperating

Check technical information- Fix information- S/W VersionNYTechnical information?Check input signalSignalinput?YNExternal Input andComponentRecognitio

Check location of noiseIdentify nose typeCircuit noiseReplace PSU(with LED driver)Replace LED driver Mechanical noiseCheck location of noiseOR※ When t

Replace moduleZoom part with exterior damageModuledamageCabinetdamageReplace cabinetReplace remote controllerRemote controllerdamageStanddentReplace s

Contents of LCD TV Standard Repair Process Detail Technical ManualNo. Error symptom Content Page Remarks21B. Power error_No powerCheck front display L