LG 55UJ634V Service Manual Download Page 58

Page: 58 / 101

Standard Repair Process Detail Technical Manual

Check Link Cable(FFC) reconnection condition

A. Video error_Color error

Check the contact condition of the Link Cable, especially dust or mis insertion.

Established

date

Revised

date

Error

symptom

Content

Only for training and service purposes.

Summary of Contents for 55UJ634V

Page 1: ...L 55UJ634V 55UJ634V ZD 55UJ635V 55UJ635V ZF CAUTION BEFORE SERVICING THE CHASSIS READ THE SAFETY PRECAUTIONS IN THIS MANUAL LED TV SERVICE MANUAL CONFIDENTIAL Copyright 2017 LG Electronics Inc All rights reserved Only training and service purposes ...

Page 2: ...rights reserved Only training and service purposes CONTENTS CONTENTS 2 SAFETY PRECAUTIONS 3 SERVICING PRECAUTIONS 4 SPECIFICATION 6 SOFTWARE UPDATE 11 BLOCK DIAGRAM 12 EXPLODED VIEW 25 DISASSEMBLY GUIDE 26 TROUBLE SHOOTING GUIDE APPENDIX ...

Page 3: ... set is safe to operate without damage of electrical shock Leakage Current Cold Check Antenna Cold Check With the instrument AC plug removed from AC source connect an electrical jumper across the two AC plug prongs Place the AC switch in the on position connect one lead of ohm meter to the AC plug prongs tied together and touch other ohm meter lead in turn to each exposed metallic parts such as an...

Page 4: ...arge on your body by touching a known earth ground Alter natively obtain and wear a commercially available discharg ing wrist strap device which should be removed to prevent potential shock reasons prior to applying power to the unit under test 2 After removing an electrical assembly equipped with ES devices place the assembly on a conductive surface such as aluminum foil to prevent electrostatic ...

Page 5: ...nts of the two original leads If they are not shiny reheat them and if necessary apply additional solder Fuse and Conventional Resistor Removal Replacement 1 Clip each fuse or resistor lead at top of the circuit board hollow stake 2 Securely crimp the leads of replacement component around notch at stake top 3 Solder the connections CAUTION Maintain original spacing between the replaced component a...

Page 6: ...many Netherland Switzerland Hungary Austria Slovenia Bulgaria France Spain Belgium Luxemburg Greece Czech Turkey Morocco Ireland Latvia Estonia Lithuania Poland Portugal Romania Albania Bosnia Slovakia Belarus DTV MPEG2 4 DVB T2 11 countries UK Ireland Sweden Denmark Finland Norway Ukraine Kazakhstan Russia Italy Croatia Serbia DTV MPEG2 4 DVB C 37 countries Germany Netherland Switzerland Hungary ...

Page 7: ...t s 1 4 1 8 1 16 1 32 Modulation Code Rate QPSK 1 2 2 3 3 4 5 6 7 8 16 QAM 1 2 2 3 3 4 5 6 7 8 64 QAM 1 2 2 3 3 4 5 6 7 8 DVB T2 Guard Interval Bitrate_Mbit s 1 4 1 8 1 16 1 32 1 128 19 128 19 256 Modulation Code Rate QPSK 1 2 2 5 2 3 3 4 5 6 16 QAM 1 2 2 5 2 3 3 4 5 6 64 QAM 1 2 2 5 2 3 3 4 5 6 256 QAM 1 2 2 5 2 3 3 4 5 6 DVB C Symbolrate 4 0Msymbols s to 7 2Msymbols s Modulation 16QAM 64 QAM 128...

Page 8: ...080 33 75 60 00 74 250 HDTV 1080i 13 1920 1080 56 25 50 00 148 50 HDTV 1080p 14 1920 1080 67 43 59 94 148 350 HDTV 1080p 15 1920 1080 67 50 60 00 148 50 HDTV 1080p 5 1 2 HDMI Input PC No Resolution H freq kHz V freq Hz Pixel clock MHz Proposed Remarks 1 640 350 31 46 70 09 25 17 EGA 2 720 400 31 46 70 08 28 32 DOS 3 640 480 31 46 59 94 25 17 VESA VGA 4 800 600 37 87 60 31 40 00 VESA SVGA 5 1024 76...

Page 9: ...0P 17 1920 1080 33 71 29 97 79 12 HDTV 1080P 18 1920 1080 33 75 30 00 79 20 HDTV 1080P 19 1920 1080 56 25 50 00 148 50 HDTV 1080P 20 1920 1080 67 43 59 94 148 35 HDTV 1080P 21 1920 1080 67 50 60 00 148 50 HDTV 1080P 22 3840 2160 53 95 23 98 297 00 UDTV 2160P UHD only 23 3840 2160 54 00 24 00 297 00 UDTV 2160P UHD only 24 3840 2160 56 25 25 00 297 00 UDTV 2160P UHD only 25 3840 2160 61 43 29 97 297...

Page 10: ...vice purposes 5 2 3D Mode DTV HDMI USB 5 2 1 RF Input No Resolution H freq kHz V freq Hz Pixel clock MHz Proposed 3D input proposed mode 1 1280 720 37 50 50 74 25 HDTV 720P 2D to 3D Side by Side Top Bottom 2 1920 1080 28 13 50 74 25 HDTV 1080I 2D to 3D Side by Side Top Bottom ...

Page 11: ... move to About This TV page for update 5 TV is updating 6 After finished the update below Pop up appear 7 Click Yes TV will be DC OFF ON 8 After TV turned on Check the updated SW Version and Tool Option 2 NSU 1 Menu All Settings General About This TV 2 Click CHEK FOR UPDATES system check newest version 3 Click DOWNLOAD AND INSTALL 4 TV is updating 5 After finished the update below Pop up appear 6 ...

Page 12: ...X_TAL 32 768KHz I2C 1 USB_WIFI X_TAL 27MHz Sub Assy LAN ETHERNET SPDIF AV COMP CVBS YPbPr SPDIF OUT H P AMP RS 232 MAX323 MAIN Audio AMP DTA2010M I2S Out I2C 4 Vx1 51P 8 lane LGD 60 65 70 75 Vx1 EPI I2C 6 EPI PMIC SW50B3A Level shifter M0 M1 B CAS I2C 6 NVRAM 256Kb I2C 4 I2C 2 EPI block HDMI4 EEPROM K3L only K3Lp 256MB x 2ea SoC USB1 3 0 OCP K3L only IR KEY 1Key LOGO LIGHT Ready WIFI BT Combo MTK ...

Page 14: ...D SW5253 BOE CLK x10 VCOM1 VCOMLFB VCOMRFB VCOM2 VGL1 VST GIP_RST LS_VGL VGH_EVEN VGH_ODD HVDD EPI 3Lane 60P EPI 3Lane 60P HVDD HVDD GMA 1 5 6 9 10 13 24 18 GPIO_5_VBY_LOCK EPLOCK PMIC_RESET GPIO7_PMIC_RESET LOCKOUT12 GST E O MCLK GLCK GPIO019_DAC_OUT GPIO_0_DAC_SCLK GPIO_4_VBY_HTPD TCON_14 GPO_1_TCON_I2C_EN TCON_2 Boost Buck RT5043A VDD VCORE SWG SWO SWI EPI_TX12 EPI_TX23 GAMMA RT6508 BOE Only GM...

Page 15: ...IF_N TUNER_SIF OPT TU_EXT_ATV TU_CVBS OPT TU_EXT_ATV IF_AGC AE1 U2 IF_P AE2 U3 IF_N AE3 V2 SIF Y5 R5 VIN10P Y4 W4 GPIO55_RF_IF_AGC1 SCL_DEMOD 36 SDA_DEMOD 35 DEMOD_CORE LNB IC7001 DT1805 LNB_TX LNB_OUT 1 8K ȳ 5 SCL 6 SDA 8 TONECTRL 2 LNB 33 ȳ TU_RESET2_TU 34 TU_RESET2 AA3 M2 VINGP_DEMOD_RESET 33 ȳ 33 ȳ TU_JP AA5 Y4 GPIO52_TUNER0_SCL AA6 AA4 GPIO51_TUNER0_SDA S_ERROR 28 S_MCLK 33 S_SYNC 30 S_VAL 31...

Page 16: ..._SCL G5 H P AMP TPA6138A2 IC6300 LPF AI2L_AMP_RESET_N F5 SPDIF_OUT AV1_CVBS_DET COMP1 AV1 DVI_L_IN COMP1 AV1 DVI_R_IN H5 AIO1L_AV1_CVBS_DET M5 AI1L M4 AI1R HP_LOUT_AMP HP_ROUT_AMP LPF LPF Realtek K3Lp Tuner GPIO_6_SPDIF_OUT_0 E3 AUD_LRCH AUD_LRCK AMP_MUTE SPK_R R SPK_L L MAIN AMP DTA2010M IC5800 MICOM SPK L SPK R 22 26 38 CLK_I 8 WCK 7 SDATA 10 11 36 12 30 33 18 21 AV COMP HDMI2 SPDIF HP_DET AIO2L...

Page 17: ...DMI_1 ST_GPIO_14_H1_HPD ST_GPIO_17_H1_SCL ST_GPIO_16_H1_SDA ST_GPIO_23_H0_ARC P1_CKN P_RGB_N P DDC_SCL2 DDC_SDA2 HDMI2 0_2_5V_DET HDMI2 0_3_HPD TMDS3 D0 D1 D2 CLK ST_GPIO_10_5V_DET_HDMI_2 ST_GPIO_11_H2_HPD ST_GPIO_13_H2_SCL ST_GPIO_12_H2_SDA P2_CKN P_RGB_N P DDC_SCL3 DDC_SDA3 HDMI2 0_3_5V_DET HDMI2 0_4_HPD TMDS4 D0 D1 D2 CLK ST_GPIO_07_5V_DET_HDMI_3 ST_GPIO_06_H3_HPD ST_GPIO_09_H3_SCL ST_GPIO_08_H...

Page 18: ...ICOM R5F100GEAFB IC3000 AH5 ST_GPIO_02_VGA_SDA AG5 ST_GPIO_01_VGA_SCL ST_GPIO_25_UART0 1 AH13 ST_GPIO_24_UART0 1 AG14 Wafer P200 Wafer P4000 DEBUG UART Wafer P201 5 7 9 10 19 20 23 24 SOC_RX TX DCDC OCP BD2242G IC4501 USB_OCD2 AJ18 USB_CTL2 AG20 5V_USB2 0_2 5V_USB2 0_3 WOL WIFI_POWER_ON BT_RESET BT_WAKEUP_DEVICE BT_WAKEUP_HOST IR LED_R KEY2 KEY1 DCDC OCP BD2242G IC4700 USB_OCD3 AG22 USB_CTL3 AH19 ...

Page 19: ...GPIO_27_MICRO_SCL I2C_SDA_1 I2C_SCL_1 K3Lp GPIO_1_TCON_SDA TC ON_5 1 8k ȳ 3 3V_NOR 1 8k ȳ 1 8k ȳ 3 5V_ST R5F100GEAFB 30 MICOM AI3L_AMP_SCL AI2R_AMP_SDA I2C_SDA4 I2C_SCL4 FT24C256A ESR T NVRAM DTA2010M AMP GPIO_51_TUNER0_SDA GPIO_52_TUNER0_SCL I2C_SDA2 I2C_SCL2 DT1805 LNB TDJN G501D TUNER 1 8 k ȳ 1 8 k ȳ 3 3V_NOR 1 8k ȳ 1 8k ȳ 3 3V_NOR 33 ȳ 33 ȳ 33 ȳ 33 ȳ 100ȳ 33 ȳ EPI CEDS only 8 K3Lp I2C Map ...

Page 20: ...le control AIO2R_CMD_VCC_SC PCM_5V_CTL Panel GPIO_4_VBY_HTPD TCON_14 EPI_MCLK GPIO_5_VBY_LOCK EPLOCK LOCKAn GPIO7_PMIC_RESET PMIC_RESET PMIC GPO011_PWM_DIM_1 GPIO010_PWM_DIM_0 PWM_DIM2 POWER PWM_DIM GPO012_LD_SPI1_SCK L DIM_M0_SCLK GPO013_LD_SPI1_SDO L DIM_M0_MOSI GPO014_LD_SPI1_SYNC L DIM_M0_VS EPI_GCLK GPO_1_TCON_I2C_EN TCON_2 VINBN_VIDCORE VID_CORE CORE DCDC VINRP_TUNER0_REST TU_RESET1 Tuner TU...

Page 21: ...1 0V DCDC Eth STDBY IC2307 TLV62565DBVR EWBS_TUNER P16 TI01 TO01 INTP5 16 AM_MODE_DET_OLED P137 INTP0 43 HDMI EXT EDID IC3401 BR24G02FJ 22 P10 SCK00 SCL00 7 P74 KR4 INTP8 SI01 SDA01 19 P13 TXD2 SDA20 36 P140 PCLBUZ0 INTP6 IR KEY WIFI BT P4000 10 P71 KR1 SI21 SDA21 11 P70 KR0 SIK21 SCL21 31 P21 ANI1 AVREFM 32 P20 ANI0 AVREFP 38 P41 TI07 TO07 6 P75 KR5 INTP9 SCK01 SCL01 20 P12 SO00 TXD0 TOOLTXD 21 P...

Page 22: ...WEN DC1_WE K3L_DDR_0_DQS_0_P N K3L_DDR_0_DQS_1_P N DC1_DQS0 DQS0B DC1_DQS1 DQS1B DC1_DQS2 DQS2B DC1_DQS3 DQS3B K3L_DDR_0_DQ 0 15 K3L_DDR_0_DQ 16 31 DC1_DQ 0 15 DC1_CLK CLKB DC1_CKE A 0 14 BA 0 2 ODT RAS CAS WEN LDQS LDQS DDR3 IC400 CK CK CKE UDQS UDQS DC1_DQ 16 31 DQ 0 15 A 0 14 BA 0 2 ODT RAS CAS WEN DDR3 IC401 LDQS LDQS CK CK CKE UDQS UDQS DQ 0 15 K3L_DDR_0_DQS_2_P N K3L_DDR_0_DQS_3_P N 1k ohm D...

Page 23: ... SoC STB3V3_1 L311 FET Q203 SoC STB3V3_2 1V WOL 1A IC2307 SoC Ethernet FET Q202 L300 SoC USB1V0 L302 SoC LV1V0 L305 SoC HDRX1V0 1 5V DDR 3 5A IC2303 DDR3 IC401 DDR3 IC402 FET Q201 SoC LV1V5_1 2 L303 SoC CPU1V0 D1V0 10A IC2302 SoC C01V0 FET Q1101 SubPMIC IC9300 Panel_VCC L1100 SoC DDR L400 DDR VTT 0 75V 1 5A IC410 Tuner 3 5V_ST L6504 PMIC IC9200 12 K3Lp Power Block ...

Page 24: ...HDRX3V3 FET Q302 SoC D3V3 A3V3 L306 1 8V 2A IC2301 L2305 SoC EMMC1V8 EMMC VCCQ EMMC VCC L2304 Demod Core 2A IC6900 2 5V 2A IC6800 Tuner Demod Tuner 2 5V Audio Amp L5801 BCAS L6401 Tuner 3 3V_TU L6505 Tuner LNB L7001 Tuner 3 3V_TU L6503 5V NORM 4A IC2500 USB1 OCP USB2 OCP EDID EEPROM CI OCP CI IF L6400 BCAS Japan A13 2V Audio Amp Japan Only 13 K3Lp Power Block2 ...

Page 25: ...W Many electrical and mechanical parts in this chassis have special safety related characteristics These parts are identified by in the EXPLODED VIEW It is essential that these special safety parts should be replaced with the same components as recommended in this manual to prevent Shock Fire or other Hazards Do not modify the original design without permission of manufacturer IMPORTANT SAFETY NOT...

Page 26: ...l 4 2 2 2 2 3 1 3 2 2 2 3 3 3 3 3 4 2 Disassemble Back Cover When it is Latch decomposition as shown in the figure below and then decomposed by grasping the portions caution Hook can be separated on the top position don t pull it hard for upward Grip for disassembling B C Back Cover Bottom In case it disassemble hard you can use tool like a driver Insert driver into rectangle hole for disassemblin...

Page 27: ...G Electronics Inc All rights reserved Only training and service purposes 4 Separate connectors 6 from Main Power PCB and module Separate Speaker 7 2EA from module B B A 6 B B A 6 6 6 6 6 6 6 7 7 3 Detach the Tape 5 5 ...

Page 28: ...ll rights reserved Only training and service purposes 6 Detach the Insulation Sheet 10 10 5 Unlock screw 8 18EA to separate from module 1 pole Stand Supporter 9 2EA is applied on 1pole Stand type 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 9 9 ...

Page 29: ...training and service purposes 8 Separate connectors 16 from wifi PCB 18 Separate wifi PCB 18 from Wifi Bracket of Latch 17 16 17 18 7 Separate connectors 13 from IR PCB 12 Lift the latch 14 to the upside and push the button 15 for separation 12 11 13 14 14 15 ...

Page 30: ...Separate Stand body top 27 from Stand Base 28 27 28 9 Detach the foot rubber 22 7EA from 1pole Stand Assy 21 Unlock screw 22 12EA from 1pole Stand Assy 21 Separate Stand Pipe 25 and Metal Stand Neck 26 from 1pole Stand Assy 21 21 22 22 22 22 24 22 22 22 22 22 22 22 24 24 24 24 24 24 25 26 22 ...

Page 32: ...g power auto on off 7 8 8 C Audio error No audio Normal video 9 9 Wrecked audio discontinuation noise 10 10 D Function error Remote control Local switch checking 11 MR15 operating checking 12 11 12 Wifi operating checking 13 13 Camera operating checking 14 14 External device recognition error 15 15 E Noise Circuit noise mechanical noise 16 16 F Exterior error Exterior defect 17 First of all Check ...

Page 33: ...s End Always check record S W Version and White Balance value before replacing the Main Board Replace Main Board Re enter White Balance value Precaution Established date Standard Repair Process Revised date 1 17 Error symptom A Video error No video Normal audio A18 A1 A18 A4 A2 First of all Check whether all of cables between board is inserted properly or not Main B D Power B D LVDS Cable Speaker ...

Page 34: ...k and replace MAIN B D Y Replace Power Board and repair parts N End Standard Repair Process A Video error No video No audio A18 Established date Revised date 2 17 Error symptom 2 Copyright 2017 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 35: ...ain B D Check Tuner soldering Normal Picture Y N Y Close Y Close By using Digital signal level meter By using Diagnostics menu on OSD Advanced Channels Channel Tuning Manual Tuning Check the Signal Signal strength Normal over 50 Signal Quality Normal over 50 Normal Picture Y Contact with signal distributor or broadcaster Cable or Air N Normal Picture Y Close N A4 Standard Repair Process Establishe...

Page 36: ... Check external device and cable Y External device Cable normal HDMI error Check external device and cable Replace Main T con B D Replace Main T con B D N N A Video error Color error A6 N Y End Replace module Request repair for external device cable Color error Check Test pattern A8 A7 Standard Repair Process Established date Revised date 4 17 Error symptom 4 Copyright 2017 LG Electronics Inc All ...

Page 37: ...DVI by connecting Jig pattern Generator Set top Box etc N Y Replace Main T con B D Screen normal Check screen condition by input External Input Component HDMI DVI Request repair for external device Component error HDMI DVI Connect other external device and cable Check normal operation of External Input Component RGB and HDMI DVI by connecting Jig pattern Generator Set top Box etc Replace Main T co...

Page 38: ...e voltage of each output of Power B D N Y Normal voltage Replace Main B D Y OK Replace Main B D N Y Normal Check ST BY 3 5V Replace Power B D N Y Normal voltage Replace Power B D Y A17 A18 A18 A18 Standard Repair Process Established date Revised date 6 17 Error symptom 6 Stand By Red or Turn On Operating Turn Off Close Copyright 2017 LG Electronics Inc All rights reserved Only for training and ser...

Page 39: ...ce Main B D CPU Abnormal If Power Off mode is not displayed Check Power B D voltage Y N Replace Main B D Normal voltage Replace Power B D Replace Power B D N Y Normal End Caution Check and fix exterior of Power B D Part A19 A18 Established date Revised date 7 17 Error symptom Standard Repair Process 7 Abnormal 1 Copyright 2017 LG Electronics Inc All rights reserved Only for training and service pu...

Page 40: ...gh Check fail after multi power on Check Change Power B D CPUABNORMAL If the CPU attempts to reset in case of abnormal operation and Shut Down in case of failure Check Change Main B D NO POLING Power off when receiving no ack RESULT TV power off on Reboot CONDITION There is no I2C response from CPU for 15 seconds Check Change Main B D CPUCMD Power off by main SoC command Check Change Main B D INV_...

Page 41: ... Power Board and repair parts Check Speaker disconnection N Y Replace Speaker Replace MAIN Board End C Audio error No audio Normal video A20 A21 A18 Disconnection Established date Revised date 9 17 Error symptom Standard Repair Process 9 Copyright 2017 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 42: ...rnal Input Connect and check other external device N Y Normal audio Check and fix external device Replace Power B D N Y Normal voltage Check input signal RF External Input signal Signal normal When RF signal is not received Request repair to external cable ANT provider Y Check audio B Voltage 13V Replace Main B D In case of External Input signal error Check and fix external device Replace Main B D...

Page 43: ...heck Replace Baterry of R C Check Repair Cable connection Connector solder Normal operating Check B 3 5V On Main B D A22 Normal Voltage Close N N Check 3 5v on Power B D Replace Power B D or Replace Main B D Power B D don t have problem A18 Check IR Output signal Normal Signal N Y Repair Replace IR B D N A22 Replace Main B D Y A22 Standard Repair Process Established date Revised date 11 17 Error s...

Page 44: ...shed date Revised date 12 17 Error symptom Replace MR15 Turn off on the set and press the wheel Press the back key about 5sec Close If you conduct the loop at 3times change the MR15 Y Check the INSTART menu RF Receiver ver is 00 00 Y Check Repair RF assy connection N Down load the Firmware INSTART MENU 14 RF Remocon Test 3 Firmware download Y RF Receiver ver is 00 00 N Close A23 A4 A4 12 Copyright...

Page 45: ...ifi cable connection N Check the Wifi wafer 1pin Standard Repair Process Established date Revised date 13 17 Error symptom 13 Change the Wifi assy Normal Voltage Close Y Y N Replace Main B D Wi Fi Mac value is NG N Close A24 A4 A4 A24 Copyright 2017 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 46: ...mera Ver is NULL Y N Reconnect the Camera module Standard Repair Process Established date Revised date 14 17 Error symptom 14 Change the Camera module Normal operation Close Y N Replace Main B D A25 A4 Copyright 2017 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 47: ...eck and fix external device cable HDMI DVI Optical Recognition error Replace Main B D Replace Main B D Fix in accordance with technical information D Function error External device recognition error Established date Revised date 15 17 Error symptom Standard Repair Process 15 Copyright 2017 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 48: ...s shown in the solution manual For models without any fix information provide the description OR Mechanical noise is a natural phenomenon and apply the 1st level description When the customer does not agree apply the process by stage Describe the basis of the description in Part related to nose in the Owner s Manual E Noise Circuit noise mechanical noise Established date Revised date 16 17 Error s...

Page 49: ...e cabinet Replace remote control Remote control damage Stand dent Replace stand F Exterior defect Exterior defect Established date Revised date 17 17 Error symptom Standard Repair Process 17 Copyright 2017 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 50: ...Checking Part A5 6 A Video error _Vertical Horizontal bar residual image light spot Connection diagram A6 7 A Video error_ Color error Check Link Cable EPI reconnection condition A7 8 Appendix Defected Type caused by T Con Inverter Module Check Cable 1 2 A 1 11 A 2 11 9 Exchange Main Board 1 3 A 3 11 A 5 11 10 Exchange Module 1 3 A 6 11 A 8 11 11 Exchange T Con 1 2 A 9 11 A 10 11 12 Exchange Power...

Page 51: ...video Checking method in menu when there is no audio A20 17 Voltage and speaker checking method when there is no audio A21 18 D Function error Remote control operation checking method A22 19 E Etc How to use the Service remote control A23 A25 20 Check items after Main B D replacement A26 21 Adjustment Test pattern ADJ Key A27 22 How to use JIG Power B D Diganostic Smart Jig Multi Gender A28 Contin...

Page 52: ...nt Check LCD back light with naked eye A Video error_No video Normal audio After turning on the power and disassembling the case check with the naked eye whether you can see light from locations A1 ALL MODELS Copyright 2017 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 53: ...rmal audio A2 Entry method 1 Press the ADJ button on the remote controller for adjustment 2 Enter into White Balance of item 13 3 After recording the R G B GAIN Cut value of Color Temp Cool Medium Warm re enter the value after replacing the MAIN BOARD ALL MODELS Copyright 2017 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 54: ...20dB etc Standard Repair Process Detail Technical Manual TUNER input signal strength checking method A Video error_Video error video lag stop ALL MODELS A3 Established date Revised date Error symptom Content A3 Copyright 2017 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 55: ... video lag stop 1 Checking method for remote control for adjustment Press the IN START with the remote control for adjustment Version ALL MODELS A4 Established date Revised date Error symptom Content A4 v v Copyright 2017 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 56: ...ce the MAIN BOARD 3 If you can t see the UHD live TV please connect signal at left side of jack Korea model only Standard Repair Process Detail Technical Manual TUNER checking part A Video error_Video error video lag stop ALL MODELS A5 Established date Revised date Error symptom Content A5 Copyright 2017 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 57: ...ical Horizontal bar residual image light spot As the part connecting to the external input check the screen condition by signal A6 Established date Revised date Error symptom Content A6 ALL MODELS Copyright 2017 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 58: ...ion condition A Video error_Color error Check the contact condition of the Link Cable especially dust or mis insertion A7 Established date Revised date Error symptom Content A7 ALL MODELS Copyright 2017 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 59: ...f FFC cable CABLE R Color Excessive Color is Excessive due to FFC Cable Contact CABLE Screen darkness screen is dark due to poor contact due to disconnection of the FFC cable pin CABLE G Color Excessive G color transient due to poor FFC cable connection Pin 단선 Copyright 2017 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 60: ...ead LVDS cable connection problem CABLE Color spread LVDS cable connection problem CABLE Screen stop Due to foreign substance withi nLVDS cable PIN Appendix Examples of Symptoms Image error Check for poor cable contact Copyright 2017 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 61: ...Main Screen noise Broken screen due to Main IC problem Main Dark picture Dark left side screen Main Broken picture Top bottom screen part Picture problem due to tuner Inner side quality problem Appendix Examples of Symptoms Main Copyright 2017 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 62: ...anner Main Screen spread Screen corner appears blurry Main Color Spread Color spread on the screen Main Blurry Screen Blurry picture on the screen Check parts by symptom Appendix Examples of Symptoms Main Copyright 2017 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 63: ...n problem Right side screen problem Main LG logo Screen problem Screen picture spread problem Main Right side picture problem No problem at the initial stage During Heat run right side picture problem Check parts by symptom Appendix Examples of Symptoms Main Copyright 2017 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 64: ...the screen MODULE Internal matter BLU internal foreign matter inflow MODULE Image broken 6 block image broken MODULE Image broken Screen sync signal broken A 6 11 Check parts by symptom Appendix Examples of Symptoms Module Copyright 2017 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 65: ...ng due to lateral external impact and internal bending of BLU MODULE Vertical smear Vertical spreading on cube screen in no signal MODULE Over color Screen contour part brightly Over color A 7 11 Check parts by symptom Appendix Examples of Symptoms Module Copyright 2017 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 66: ...nter of the screen 1 block dark MODULE Vertical bar Center Vertical Bar MODULE Darkness at the bottom of the screen MODULE internal BLU breakage A 8 11 Check parts by symptom Appendix Examples of Symptoms Module Copyright 2017 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 67: ...d the picture below the screen is broken T CON screen lower image broken T Con is defective and the picture below the screen is broken T CON screen lower image broken T Con is defective and the picture below the screen is broken A 9 11 Check parts by symptom Appendix Examples of Symptoms T Con Copyright 2017 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 68: ...f the screen Initial normal operation upper darkness during heat run T CON Image Broken The entire screen is dark and bit noise occurs T CON Image Broken The entire screen is dark and bit noise occurs A 10 11 Check parts by symptom Appendix Examples of Symptoms T Con Copyright 2017 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 70: ...Technical Manual Check front Power Indicator B Power error _No power A17 Established date Revised date Error symptom Content A17 ALL MODELS Copyright 2017 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 71: ...ard Voltage Symbol Values Unit Min Typ Max 65UJ65 VF 117 18 130 2 143 22 Vdc 60UJ65 111 87 124 3 136 73 55UJ65 99 4 106 6 113 8 49UJ65 85 05 91 8 43UJ65 65 94 71 4 Backlight Forward Voltage Symbol Values Unit Min Typ Max 65UJ63 VF 192 216 Vdc 60UJ63 175 195 55UJ63 130 4 141 2 49UJ63 111 6 118 8 43UJ63 65 94 71 4 Copyright 2017 LG Electronics Inc All rights reserved Only for training and service pu...

Page 72: ...justment item 3 Standard Repair Process Detail Technical Manual POWER OFF MODE checking method B Power error _Off when on off whiling viewing ALL MODELS A19 Established date Revised date Error symptom Content A19 Copyright 2017 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 73: ...und Out 4 Select TV Speaker Standard Repair Process Detail Technical Manual Checking method in menu when there is no audio C Audio error_No audio Normal video ALL MODELS A20 Established date Revised date Error symptom Content A20 Copyright 2017 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 74: ...rmal Standard Repair Process Detail Technical Manual Voltage and speaker checking method when there is no audio C Audio error_No audio Normal video A21 Established date Revised date Error symptom Content A21 1 DRV_ON 2 PDIM1 3 GND 4 GND 5 A13 6 A13 7 D13 8 D13 9 GND 10 D13 11 PWR_ON 12 PDIM2 1 SPK_R 2 SPK_R 3 SPK_L 4 SPK_L ALL MODELS 1 VSYNC 2 SIN 3 GND 4 SCLK 5 DRV_ON 6 PDIM1 7 GND 8 GND 9 A13 10...

Page 75: ... control operation checking method D Function error A22 Established date Revised date Error symptom Content A22 1 3 5V 2 WIFI_DM 3 WIFI_DP 4 GND 5 WOL_ON 6 3 5V 7 COMBO_RESET 8 GND 9 COMBO_WAKEUP_DEVICE 10 COMBO_WAKEUP_HOST 11 GND 12 GND 13 NC 14 NC 15 NC 16 EYE_SDA 17 EYE_SCL 18 GND 19 IR 20 LED 21 GND 22 3 5V 23 KEY2 24 KEY1 25 GND Checking order to check remote control IR LOGO light Rear IR Eye...

Page 76: ... board 2 Check the 3 5V on the terminal 1 Checking order to check motion remote wifi Wifi BT Front Wifi BT Rear ALL MODELS 1 3 5V 2 WIFI_DM 3 WIFI_DP 4 GND 5 WOL_ON 6 3 5V 7 COMBO_RESET 8 GND 9 COMBO_WAKEUP_DEVICE 10 COMBO_WAKEUP_HOST 11 GND 12 GND 13 NC 14 NC 15 NC 16 EYE_SDA 17 EYE_SCL 18 GND 19 IR 20 LED 21 GND 22 3 5V 23 KEY2 24 KEY1 25 GND Copyright 2017 LG Electronics Inc All rights reserved...

Page 77: ...to use the Service remote control D Function error A23 Established date Revised date Error symptom Content A23 0 4 1 3 0 4 1 3 1 How to access the remote control Copyright 2017 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 78: ...Cinema Zoom Aucto Screen 4 3 16 9 PSM Changes in the order of Bright Picture Easy Picture Cinema Spots Game Custom PIcture1 Custom Picture2 Bright Picture SSM Added Function Standard user music cinema sports game standard user PIP Picture In Picture is activated TEXT Access to the Power Only mode CAP Broadcasting caption on off MPX Stereo mode mono stereo foreign language access Used when in facto...

Page 79: ...attern Off White Red Green Blue Black Pattern Off Change X STUDIO Added function HDD USB external device s HDD screen is activated MENU User function gets activated EXIT Exit from the current mode TIME SHIFT Added function Moves forward backward of recorded contents MUTE Mute function 0 Volume IN STOP SET to factory mode VOL Volume Up Down CH Channel Up Down AV1 2 3 Added function Connects to exte...

Page 80: ...ber D L Key in the model name and serial number after checking the ID label on the back cover 1 Press the Service remote control instart Key 2 Press the Service remote control ADJ Key No 13 Select White Balance Record the R G B GAIN Cut value of the color temperature before main board replacement After replacing the main board key in the recorded value Copyright 2017 LG Electronics Inc All rights ...

Page 81: ...n view 11 types of patterns using the CH or key Checking item 1 Defective pixel 2 Residual image 3 MODULE error ADD BAR SCAN BAR 4 Video error Classification of MODULE or Main B D A27 Established date Revised date Error symptom Content A27 1 2 3 Copyright 2017 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 83: ...LH LJ 16Y UH 17Y SJ UJ 28Pin 24Pin 18Pin 24Pin 24Pin 24Pin 28Pin 28Pin 18Pin 28Pin 28Pin 12Pin 12Pin 28Pin 12 13 14Y Smart JIG connector applied 24Pin 24Pin NC Includes 49UJ63 Defect diagnosis Power Board Main Board 16Y OLED 17Y OLED A 28 2 19 Copyright 2017 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 84: ...H66 LH60 LH54 17 OLED B7 C7 E7 G7 W7 17 LED SJ95 UJ98 SJ85 UJ94 SJ80 UJ77 UJ75 UJ78 UJ65 UJ68 UJ63 UJ67 LJ61 LJ68 LJ55 LJ58 15Y 16Y 17Y OLED Model 16Y 17Y LED Model Existing 12Y 13Y 14Y 15Y LED models included 15Y 16Y 17Y OLED 16 17 Y LED model Power diagnosis function newly added A 28 3 19 Copyright 2017 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 85: ... POWER A 2013 Power Board Muitl Gender How to Connect Connect the Muiti Gender to the connector black as shown in picture 2 of the Smart JIG A 28 4 19 Copyright 2017 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 86: ...is can be made only if it is set correctly 24V Power Board Change the switch to 24V of Smart Jig Voltage 20V Power Board Change the switch to 24V of Smart Jig Voltage 13 2V 18V Power Board Change the switch to 24V of Smart Jig Voltage Power B D Smart Jig Voltage Switch 24V 24V 20V 20V 13 2V 18V 24V A 28 5 19 Copyright 2017 LG Electronics Inc All rights reserved Only for training and service purpos...

Page 87: ...r Cable connector to the Muitl Gender JIG 24Pin connector 3 1 2 Check power board voltage Switch the product S W in JIG to LCD LCD MODEL Check the power voltage and switch 24V to the correct voltage Fix the LCD MODEL switch to 24V Smart JIG 4 A 28 6 19 Copyright 2017 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 88: ...Diagnostic method 2 5 6 When the OK LED 24V 12V turns on Power Board is normal When the NG LED turns on the Power Board can be judged as defective A 28 7 19 Copyright 2017 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 89: ... Switch the LCD MODEL S W to 24V by checking the power voltage Fix the LCD MODEL switch to 24V Smart JIG When the OK LED 24V 12V turns on Power Board is normal When the NG LED turns on the Power Board can be judged as defective A 28 8 19 Copyright 2017 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 90: ...ch to 24V Smart JIG Disconnect the Main Board 24Pin Power Cable connector Connect the 24Pin Power Cable connector to the Muitl Gender JIG 24Pin connector When the OK LED 24V 12V turns on Power Board is normal A 28 9 19 Copyright 2017 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 91: ...Board 24Pin Power Cable connector Connect the 24Pin Power Cable connector to the Muitl Gender JIG 24Pin connector When the OK LED 24V 12V turns on Power Board is normal When the NG LED turns on the Power Board can be judged as defective A 28 10 19 Copyright 2017 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 92: ...Board 24Pin Power Cable connector Connect the 24Pin Power Cable connector to the Muitl Gender JIG 24Pin connector When the OK LED 24V 12V turns on Power Board is normal When the NG LED turns on the Power Board can be judged as defective A 28 11 19 Copyright 2017 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 93: ...Muitl Gender JIG 28Pin connector Switch the LCD MODEL S W to 20V by checking the power voltage Fix the LCD MODEL switch to 20V Smart JIG When the OK LED 24V 12V turns on Power Board is normal When the NG LED turns on the Power Board can be judged as defective A 28 12 19 Copyright 2017 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 94: ... Gender JIG 28Pin connector Switch the LCD MODEL S W to 20V by checking the power voltage Fix the LCD MODEL switch to 20V Smart JIG When the OK LED 24V 12V turns on Power Board is normal When the NG LED turns on the Power Board can be judged as defective A 28 13 19 Copyright 2017 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 95: ...in Board 18Pin Power Cable connector Connect the 18Pin Power Cable connector to the Muitl Gender JIG 24Pin connector When the OK LED 24V 12V turns on Power Board is normal When the NG LED turns on the Power Board can be judged as defective A 28 14 19 Copyright 2017 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 96: ...in Board 28Pin Power Cable connector Connect the 28Pin Power Cable connector to the Muitl Gender JIG 28Pin connector When the OK 24V 12V LED turns on Power Board is normal When the NG LED turns on the Power Board can be judged as defective A 28 15 19 Copyright 2017 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 97: ...Main Board 28Pin Power Cable connector Connect the 28Pin Power Cable connector to the Muitl Gender JIG 28Pin connector When the OK LED 24V 12V turns on Power Board is normal When the NG LED turns on the Power Board can be judged as defective A 28 16 19 Copyright 2017 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 98: ...in Board 12Pin Power Cable connector Connect the 12Pin Power Cable connector to the Muitl Gender JIG 12Pin connector When the OK LED 24V 12V turns on Power Board is normal When the NG LED turns on the Power Board can be judged as defective A 28 17 19 Copyright 2017 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 99: ... Board 12Pin Power Cable connector Connect the 12Pin Power Cable connector to the Muitl Gender JIG 24Pin connector When the OK LED 24V 12V turns on Power Board is normal When the NG LED turns on the Power Board can be judged as defective A 28 18 19 Copyright 2017 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 100: ... Board 28Pin Power Cable connector Connect the 28Pin Power Cable connector to the Muitl Gender JIG 28Pin connector When the OK LED 24V 12V turns on Power Board is normal When the NG LED turns on the Power Board can be judged as defective A 28 19 19 Copyright 2017 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 101: ......

Search results

Summary of Contents for 55UJ634V

Reviews:

LG 55UJ634V, Service Manual, Page: 58 / 101

Search results

Summary of Contents for 55UJ634V

Reviews: