LG 43UJ750 -ZB Series Service Manual Download Page 85

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`16Y OLED(G6) Power Board Diagnostic method

▶

Check power board voltage.

▶

Fix the LCD MODEL switch 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.

▶

When the NG LED turns on, the Power Board

can be judged as defective.

A 28 (11/19)

Only for training and service purposes.

Summary of Contents for 43UJ750 -ZB Series

Page 1: ...S UD71P MODEL 43UJ750 43UJ750 ZB CAUTION BEFORE SERVICING THE CHASSIS READ THE SAFETY PRECAUTIONS IN THIS MANUAL LED TV SERVICE MANUAL Copyright 2017 LG Electronics Inc All rights reserved Only training and service purposes CONFIDENTIAL ...

Page 2: ...ghts reserved Only for training and service purposes CONTENTS CONTENTS 2 SAFETY PRECAUTIONS 3 SERVICING PRECAUTIONS 4 SPECIFICATION 6 SOFTWARE UPDATE 10 BLOCK DIAGRAM 11 EXPLODED VIEW 19 DISASSEMBLY GUIDE 20 TROUBLE SHOOTING GUIDE APPENDIX ...

Page 3: ...he 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 ...

Page 4: ...charge 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 electrostati...

Page 5: ...oints 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...

Page 6: ...ia 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 Austria Slovenia Bulgaria France Spain Italy Belgium Russia Luxemburg Greece Czech Croa tia Turkey Morocco Ireland Latvia Estonia Lit...

Page 7: ...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 Model L V Z T2 only Model 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 QAM and 256 QAM DVB S S2 ...

Page 8: ...00 24 000 63 36 HDTV 1080P 17 1920 1080 33 71 29 97 79 120 UDTV 2160P 18 1920 1080 33 75 30 00 79 20 UDTV 2160P 19 1920 1080 56 25 50 00 148 50 UDTV 2160P 20 1920 1080 67 432 59 94 148 350 UDTV 2160P 21 1920 1080 67 50 60 00 148 50 UDTV 2160P 22 1920 1080 135 00 120 00 297 00 UDTV 2160P DVB 23 1920 1080 135 00 119 88 296 703 UDTV 2160P 24 1920 1080 112 5 100 00 297 00 UDTV 2160P 25 3840 2160 53 95...

Page 9: ...on 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 768 48 36 60 00 65 00 VESA XGA 6 1360 768 47 71 60 01 84 75 VESA WXGA 7 1152 864 54 34 60 05 80 00 VESA 8 1280 1024 63 98 60 02 109 00 SXGA Support to HDMI PC 9 1920 1080 67 50 60 00 158 40 WUXGA R...

Page 10: ...ow 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 ...

Page 11: ... HDMI2 2 0 HDMI3 2 0 SYSTEM EEPROM 256Kb USB2 2 0 USB3 2 0 eMMC 4GB Sub Micom RENESAS R5F1000G DDR3 2133 X 16 512MB X 2EA X_TAL 24MHz I2S Out H P AV R E A R S I D E R E A R H HP AMP SPDIF OUT BLUTOOTH IR KEY EYE WIFI SUB ASSY IR KEY Tuner I2C 5 I2C CVBS SIF COMP ARC X_TAL 32 768kHz OCP 1 5A OCP 1 5A Component Spec Out in North America HDMI4 2 0 Tuner H NIM BLOCK DIAGRAM 1 SOC Block Diagram ...

Page 12: ...es M16 AN31 DMD_ADC_INP AN32 DMD_ADC_INN TDJN G501D 3 3V_LNA_TU 3 3 3V_TUNER I2C_SCL5_TU 1 I2C_SDA5_TU 2 IF_AGC_TU 5 FILTER IF_P IF_N IF_AGC ADC_I_INP ADC_I_INN I2C_SCL5 I2C_SDA5 AH25 SCL5 AH26 SDA5 AL24 CVBS_IN1 AL31 IF_AGC IF_P 7 IF_N 8 3 3V_TUNER 1 2Kȳ ICVBS 4 3 3V_TUNER TR 33 ȳ 2 Tuner ...

Page 13: ...MP2_Pr_IN_SOC JACK AV A A 1 ACK Jack Side SOC Side SPDIF_OUT SPDIF OUT H P JACK HP_LOUT_JACK HP_ROUT_JACK AM14 IEC958OUT AL15 AUDA_OUTL AM15 AUDA_OUTR SPDIF_OUT_ARC PHY0_ARC_OUT COMP2 AV_L_IN COMP2 AV_R_IN AL18 AUAD_L_CH2_IN AM18 AUAD_R_CH2_IN AUAD_L_CH2_IN AUAD_R_CH2_IN HP AMP TPA6138 ARC OUT HDMI2 Front Speaker MICOM AMP_RESET SCK LRCK DACLRCH I2C_SCL_0 SDA_0 I2S GPIO23 Audio AMP NTP7515 Compone...

Page 14: ...F_OUT_ARC HDMI_HPD_2 CEC_REMOTE Port_1 DDC_I2C_1 HDMI_HPD_1 HDMI2 0 LGE PHY HDCP1 4 HDCP2 2 HDCP1 4 HDCP 2 2 HDMI2 0 LGE PHY HDMI2 0 LGE PHY 5V 5V 5V HDMI 4 2 0 _H HDCP1 4 HDCP2 2 HDMI 3 2 0 _H CEC_REMOTE Port_3 DDC_I2C_3 SPDIF_OUT_ARC HDMI_HPD_3 HDMI2 0 LGE PHY 5V HDMI2_3_HPD HDMI2_3_SDA HDMI2_3_SCL HDMI2_2_HPD HDMI2_2_SDA HDMI2_2_SCL HDMI2_1_HPD HDMI2_1_SDA HDMI2_1_SCL HDMI2_0_HPD HDMI2_0_SDA HD...

Page 15: ...ON USB2_2_DP0 DM0 SOC_RX TX USB3_0_DP0 DM0 USB3_0_RX0_P M USB2_1_DP0 DM0 USB2 0_2_DP1 DM1 USB2 0_3_DP0 DM0 USB2_0_DP0 DM0 UART1_RXD TXD Debug Wafer P202 UART1_RX TX JK6200 RS232C phone Jack SOC_RX TX UART wafer P3401 P3402 SOC_RX TX US model only USB 1 3 0 _V USB 2 2 0 _H USB 3 2 0 _H WIFI_EN 3 5V_WIFI OCP BD224G GPIO90 USB_CTL1 5V_USB_1 OCP BD224G GPIO95 USB_CTL2 5V_USB_2 OCP BD224G GPIO34 USB_CT...

Page 16: ...UJ75 Main 13 2V 3 3V Normal 3A 0 9V_CPU DC DC 3A 1 8V IO DC DC 3A 1 5V DDR DC DC 3 5A 0 9V_CORE DC DC 10A Tuner_2 5V 2A ETH 3 5V ST BY 4A Japan option 5V Normal 6A WIFI Panel_VCC LNB MICOM IR ETC SOC M16P 1 2V DEMOD LDO 2A 0 9V DDR C4TX LDO 1 5A EPI_C4TX_1 2V LDO 2A AUDIO AMP IC FRONT 6 Power Block ...

Page 17: ... EYE XWW ZUZr EYE_I2C_SDA EYE_I2C_SCL 3 5V_ST 33pF Cap Ready 0x56 0x52 0xC A 0x10 0xA0 Device addres s I2C_SCL4 AJ21 SCL4 I2C_SDA4 AH21 SDA4 I2C_SCL1 AK22 SCL1 I2C_SDA1 AJ22 SDA1 I2C_SCL3 AH24 SCL3 I2C_SDA3 AJ24 SDA3 I2C_SCL0 AK23 SCL0 I2C_SDA0 AJ23 SDA0 I2C_SCL2 AH23 SCL2 I2C_SDA2 AH22 SDA2 I2C_SCL5 AH25 SCL5 I2C_SDA5 AH26 SDA5 Tuner XUYr GOl P 3 3V_TU ZZ 47pF 3 3V_NORMAL ZUZr Module P7601 Vx1 ˀ ...

Page 18: ...Hz 1 n TE GPU 480MHz 648MHz CTOP_GFx_R10 19 ck_mux_pll_sel_m1 0 DDR_M0PLL 1 DDR_M1PLL CTOP_GFx_R10 9 8 ck_mux_pll_sel_esm 0 CORE_PLL 1 CODEC_PLL 2 DDR_M1PLL CTOP_GFx_R10 17 16 ck_mux_pll_sel_lbus 0 CORE_PLL 1 CODEC_PLL 2 DDR_M1PLL 27 26 ck_mux_pll_sel_dco 0 CODEC_PLL 1 CORE_PLL 2 DDR_M1PLL CTOP_GFx_R16 17 18 CTOP_GFx_R00 01 02 CTOP_DPE_R28 29 30 CTOP_GFx_R06 07 08 CTOP_GFx_R10 31 30 ck_mux_pll_sel...

Page 19: ...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 NOTICE ...

Page 20: ... 20 Copyright LG Electronics Inc All rights reserved Only for training and service purposes DISASSEMBLY GUIDE 1 After Screw Disassemble please remove B C from Module Screw 14 ea 2 Detach Tape ...

Page 21: ...tronics Inc All rights reserved Only for training and service purposes 3 Remove all sort of cable 4 IR assy WiFi PCB assy disassembly 3 Disassemble screw 1ea and Remove wi fi cable Remove IR cable and Disassemble Latch 1ea ...

Page 25: ...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 26: ...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 27: ...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 28: ...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 29: ... 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 30: ...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 31: ...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 32: ...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 33: ...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 34: ... 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 35: ...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 36: ...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 37: ...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 38: ...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 39: ...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 40: ...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 41: ...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 42: ...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 43: ...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 44: ...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 45: ...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 46: ...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 47: ...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 48: ... 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 49: ...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 50: ...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 51: ...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 52: ...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 53: ...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 54: ...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 55: ...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 56: ...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 57: ...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 58: ...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 59: ...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 60: ...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 61: ...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 63: ...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 64: ...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 65: ...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 66: ...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 67: ...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 68: ... 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 69: ... 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 70: ...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 71: ...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 72: ...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 73: ...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 74: ...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 76: ...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 77: ...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 78: ... 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 79: ...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 80: ...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 81: ...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 82: ... 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 83: ...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 84: ...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 85: ...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 86: ...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 87: ... 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 88: ...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 89: ...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 90: ...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 91: ...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 92: ... 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 93: ... 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 ...

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LG 43UJ750 -ZB Series, Service Manual, Page: 85 / 94

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