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D. Function error

WIFI operating checking

3.Wifi operating error

Check the

INSTART menu

Wi-Fi MAC value

is “NG”?

Y

Check & Repair

Wifi cable

connection

N

Check the Wifi wafer

Standard Repair Process

Established

date

Revised date

9/11

9

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

Error symptom

Copyright

ⓒ

2020 LG Electronics Inc. All rights reserved.

Only training and service purposes.

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Summary of Contents for 75UH5F

Page 1: ...mission of this Service Manual is STRICTLY PROHIBITED unless you have obtained the prior written consent of the LG Electronics entity from which you received this Service Manual The material covered by this prohibition includes without limitation any text graphics or logos in this Service Manual Copyright 2020 LG Electronics Inc All rights reserved Only training and service purposes P NO MFL715003...

Page 2: ...ronics Inc All rights reserved Only training and service purposes CONTENTS CONTENTS 2 PRECAUTION 3 SERVICING PRECAUTIONS 5 SPECIFICATION 7 SOFTWARE UPDATE 10 BLOCK DIAGRAM 11 EXPLODED VIEW 12 TROUBLE SHOOTING GUIDE APPENDIX ...

Page 3: ...e electronic circuit C MOS Make certain that treatment person s body are grounded through wrist band Do not leave the module in high temperature and in areas of high humidity for a long time The module not be exposed to the direct sunlight Avoid contact with water as it may a short circuit within the module If the surface of panel become dirty please wipe it off with a softmaterial Cleaning with a...

Page 4: ... ved fejlagtig håndtering Udskiftning må kun ske med batteri af samme fabrikat og type Levér det brugte batteri tilbage til leverandøren ATTENTION II y a danger d explosion s il y a remplacement incorrect de la batterie Remplacer uniquement avec une batterie du même type ou d un type équivalent recommandé par le constructeur Mettre au rebut les batteries usagées conformément aux instructions du fa...

Page 5: ...by touching a known earth ground Alternatively obtain and wear a commercially available discharging 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 charge buildup or ex...

Page 6: ...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 7: ...each parts are followed each drawing and specification by part number in accord ance with BOM 5 The receiver must be operated for about 20 minutes prior to the adjustment 3 General Specification No Item Specification Remarks 1 Supported Sync Type Separate Sync Digital 2 Operating Frequency Digital Horizontal 30 83 kHz Ultra Deep Color Off 3G All Inputs 30 136 kHz Ultra Deep Color On 6G HDMI1 2 DP ...

Page 8: ...60 30Hz 4K 30Hz Supporting color format 8bits RGB444 USB O 2 EMF For SVC Download USB2 0 Device Memory stick Mouse Audio In O PC DVI Audio In L R Stereo 3P 3 5mm Phone Jack 2 Output DP O SST Single Stream Support HDMI1 4b Up to 340MHz Speaker Out X BTL Stereo L R 6 ohm Max 10W Internal Speaker Audio Out O SE Stereo L R 0 5Vrms 3P 3 5mm Phone Jack 3 External Control RS232C IN OUT O UART Comm w IR D...

Page 9: ...76 280 1680 x 1050 O V Lines 59 954 1089 1050 3 6 30 6 H Pixels 148 5 67 5 2200 1920 88 44 88 1920 x 1080 O V Lines 60 1125 1080 4 5 46 7 H Pixels 297 67 5 4400 3840 176 88 296 3840 x 2160 HDMI1 2 3 DP OPS V Lines 30 2250 2160 8 10 72 8 H Pixels 594 135 4400 3840 176 88 296 3840 x 2160 HDMI1 2 DP V Lines 60 2250 2160 8 10 72 No H freq kHz V freq Hz Remarks Resolution Support 1 31 5 60 EDTV 480p 48...

Page 10: ...ge Copying files from memory 4 Updating is starting 5 Updating Completed The Set will restart automatically 6 If your SET is turned on check your updated version and Tool option explain the Tool option next stage If downloading version is more high than your SET have SET can lost all channel data In this case you have to channel recover if all channel data is cleared you didn t have a DTV ATV test...

Page 11: ... Wafer 51P Wafer 41P 4Gb DDR4 4 16Gb 2GB VBY1 16 LANE eMMC M0 M1 I2C I2C PHY I2C I2S DAC USB 2 0 USB 3 0 8GB R x 3 R x 2 R x 1 OP AMP D P_Rx0 A UDIO IN Load Switch 전류센서 VCC 3 840 x 2 160 120P A udio In D P OUT TX DP I2C 8Key RTC EEPROM 32Kb Demux H DMI3 A B B A OPS A UDIO Audio In 4분할 MAX 3232 RS 232C IN RS 232C OUT R1IN ROUT1 DOUT 1 DIN 1 R2IN DOUT 2 DIN 2 ROUT 2 M1 M4 M4 M1 SN74LV UART_TX UART_R...

Page 12: ...EW 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 NO...

Page 13: ...TROUBLE SHOOTING GUIDE Copyright ⓒ 2020 LG Electronics Inc All rights reserved Only training and service purposes ...

Page 14: ...ror 4 5 B Power error No power 5 6 Off when on off while viewing power auto on off 6 7 C Function error Remote control Local switch checking 7 8 External device recognition error 8 9 WIFI operating checking 9 10 D Noise Circuit noise mechanical noise 10 11 E Exterior error Exterior defect 11 First of all Check whether there is SVC Bulletin in GSCS System for these model Copyright ⓒ 2020 LG Electro...

Page 15: ...er Board or parts 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 11 A Video error No video Normal audio A12 A1 A12 A3 A2 First of all Check whether all of cables between board is inserted properly or not Main B D Power B D Vx1 Cable Speaker...

Page 16: ... audio Check and replace MAIN B D Y Replace Power Board and repair parts N End Standard Repair Process A Video error No video No audio A12 Established date Revised date 2 11 2 Error symptom Copyright ⓒ 2020 LG Electronics Inc All rights reserved Only training and service purposes ...

Page 17: ...r Check external device and cable Y External device Cable normal HDMI DVI D DP error Check external device and cable Replace Main B D Replace Main B D N N A Video error Color error A4 N Y End Replace module Request repair for external device cable Color error Check Test pattern A6 A5 Standard Repair Process Established date Revised date 3 11 3 Error symptom Copyright ⓒ 2020 LG Electronics Inc All ...

Page 18: ...MI DVI by connecting Jig pattern Generator Set top Box etc N Y Replace Main B D Screen normal Check screen condition by input External Input Diplay Port DVI D HDMI DVI Request repair for external device Component error HDMI DVI D Diplay Port 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 et...

Page 19: ...gh Replace Power B D Measure voltage of each output of Power B D N Y Normal voltage Replace Main B D Y OK Replace Main B D Replace Power B D A12 A12 Standard Repair Process Established date Revised date 5 11 5 Error symptom Copyright ⓒ 2020 LG Electronics Inc All rights reserved Only training and service purposes ...

Page 20: ...by REMOTE CONTROL POWEROFF_OFFTIMER Power off by OFF TIMER POWEROFF_SLEEPTIMER Power off by SLEEP TIMER POWEROFF_INSTOP Power off by INSTOP KEY POWEROFF_AUTOOFF Power off by AUTO OFF POWEROFF_ONTIMER Power off by ON TIMER POWEROFF_RS232C Power off by RS232C POWEROFF_RESREC Power off by Reservated Record POWEROFF_RECEND Power off by End of Recording POWEROFF_SWDOWN Power off by S W Download POWEROF...

Page 21: ...m Check Replace Baterry of R C Check Repair Cable connection Connector solder Normal operating Check B 3 3V On Main B D A22 Normal Voltage Close N N Check 12V on Main B D Replace Power B D or Replace Main B D Power B D don t have problem A12 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 7 11 7 Y Err...

Page 22: ...Check 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 8 11 Standard Repair Process 8 Error symptom Copyright ⓒ 2020 LG Electronics Inc All rights reserved Only training and service purposes ...

Page 23: ...ir Wifi cable connection N Check the Wifi wafer Standard Repair Process Established date Revised date 9 11 9 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 Error symptom Copyright ⓒ 2020 LG Electronics Inc All rights reserved Only training and service purposes ...

Page 24: ...ed as shown in the solution manual For models without any fix information provide the description 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 10 11 Standa...

Page 25: ...ce cabinet Replace remote control Remote control damage Stand dent Replace stand F Exterior defect Exterior defect Established date Revised date 11 11 Standard Repair Process 11 Error symptom Copyright ⓒ 2020 LG Electronics Inc All rights reserved Only training and service purposes ...

Page 26: ...tical Horizontal bar residual image light spot Connection diagram A4 5 A Video error_ Color error Check Link Cable Vx1 reconnection condition A5 6 Adjustment Test pattern ADJ Key A6 7 Appendix Defected Type caused by T Con Inverter Module Exchange Main Board 1 A 1 5 8 Exchange Main Board 2 A 2 5 9 Exchange Power Board PSU A 3 5 10 Exchange Module 1 A 4 5 11 Exchange Module 2 A 5 5 Continue to the ...

Page 27: ...or_ No power Check power input Voltage ST BY 3 5V A12 13 B Power error_Off when on off while viewing POWER OFF MODE checking method A13 14 D Function error IR Cable operation checking method A14 Continued from previous page Copyright ⓒ 2020 LG Electronics Inc All rights reserved Only training and service purposes ...

Page 28: ...tent 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 75 86UH5F Copyright ⓒ 2020 LG Electronics Inc All rights reserved Only training and service purposes ...

Page 29: ... method 1 Press the ADJ button on the remote control for adjustment 2 Enter into White Balance of item 11 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 Error symptom Content Copyright ⓒ 2020 LG Electronics Inc All rights reserved Only training and service purposes ...

Page 30: ...ror video lag stop 1 Checking method for remote control for adjustment Press the IN START with the remote control for adjustment Version ALL MODELS A3 Established date Revised date A3 Error symptom Content Copyright ⓒ 2020 LG Electronics Inc All rights reserved Only training and service purposes ...

Page 31: ...rtical Horizontal bar residual image light spot As the part connecting to the external input check the screen condition by signal A4 Established date Revised date A4 Error symptom Content 75 86UH5F Copyright ⓒ 2020 LG Electronics Inc All rights reserved Only training and service purposes ...

Page 32: ...tion condition A Video error_Color error Check the contact condition of the Link Cable especially dust or mis insertion A5 Established date Revised date A5 Error symptom Content 75 86UH5F Copyright ⓒ 2020 LG Electronics Inc All rights reserved Only training and service purposes ...

Page 33: ... 6 types of patterns using the ADJ 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 A6 Established date Revised date A6 Error symptom Content Copyright ⓒ 2020 LG Electronics Inc All rights reserved Only training and service purposes ...

Page 34: ... CNT Broken Solder defect CNT Broken Solder defect CNT Broken Solder defect CNT Broken Abnormal Power Section Solder defect Short Crack Abnormal Power Section Solder defect Short Crack Appendix Exchange Main Board 1 A 1 5 Copyright ⓒ 2020 LG Electronics Inc All rights reserved Only training and service purposes ...

Page 35: ...r Section Solder defect Short Crack Abnormal Power Section Solder defect Short Crack Fuse Open Abnormal power section Noise GRADATION GRADATION Abnormal Display Copyright ⓒ 2020 LG Electronics Inc All rights reserved Only training and service purposes ...

Page 36: ...Appendix Exchange Power Board PSU No Light Dim Light Dim Light Dim Light No picture Sound Ok A 3 5 Copyright ⓒ 2020 LG Electronics Inc All rights reserved Only training and service purposes ...

Page 37: ... leakage Press damage Crosstalk Crosstalk Press damage Panel Mura Light leakage Press damage A 4 5 Un repairable Cases In this case please exchange the module Copyright ⓒ 2020 LG Electronics Inc All rights reserved Only training and service purposes ...

Page 38: ...ertical Block Source TAB IC Defect Horizontal Block Gate TAB IC Defect Horizontal line Gate TAB IC Defect Gate TAB IC Defect Horizontal Block Gate TAB IC Defect Appendix Exchange the Module 2 A 5 5 Un repairable Cases In this case please exchange the module Copyright ⓒ 2020 LG Electronics Inc All rights reserved Only training and service purposes ...

Page 39: ...echnical Manual Revised date A12 Check power input voltage B Power error _No power A12 Check the DC 20V 12V 15Y 적용 28Pin map PSU Error symptom Content 75 86UH5F Copyright ⓒ 2020 LG Electronics Inc All rights reserved Only training and service purposes ...

Page 40: ...djustment item 3 Standard Repair Process Detail Technical Manual POWER OFF MODE checking method B Power error _Off when on off whiling viewing ALL MODELS A13 Established date Revised date A13 Error symptom Content Copyright ⓒ 2020 LG Electronics Inc All rights reserved Only training and service purposes ...

Page 41: ...condition between IR Main board 2 Check the stand by 3 5V on the terminal M1 3 When checking the Pre Amp when the power is in ON condition it is normal when the Analog Tester needle moves slowly and defective when it does not move at all JK6021 M7 GND M4 3 5V_ST M3 NC M1 IR M6 EYE_SCL M5 EYE_SDA JK4100 Copyright ⓒ 2020 LG Electronics Inc All rights reserved Only training and service purposes ...

Page 42: ...WIFI 2 WIFI_BT_DM 3 WIFI_BT_DP 4 GND 5 WOL WIFI_POWER_ON 6 GND 7 M_RFMODULE_RESET P6201 Error symptom Content Checking order 1 Check BT Wifi cable condition between BT Wifi assy Main board 2 Check the 3 5V on the terminal 2 Checking order to check motion remote wifi Copyright ⓒ 2020 LG Electronics Inc All rights reserved Only training and service purposes ...

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