LG 50US665H0VA Service Manual Download Page 61

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1. Check IR cable connect condition between IR & Main board.
2. Check the +3.5V_ST on the terminal 22 pin.
3. As checking the Pre-Amp on IR/LED board, the power is in ON condition, an Analog

Tester needle should move slowly, otherwise, it’s defective.

Standard Repair Process Detail Technical Manual

Remote control operation checking method

D. Function error

A22

Established

date

Revised

date

Error

symptom

Content

A22

Pin name

+3.5V_WIFI

WIFI_DM

WIFI_DP

GND

WOL/WIFI_POWER_ON

+3.5V_WIFI

WIFI_SUSPEND/RESUME

GND

COMBO_RESET

BT_WAKEUP_HOST

GND

+3.5V_WIFI

EYE_SDA

EYE_SCL

GND

LED_R

GND

+3.5V_ST

KEY2

GND

Only for training and service purposes.

Summary of Contents for 50US665H0VA

Page 1: ...poses Any reproduction duplication distribution including by way of email facsimile or other electronic means publication modification copying or transmission 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 an...

Page 2: ...ts reserved Only training and service purposes CONTENTS CONTENTS 2 SAFETY PRECAUTIONS 3 SERVICING PRECAUTIONS 4 SPECIFICATION 6 SOFTWARE UPDATE 10 BLOCK DIAGRAM 12 EXPLODED VIEW 13 ASSEMBLY DISASSEMBLY GUIDE 14 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: ...ogue TV PALB B B G D K I SECAM B G D K NTSC M Asia MEA T G V Depending on country 3 Program coverage 1 Digital TV DVB T DVB T2 VHF III 174 230 MHz UHF IV 470 606 MHz UHF V 606 862 MHz S Band II 230 300 MHz S Band III 300 470 MHz DVB S S2 950 2150 MHz DVB C 46 890 MHz 2 Analogue TV 46 862 MHz Only DVB T2 C S2 support model only 4 Maximum number of storable programmes 1 DVB S S2 6 000 2 DVB C DVB T ...

Page 7: ... 15 625 50 13 5 SDTV DVD 576I 625I 50Hz 4 720 480p 31 47 59 94 27 SDTV 480P 5 720 480p 31 5 60 27 027 SDTV 480P 6 720 576p 31 25 50 27 SDTV 576P 50Hz 7 1280 720 44 96 59 94 74 176 HDTV 720P 8 1280 720 45 60 74 25 HDTV 720P 9 1280 720 37 5 50 74 25 HDTV 720P 50Hz 10 1920 1080 28 125 50 74 25 HDTV 1080I 50Hz 11 1920 1080 33 72 59 94 74 176 HDTV 1080I 12 1920 1080 33 75 60 74 25 HDTV 1080I 13 1920 10...

Page 8: ...or FHD 25 3840 2160 61 43 29 97 296 7 UDTV 2160P Not Support for FHD 26 3840 2160 67 5 30 297 UDTV 2160P Not Support for FHD 27 3840 2160 112 5 50 594 UDTV 2160P Not Support for FHD 28 3840 2160 134 86 59 94 593 4 UDTV 2160P Not Support for FHD 29 3840 2160 135 60 594 UDTV 2160P Not Support for FHD 30 3840 2160 225 100 1188 UDTV 2160P 4K120 model K6Hp HDMI 3 4 port O20 or 8K model Not Support for ...

Page 9: ...60P Not Support for FHD 15 3840 2160 61 43 29 97 296 7 UDTV 2160P Not Support for FHD 16 3840 2160 67 5 30 297 UDTV 2160P Not Support for FHD 17 3840 2160 112 5 50 594 UDTV 2160P Not Support for FHD 18 3840 2160 134 86 59 94 593 4 UDTV 2160P Not Support for FHD 19 3840 2160 135 60 594 UDTV 2160P Not Support for FHD 20 4096 2160 53 95 23 98 296 7 UDTV 2160P Not Support for FHD 21 4096 2160 54 24 29...

Page 10: ...atically TV manager application is launched and detect the SW version 3 Select UPDATE button 4 TV is updating 5 After finished the update below Pop up appears then TV will reboot automatically 6 Check the updated SW Version and Tool Option If the software version on the USB device is equal to or lower than the version currently installed on the TV it cannot be updated in User Mode ...

Page 11: ...iple items all at once e g TV CPU Micom TLL Image Icon Video Pro Idiom M Key files Data Coning make and apply clone file Image Download Image Download downloads Boot Logo Image Apps Background Image s and Hotel Directory Image s at once Icon Download Icon Download downloads Hotel Icon on Portal Website Shortcut and Input Shortcut images at once Video Download Video Download downloads Hotel Video a...

Page 12: ... SYVL64 I2S Out I2C 0 CEDS 68P 11Lane Vx1 EPI CEDS I2C 3 GMA PMIC Level shifter M0 IF_S IF I2C 3 NVRAM 1Mb I2C 5 I2C 2 EPI CEDS block IQ IP TS DDR4 2666 48bit Sub MICOM TI I2C EYE I2C SW UART 1 MCU D L X_TAL 32 768KHz Normal Comm Ethernet HUB LAN1 AUX UART 0 UART SW RS 232 5V 12V power outlet Adjust debug TV Link Com UART SW Ext SPK AMP USB1 2 0 OCP USB2 2 0 HDMI3 HDMI2 ARC HDMI1 X_TAL 25MHz Sub M...

Page 13: ...n Model 200 EXPLODED VIEW 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 manufactu...

Page 14: ...DISASSEMBLY GUIDE 1 Unscrew 1 9EA 2 5EA 3 1EA to uncover back cover assembling from module 2 Remove a cable after uncovering the back cover 1 MODULE A POWER P801 2 MAIN P1000 POWER P201 3 MAIN P4000 WIFI Ass y 4 MAIN P5800 SPEAKER B C 1 1 1 1 1 2 2 2 2 2 1 1 1 1 3 C A P801 P201 P1000 P5800 B P4000 ...

Page 15: ...t LG Electronics Inc All rights reserved Only training and service purposes 3 Unscrew 4 1EA and then remove wifi bracket 4 Unscrew 5 9EA and then remove harness cable MAIN P7600 MODULE D 4 5 5 5 5 5 5 5 5 5 D P7600 ...

Page 16: ... 16 Copyright LG Electronics Inc All rights reserved Only training and service purposes 5 Remove all boards cables and speakers 6 Unscrew 6 4EA to remove VESA brackets and then pick them out 6 6 6 6 ...

Page 19: ...off while viewing 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 11 MR20 operating checking 12 12 Wi Fi operating checking 13 13 External device recognition error 14 14 E Noise Circuit noise Mechanical noise 15 15 F Exterior error Exterior defect 16 First of all Check whether there i...

Page 20: ...k record S W Version White Balance value before replacing the Main Board Replace Main Board Re write Tool option Area option and White Balance value Precaution Established date Standard Repair Process Revised date Error symptom A Video error No video Normal audio A18 A1 A18 A2 A4 First of all Check whether all of cables between boards is assembled properly or not Main B D Power B D Vx1 or EPI Cabl...

Page 21: ...ck and replace Main B D Y Replace Power B D or repair parts N Standard Repair Process A Video error No video No audio A18 Established date Revised date Error symptom 2 End Copyright 2020 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 22: ... D Normal Picture Y N Y Y By using Digital signal level meter By using Diagnostics menu on OSD All Settings Programmes Programme Tuning Settings 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 N A4 Standard Repair Process Established date Revised date Error sy...

Page 23: ...t AV error 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 Replace module Request repair for external device cable Color error Check Test pattern A28 A7 Standard Repair Process Established date Revised date Error symptom 4 End Copyright 2020 LG Electronics In...

Page 24: ...MI 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 AV HDMI Request repair for external device Component AV error HDMI Connect other external device and cable Check normal operation of External Input Component AV and HDMI by connecting Jig pattern Generator Set top Box etc Replace Main T con B D Sc...

Page 25: ...sure voltage of each output of Power B D N Y Normal voltage Replace Main B D N Y OK Replace Main B D N Y Normal Check St by 7 8V Replace Power B D N Y Normal voltage Replace Power B D Y A17 A18 A18 A18 Standard Repair Process Established date Revised date Error symptom 6 Stand By Red or Turn On Operating Turn Off End Copyright 2020 LG Electronics Inc All rights reserved Only for training and servi...

Page 26: ... 2 phase out Check A C cord Check for all 2 phase power out Check outlet Replace Main B D CPU Abnormal Replace Power B D N Y Normal Established date Revised date Error symptom Standard Repair Process 7 No Poling End Copyright 2020 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 27: ...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_ERR...

Page 28: ...Y Reassemble Speaker and cable Replace Main B D C Audio error No audio Normal video A20 A21 A18 Disconnection Established date Revised date Error symptom Standard Repair Process 9 Y N Replace Speaker or cable Normal End Replace Speaker or cable Y N Normal End Y N Normal End Replace Main B D Copyright 2020 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 29: ...r External 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 normal When RF signal is not received Request repair to external cable ANT provider Y Check audio B Voltage 13 2V Replace Main B D In case of External Input signal error Check and fix external device Replace Main B ...

Page 30: ...om Check Replace Baterry of R C Check Repair Cable connection Connector solder Normal operating Check B 3 5V On Main B D A22 Normal Voltage N N Check 13 2V from Power B D Replace Power B D A18 Check IR input 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 Error symptom 11 Y End End Copyright 2020 LG Electronics Inc A...

Page 31: ...d date Revised date Error symptom Replace MR20 Turn off on the set and press the wheel Press the Home Back key about 5sec If you conduct the loop at 3times change the MR20 Y Check the INSTART menu RF Receiver ver is 00 00 Y Check Repair RF assy connection N Replace the RF Receiver assy Y RF Receiver Ver is 00 00 N A23 A4 A4 12 End End End End Copyright 2020 LG Electronics Inc All rights reserved O...

Page 32: ...ection N Check the voltage at 1pin of Wi Fi wafer Standard Repair Process Established date Revised date Error symptom 13 Replace the Wi Fi assy Normal Voltage Y Y N Replace Main B D Wi Fi Mac value is NG N A23 A4 A4 A23 End End Copyright 2020 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 33: ...or Check and fix external device cable HDMI 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 Error symptom Standard Repair Process 14 Copyright 2020 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 34: ...ceed 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 Error symp...

Page 35: ...lace cabinet Replace remote control Remote control damage Stand dent Replace stand F Exterior defect Exterior defect Established date Revised date Error symptom Standard Repair Process 16 Copyright 2020 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 36: ...A5 6 A Video error_Vertical Horizontal bar residual image light spot Connection diagram A6 7 A Video error_Color error Check Link Cable Vx1 or EPI CEDS reconnection condition A7 8 Appendix Defected Type caused by Parts 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 Only for using T con board 12 Exchang...

Page 37: ... Normal 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 Motion Remote operation checking method A23 20 E Etc How to use the Factory SVC Remote control A24 A26 21 Check items after Main B D replacement A27 22 Adjustment Test pattern ADJ Key A28 Continued fro...

Page 38: ...tom Content Check back light with naked eye A Video error_No video Normal audio After disassembling a back cover and turning on TV check with the naked eye whether you can see light from locations A1 Copyright 2020 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 39: ...deo error_No video Normal audio A2 1 Press ADJ button of the Factory SVC remote control 2 Enter into 11 White Balance 3 After recording the R G B value Gain Cut of each Color Temp Cool Medium Warm write the value after replacing a Main board Copyright 2020 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 40: ...tor 10dB 15dB 20dB etc Standard Repair Process Detail Technical Manual Tuner input signal strength checking method A Video error_Video error video lag stop A3 Established date Revised date Error symptom Content A3 Copyright 2020 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 41: ... method A Video error_Video error video lag stop Press IN START button of the on Factory SVC remote control Version A4 Established date Revised date Error symptom Content A4 Copyright 2020 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 42: ... each voltage from power supply finally replace the Main board Standard Repair Process Detail Technical Manual Tuner checking part A Video error_Video error video lag stop A5 Established date Revised date Error symptom Content A5 Copyright 2020 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 43: ..._Vertical 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 Copyright 2020 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 44: ...EDS reconnection condition A Video error_Color error Check connect condition of the Link Cable especially dust or misassembling A7 Established date Revised date Error symptom Content A7 Copyright 2020 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 45: ...n of 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 Copyright 2020 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 46: ...lor spread FFC connection problem CABLE Color spread FFC connection problem CABLE Screen stop Due to foreign substance within FFC PIN Appendix Examples of Symptoms Image error Check for poor cable contact Copyright 2020 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 47: ...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 2020 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 48: ...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 2020 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 49: ...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 2020 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 50: ...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 2020 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 51: ...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 2020 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 52: ...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 2020 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 53: ...ure 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 Only if using T con Board Copyright 2020 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 54: ...en 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 Only if using T con Board Copyright 2020 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 56: ...wer error _No power A17 Established date Revised date Error symptom Content A17 ST BY condition On or Off Depending on Standby Light setting in Additional Settings Power On condition Turn Off Copyright 2020 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 57: ...e mode MS 3V 2 75 3 25 On Store Mode Power Check Sequence 1 AC input Check SK100 100 240Vac 2 PWR ON Check P201 1 pin Set On above 3V Set St by 0V 3 13 2V DC Check P201 4 8 pin Set On 13 2V Set St by 7 8V 4 MS Level Check P201 11 Pin 5 LED voltage Check P801 LED B Home mode General Customer Store mode use Store SK100 AC input Power Board is no problem if all the conditions are satisfied A18 Copyri...

Page 58: ...n Off Status Standard Repair Process Detail Technical Manual POWER OFF MODE checking method B Power error _Off when on off whiling viewing A19 Established date Revised date Error symptom Content A19 Copyright 2020 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 59: ... 4 Select Internal TV Speaker Standard Repair Process Detail Technical Manual Checking method in menu when there is no audio C Audio error_No audio Normal video A20 Established date Revised date Error symptom Content A20 Copyright 2020 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 60: ... and if you hear the Chik Chik sound when you touch the GND and output terminal the speaker is normal 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 SPK_R 2 SPK_R 3 SPK_L 4 SPK_L Copyright 2020 LG Electronics Inc All rights reserved Only for ...

Page 61: ...Manual Remote control operation checking method D Function error A22 Established date Revised date Error symptom Content A22 Pin Pin name 1 3 5V_WIFI 2 WIFI_DM 3 WIFI_DP 4 GND 5 WOL WIFI_POWER_ON 6 3 5V_WIFI 7 WIFI_SUSPEND RESUME 8 GND 9 COMBO_RESET 10 BT_WAKEUP_HOST 11 GND 12 3 5V_WIFI 13 NC 14 NC 15 NC 16 EYE_SDA 17 EYE_SCL 18 GND 19 IR 20 LED_R 21 GND 22 3 5V_ST 23 KEY2 24 GND 25 GND Copyright ...

Page 62: ...3 5V_WIFI on the terminal 1 6 12 Wi Fi BT board Front A23 Pin Pin name 1 3 5V_WIFI 2 WIFI_DM 3 WIFI_DP 4 GND 5 WOL WIFI_POWER_ON 6 3 5V_WIFI 7 WIFI_SUSPEND RESUME 8 GND 9 COMBO_RESET 10 BT_WAKEUP_HOST 11 GND 12 3 5V_WIFI 13 NC 14 NC 15 NC 16 EYE_SDA 17 EYE_SCL 18 GND 19 IR 20 LED_R 21 GND 22 3 5V_ST 23 KEY2 24 GND 25 GND Wi Fi BT board Rear Copyright 2020 LG Electronics Inc All rights reserved Onl...

Page 63: ...o use the Factory SVC Remote control E Etc A24 Established date Revised date Error symptom Content A24 0 4 1 3 0 4 1 3 1 How to access Factory SVC Remote control Copyright 2020 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 64: ...O Cinema Cricket Football HDR Effect FILMMAKER MODE Expert Bright Room Expert Dark Room SSM Added Function Change in the order of AI Sound Standard Cinema Clear Voice III Cricket Football Music Game AI Sound 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 factory mode Simplink Ad...

Page 65: ...B 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 outgoing condition VOL Volume Up Down CH Channel Up Down AV1 2 3 Added function Change to AV 1 2 3 COMP1 2 Added function Change to Component 1 2 HDMI1 2 3 4 Add function Change...

Page 66: ...r after checking the ID label on the back cover 1 Press IN START button of the Factory SVC remote control 2 Press ADJ button of the Factory SVC remote control No 11 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 2020 LG Electronics Inc All rights reserved Only for trainin...

Page 67: ...rns using ADJ button 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 A28 Established date Revised date Error symptom Content A28 E Etc Copyright 2020 LG Electronics Inc All rights reserved Only for training and service purposes ...

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