LG 65UP7670PUC Page 76 Service Manual Download

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Checking order when there is no audio

1. Check the contact condition of or 13.2V connector of Main Board.

2. Measure the 13.2V input voltage supplied from Power Board.

(If there is no input voltage, remove and check the connector.)

3. Connect the tester RX1 to the speaker terminal 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

③

SPK_ R-FT

SPK_ R+FT

SPK_ L-FT

SPK_ L+FT

②

* Depending on models

< Below 75inch_ NANO7*,UP8*,UP77 >

< Below 75inch_UP75/71 >

Only for training and service purposes.

Summary of Contents for 65UP7670PUC

Page 1: ...tion 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 any text graphics or logos in th...

Page 2: ... reserved Only for training and service purposes CONTENTS CONTENTS 2 SAFETY PRECAUTIONS 3 SERVICING PRECAUTIONS 4 SPECIFICATION 6 SOFTWARE UPDATE 9 BLOCK DIAGRAM 11 EXPLODED VIEW 12 ASSEMBLY DISASSEMBLY GUIDE 13 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: ...s are followed each drawing and specification by part number in accordance with BOM 5 The receiver must be operated for about 5 minutes prior to the adjustment 3 Test method 1 Performance LGE TV test method followed 2 Demanded other specification Safety CE IEC specification EMC CE IEC 4 General Specification No Item Specification Remark 1 Market North America 2 Broadcasting system ATSC NTSC M 64 2...

Page 7: ... 22 3840 2160 53 95 23 98 296 7 UDTV 2160P 23 3840 2160 54 24 297 UDTV 2160P 24 3840 2160 56 25 25 297 UDTV 2160P 25 3840 2160 61 43 29 97 296 7 UDTV 2160P 26 3840 2160 67 5 30 297 UDTV 2160P 27 3840 2160 112 5 50 594 UDTV 2160P 28 3840 2160 134 86 59 94 593 4 UDTV 2160P 29 3840 2160 135 60 594 UDTV 2160P 30 3840 2160 225 100 1188 UDTV 2160P 4K120 model K6Hp HDMI 3 4 port O20 or 8K model 31 3840 2...

Page 8: ...7 UDTV 2160P 12 3840 2160 53 95 23 98 296 7 UDTV 2160P 13 3840 2160 54 24 297 UDTV 2160P 14 3840 2160 56 25 25 297 UDTV 2160P 15 3840 2160 61 43 29 97 296 7 UDTV 2160P 16 3840 2160 67 5 30 297 UDTV 2160P 17 3840 2160 112 5 50 594 UDTV 2160P 18 3840 2160 134 86 59 94 593 4 UDTV 2160P 19 3840 2160 135 60 594 UDTV 2160P 20 4096 2160 53 95 23 98 296 7 UDTV 2160P 21 4096 2160 54 24 297 UDTV 2160P 22 40...

Page 9: ...arting SW update 6 After finishing the update it will show a pop up below the picture 7 Click Yes Tv will be turn off and on itself 2 NSU DOWNLOAD This Function is needed to connect to the internet Case 1 Auto Update On 1 Go to Menu All Settings Support Software Update then check Auto update is turned on 2 After the update complete the user can check a pop up below the picture which indicated upda...

Page 10: ... Toggle Item 1 Go to Menu All Settings Support Software Update 2 If it found upper version SW than the TV SW version TV would show a pop up like below the picture The latest version of the SW is available for your TV Do you want to update now 3 Yes update starts No Close the pop up check out later 4 If the user started the update the TV shows a pop up below the picture 5 CHECK NOW Just start the u...

Page 11: ... I2C 0 Vx1 51P 8 lane Vx1 EPI CEDS FCIC SPI I2C 3 Main PMIC IF_S IF GST MCLK GCLK EO I2C 6 NVRAM 256Kb I2C_5 I2C 1 2 EPI block IQ IP TS EPI 60P 65 8 lane 55 6lane CEDS 68P Area OPT USB_WIFI 1 5V DDR 0 95V Core 3 3V Normal 1 0V CPU 3 5V ST_B Y 1 8V 5V Normal Sub PMIC 0 96V 1 5V 3 3V 5V 1V 1 8V 3 5V_ST 0 95V 1 5V 3 3V 13V 3 3V 5V 5V 1V 1 8V 1 8V 3 5V_ST 3 5V_ST 3 3V 3 5V_ST 3 5V_ST 13V 3 5V_ST 13V 1...

Page 12: ...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 13: ...tion Holder_8EA Side AV_2EA Remove both the right side latch and left side latch Hold the Right Left bottom handle and lift the B C At the same time gently pushing the push points Separate the B C from bottom to top direction first lower side and then the upper side If push with strong force from left side Side Latch will break PUSH PULL Step1 Lower Right Left Side Step2 Upper Right Left Side PUSH...

Page 14: ...g the mark O and lift the bottom of the B C push the B C in the upward direction Caution Latch can be separated on the top position don t pull it hard for upward Latch can be have damage Must be refer to disassembly Video 2 Detach Tape Damage Holder when you have wrong disassembly method Deformation OK NG ...

Page 15: ...5 Copyright LG Electronics Inc All rights reserved Only for training and service purposes 3 After Screw Disassemble please remove IR WIFI BRACKET and HARNESS 4 Remove all sort of cable Screw 1EA M3 5 5 2 ...

Page 16: ...urposes 5 After Screw Disassemble remove POWER MAIN PCB 6 Remove Speaker 7 After Screw Disassemble remove the Vesa SUPPORTER and 2Pole Supporter Screw 9EA M3 5 5 3 SCREW TORQUE NO3 SCREW 5 7Kgf cm Screw 4EA M3 5 5 2 Screw 4EA M4 8 4 SCREW TORQUE NO2 SCREW 5 7Kgf cm NO4 SCREW 8 12Kgf cm ...

Page 18: ...nly for training and service purposes Assembly 1 Attach the INSULATOR 2 Assemble Fix the Vesa SUPPORTER and 2Pole Supporter 1 Assemble the screw after insert ⓐ ⓑ ⓐ ⓑ Screw 4EA M3 5 5 2 Screw 4EA M4 8 4 SCREW TORQUE NO2 SCREW 5 7Kgf cm NO4 SCREW 8 12Kgf cm ...

Page 19: ... All rights reserved Only for training and service purposes 3 Assemble SPEAKER 4 Assemble Fix the POWER MAIN PCB Press the edge of mark rubbing it using palm to insert Speaker Rubber Screw 9EA M3 5 5 3 SCREW TORQUE NO3 SCREW 5 7Kgf cm ...

Page 20: ... the HARNESS Insert the HARNESS 1 MAIN P9101 MODULE A 2 MAIN P9100 MODULE B 3 MODULE C POWER P801 4 MAIN P1000 POWER P201 5 MAIN P5300 SPEAKER D SPEAKER E 6 Assemble Fix the IR WIFI BRACKET and HARNESS Screw 1EA M3 5 5 2 Insert the HARNESS 1 BRACKET HARNESS MAIN P4000 SCREW TORQUE NO2 SCREW 5 7Kgf cm ...

Page 21: ...purposes 7 Arrange the harness Attach the Tape 8 Assemble Fix the COVER Assy REAR Screw 10EA M3 5 5 2 Screw 2EA P4 10 SCREW TORQUE NO2 3 SCREW 5 7Kgf cm When assemble the rear cover cover from upper side or cover horizontally 3 Press the edge mark rubbing it using palm to insert Latch ...

Page 22: ...M located to floor such as a table where the entire outside of C Top can be supported 2 Disassemble SPCB Cover Shield screws 7ea Use General Screw Driver and detach the bridge protect black tape 2ea When you detach the tape be careful not to crumple or tear the contents inside 3 Disassemble the screw and tape and then move each SPCB cover shield L R to disassemble it ...

Page 23: ...ing screw Guide Panel Back 3 sided Screw Spec M2 4 0mm Tapping Screw BLACK Location Up 5ea Left 3ea Right 3ea Driver Normal size screw TIP Driver is available 5 Disassemble 7screws on the lower side of the C top Screw Spec M3 8 Silver Driver Normal size screw TIP Driver is available Guide Panel Back Screw point UP LEFT RIGHT ...

Page 24: ...nd then disassemble the SPCB from the bottom side of the hook of the holder Holder quantity is Left 4ea Right 4ea And below image is just right side 7 Reverse LCM Must be worked more than two people one on the left and one on the right side with both hands reverse 180 degrees Case Top down Screw already released so be caution Case top down falling when Reverse LCM 8 Case Top Down release disassemb...

Page 25: ...e Panel all rounded hook Remove Guide Panel Board assy with UP Direction 1 2 3 1 2 3 Right up corner UP Left up corner Left Right Working sequence from 1 Outside to 5 Inner Hook release Left down Reverse SPCB and attach SPCB with Tape on Panel for preventing SPCB Damage while down side Hook release Use Straight Driver With releasing Guide Panel Hook Working sequence from 1 Outside to 5 Inner Hook ...

Page 26: ...T other than that the corners are Right angle or Rounded 11 Disassembly of 19ea Support Diffuser Plates Rotate the Support DP counterclockwise 45 degrees to align it to the assembly hole and lift it upwards to disassemble Total 19ea 12 Disassemble the Reflector Sheet As the reflector hole is fixed to the lens disassemble the reflector by release the the fixation of lens from the end on the right S...

Page 27: ...e and lift it up and release it Total 8ea 14 Disassemble the Led Array and Attach the New Led Array Disassemble the Led Array Bar Led Array and Cover Bottom are fixed with two sided tape so use appropriate force to cover the Led Array Take it off and attach a new Led Array 15 Assembly of the Led array connector Attach the connector on the wire ass y by pushing it upward and downward Locking Point ...

Page 28: ...ght of the reflector and assemble two support plates first 18 1 Fixing the Reflector Lens Hole Tighten the reflector hole to the lens in order of No 1 2 3 4 in the figure below Use Card or nail to insert the reflector sheet into the bottom of the lens It is recommended to push the reflector sheet into the bottom of the lens using tools such as a card as it may be difficult to tighten when using na...

Page 29: ...sembly the Support DP is vertical Position to the LCM 19 Assembly of Sheet 1 sheets and Diffuser Plate Place 1 sheets 1 Diffuser Plate on top of Cover Bottom Assemble the sheet shape Chamfer on the front left side of the SET Precautions Check that the sheet hanging hole on the upper lower left right outer is properly seated on the cover Bottom Sheet hanging Left down Chamfer SET Front Direction Sh...

Page 30: ...rection in line with the cover Bottom face to tighten it and then tighten it in order of 2 and 3 Check Hook fastening Gap of Sheet and guide panel 21 Case Top Down assembly Insert Side direction 22 C Top Lower side Screw 7ea assembly Screw Spec M3 8 Silver Driver M3 Screw Module Driver available Caution While Screw assembly be care SPCB COF damage from driver Tip 1 2 1 1 1 4 3 3 ...

Page 31: ...ses 23 Reverse LCM Must be worked more than 2 people one on the left and one on the right side with both hands reverse 180 degrees 24 Assemble the Panel SPCB L R to the SPCB Holder First enter the upper part of the holder and then press the lower part of the holder to tighten the SPCB 2 1 ...

Page 32: ...poses 25 Assemble the Guide Panel tightening screw Guide Panel Back 3 sided Screw Spec M2 4 0mm Tapping Screw BLACK Location Up 5ea Left 3ea Right 3ea Driver Normal size screw TIP Driver is available 26 Assemble SPCB Cover shield to Cover Bottom Guide Panel Back Screw point UP LEFT RIGHT ...

Page 33: ... All rights reserved Only for training and service purposes 27 Assemble SPCB Cover shield screws 7ea Use M3 Screw module Driver and attach the bridge protect black tape 2ea After attach the tape bridge should not be seen FINISH OK NO ...

Page 35: ...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 MR21 operating checking 12 11 12 Wifi 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 is...

Page 36: ... 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 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 or EPI or CEDS Cable...

Page 37: ...dio 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 A18 Established date Revised date Error symptom 2 Copyright 2021 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 38: ...ain B D 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 Established date Revised date Er...

Page 39: ...r 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 A28 A7 Standard Repair Process Established date Revised date Error symptom 4 Copyright 2021 LG Electronics Inc All rig...

Page 40: ...I 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 con ...

Page 41: ...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 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 Close Copyright 2021 LG Electronics Inc All rights reserved Only for training and service ...

Page 42: ...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 End Established date Revised date Error symptom Standard Repair Process 7 Abnormal 1 Copyright 2021 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 43: ... 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_ERROR Power off by module error OLED CONDITION OLED Module send signal to micom Check Change OLED Module ONRF...

Page 44: ...ace Power Board and repair parts Check Speaker disconnection N Y Replace Speaker Replace MAIN Board End C Audio error No audio Normal video A21 A22 A18 Disconnection Established date Revised date Error symptom Standard Repair Process 9 Copyright 2021 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 45: ...ternal 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 13 2V Replace Main B D In case of External Input signal error Check and fix external device Replace Main...

Page 46: ...m 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 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 A23 Replace Main B D Y A22 Standard Repair Process Established date Revised date Error symp...

Page 47: ...rocess Established date Revised date Error symptom Replace MR21 Turn AC off on the set and press the wheel after 10sec Press the Home Back key about 5sec Close If you conduct the loop at 3times change the MR21 Y Check the INSTART menu RF Receiver ver is 00 00 Y N Change the RF Receiver assy Or RF Receiver Cable Y RF Receiver ver is 00 00 N A24 A4 A4 12 Turn AC off on the set Copyright 2021 LG Elec...

Page 48: ...r Wifi cable connection N Check the Wifi wafer 1pin Standard Repair Process Established date Revised date 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 2021 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 49: ... 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 Error symptom Standard Repair Process 14 Copyright 2021 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 50: ...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 51: ...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 2021 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 52: ... 6 A Video error _Vertical Horizontal bar residual image light spot Connection diagram A6 7 A Video error_ Color error Check Link Cable Vx1 EPI CEDS 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 Only using T con model 1...

Page 53: ...o 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 Service remote control A24 A26 21 Check items after Main B D replacement A27 22 Adjustment Test pattern ADJ Key A28 Continued from p...

Page 54: ...ck 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 Depending on models 43 50 55 70 75 60 65 Copyright 2021 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 55: ...ideo Normal audio A2 ALL MODELS Entry method 1 Press the ADJ button on the remote control for adjustment 2 Enter into White Balance 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 Copyright 2021 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 56: ...r 10dB 15dB 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 2021 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 57: ... error 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 Copyright 2021 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 58: ...ply 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 Depending on models Below 75inch_ NANO7 UP8 UP77 77 Below 75inch_UP75 71 Copyright 2021 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 59: ...ight 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 Depending on models Below 75inch_ NANO7 UP8 UP77 Below 75inch_UP75 71 Copyright 2021 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 60: ...on 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 Depending on models 43 50 75 55 70 60 65 Copyright 2021 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 61: ...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 2021 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 62: ...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 2021 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 63: ...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 2021 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 64: ...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 2021 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 65: ...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 2021 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 66: ...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 2021 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 67: ...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 2021 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 68: ...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 2021 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 69: ...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 2021 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 70: ...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 2021 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 72: ...k front Power Indicator B Power error _No power A17 Established date Revised date Error symptom Content A17 ST BY condition On or Off Power ON condition Turn Off Copyright 2021 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 73: ...21U1 114 3 139 7 55UP77 78 EAY65895611 LGP55T 21U1 111 6 136 4 55UP75 76 EAY65149301 LGP55T 19U1 175 5 214 5 50UP8 NANO7 EAY65895511 LGP50NT 21U1 97 2 118 8 50UP77 78 EAY65895601 LGP50T 21U1 95 4 116 6 50UP75 76 EAY65769221 LGP50T 20U1 152 1 185 9 43UP77 78 UP8 NANO7 EAY65895501 LGP43NT 21U1 68 4 83 6 43UP75 76 EAY65170101 LGP43T 19U1 114 3 139 7 Power Check Sequence 1 AC input Check SK100 100 240...

Page 74: ...ment 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 RELEASE Copyright 2021 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 75: ...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 2021 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 76: ...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 FT 2 SPK_ R FT 3 SPK_ L FT 4 SPK_ L FT Depending on models Below 75inch_ NANO7 UP8 UP77 Below 75inch_UP75 7...

Page 77: ...n checking method D Function error A22 Established date Revised date Error symptom Content A22 Checking order to check remote control IR EYE Sensor Pin Pin name 1 VCC 2 USB_DM 3 USB_DP 4 GND 5 WOL WIFI_ON 6 VCC 7 WIFI_Suspend Resume 8 GND 9 Combo_Reset 10 BT_WAKEUP_HOST 11 GND 12 VCC 13 14 15 16 EYE_SDA 17 EYE_SCL 18 GND 19 IR 20 LED_R 21 GND 22 VCC 23 KEY2 24 MIC_DATA 25 MIC_CLK Depending on mode...

Page 78: ...minal 22 Checking order to check motion remote wifi Wifi BT Front Wifi BT Rear A23 Pin Pin name 1 VCC 2 USB_DM 3 USB_DP 4 GND 5 WOL WIFI_ON 6 VCC 7 WIFI_Suspend Resume 8 GND 9 Combo_Reset 10 BT_WAKEUP_HOST 11 GND 12 VCC 13 14 15 16 EYE_SDA 17 EYE_SCL 18 GND 19 IR 20 LED_R 21 GND 22 VCC 23 KEY2 24 MIC_DATA 25 MIC_CLK Depending on models Below 75inch_ NANO7 UP8 UP77 Below 75inch_UP75 71 Copyright 20...

Page 79: ... to use the Service 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 the remote control RELEASE Copyright 2021 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 80: ...a 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 factory mo...

Page 81: ... 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 external i...

Page 82: ... 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 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 RELEASE Copyright 2021 LG Electronics Inc All rights res...

Page 83: ...ns 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 A28 Established date Revised date Error symptom Content A28 E Etc Copyright 2021 LG Electronics Inc All rights reserved Only for training and service purposes ...

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