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LG 65UN72 TF Series Service Manual
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LG 65UN72 TF Series Service Manual

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LED TV
SERVICE MANUAL
CHASSIS : UBX3E
MODEL : 65UN72***TF / 7240PVG
CAUTION
BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
P/NO : MFL71710501 (2010-REV01)
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, any text, graphics or logos in this Service
Manual.
Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
65UN7340PVC / 73*0PT*
65UN731C0GC / TC / VC

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Summary of Contents for LG 65UN72 TF Series

  • Page 1 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.
  • Page 2 SPECIFICATION ..................6 SOFTWARE UPDATE ................10 BLOCK DIAGRAM ................. 11 EXPLODED VIEW .................. 12 ASSEMBLY / DISASSEMBLY GUIDE ........... 14 TROUBLE SHOOTING GUIDE ..........APPENDIX - 2 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 3 When the exposed metal has no return path to the chassis the reading must be infinite. An other abnormality exists that must be corrected before the receiver is returned to the customer. - 3 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 4 - 4 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 5 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. - 5 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 6 PAL, SECAM, NTSC 4 System : PAL, SECAM, NTSC, PAL60 Audio Input DVI Audio, Component, AV 10 SPDIF out Optical Audio out Ethernet Connect - 6 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 7 1920*1080 56.25 148.5 HDTV 1080P 1920*1080 67.43 59.94 148.35 HDTV 1080P 1920*1080 67.5 148.5 HDTV 1080P 1920*1080 112.5 UDTV 2160P Not Support for FHD. - 7 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 8 107.89 23.98 1188 7680*4320 1188 7680*4320 1188 7680*4320 131.87 29.97 1188 8K Model Only. 7680*4320 1188 7680*4320 2376 7680*4320 263.74 59.94 2376 7680*4320 2376 - 8 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 9 241.5 Support only when UHD DeepColor is On (UHD, 8K 120Hz models 2560*1440 182.99 119.99 497.7 only), Support only when UHD DeepColor is On - 9 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 10 (6) Turn OFF the TV and On. Check the updated SW Version (8) After TV turned on, Check the updated SW Version and and Tool Option. Tool Option. - 10 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 11 BLOCK DIAGRAM - 11 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 12 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. - 12 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 13 EXPLODED VIEW (MODULE) IMPORTANT NOTICE MRC use only * MRC : Module Repair Center - 13 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 14 (3) Rear AV Screw (③) Assembly * Do not wear items that may damage the appearance of the product * SCREW TORQUE : 5 ~ 7Kgf.cm - 14 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 15 (2) Insert the finger of the back cover bottom section triangle hole and disassemble it. * Do not wear items that may damage the appearance of the product. * SCREW TORQUE : 5 ~ 7Kgf.cm - 15 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 16 ■ Step 4. Case Top Screw disassemble (back side screw) and Case Top disassemble Top/Side down *top 9ea / side L 5ea / side 5 6ea / down(side) 9ea - 16 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 17 ■ Step 7 Optical Sheet disassemble (DS, Prism middle, Prism down, DP) ■ Step 8 DPS, LED Fixer disassemble & Reflector Sheet disassemble *rotate DPS (12ea) *push LED fixer in back (5ea) - 17 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 18 (2) Press the LED Array on the surface of Cover Bottom. (3) Connect the CNT to the LED Array. * Finish the Attached LED Array (5ea) - 18 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 19 TROUBLE SHOOTING GUIDE Copyright © 2020 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 20 E. Noise Circuit noise, Mechanical noise F. Exterior error Exterior defect First of all, Check whether there is SVC Bulletin in GSCS System for these model. Copyright © 2020 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 21 Always check & record S/W Version, White Replace Main Board Re-write Tool option, Area option and White Balance value Balance value before replacing the Main Board Copyright © 2020 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 22 Revised date ☞A18 Check 13.2V from Check and No video Normal Power B/D replace Main B/D No audio voltage? Replace Power B/D or repair parts Copyright © 2020 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 23 Bulletin? soldering 1. Reconnection 2. Install Booster S/W Upgrade Contact with signal distributor Normal Replace or broadcaster (Cable or Air) Picture? Main B/D Normal Picture? Copyright © 2020 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 24 Replace Main/T-con B/D error normal cable Request repair for external device/cable External Check external HDMI Replace Main/T-con B/D device/cable error device and cable normal Copyright © 2020 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 25 (Check normal operation of Replace HDMI External Input, Component, Screen Main /T-con AV and HDMI by connecting normal? Jig, pattern Generator ,Set- top Box etc. Copyright © 2020 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 26 Measure voltage of each output of Power B/D Normal? Normal ☞A18 Replace Main B/D voltage? Normal Check St-by 7.8V voltage? Replace Power B/D Replace Power B/D Copyright © 2020 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 27 Normal? Abnormal Check for all 2- phase Replace Power B/D power out No Poling Fix A/C cord & Outlet and check each 2 phase out Copyright © 2020 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 28 Reboot by SW down load function UNKNOWN No meaning (same as initial value) COMP_END OLED threshold voltage degradation(Compensation) completes. PNWASHDONE Power off by panel noise wash function complited. (OLED) Copyright © 2020 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 29 Check Speaker Disconnection Replace Speaker or cable Normal connection Reassemble Speaker and cable Replace Main B/D Normal Replace Speaker or cable Normal Replace Main B/D Copyright © 2020 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 30 (In case of Connect and check Normal External Input other external audio? signal error) device Check and fix external device Check and fix external device Copyright © 2020 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 31 Baterry of R/C Replace Power B/D in room If R/C operate, Normal operating? Explain the customer cause is interference from light in room. Replace R/C Copyright © 2020 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 32 RF Receiver message? Ver is about 5sec “00.00”? Replace MR20 Replace the RF Receiver assy * If you conduct the loop at 3times, change the MR20. Copyright © 2020 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 33 1pin of Wi-Fi wafer Main B/D INSTART menu “NG”? ☞A23 Check & Repair Wi-Fi cable connection ☞A4 Wi-Fi Mac value is “NG”? Replace the Wi-Fi assy Copyright © 2020 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 34 Recognition error - S/W Version HDMI, Optical Check and fix Recognition Replace Main B/D Fix in external device/cable error accordance with technical information Copyright © 2020 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 35 “Part related to nose” in the Owner’s then proceed as shown in the solution manual Manual. (For models without any fix information, provide the description) Copyright © 2020 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 36 Revised date Zoom part with Module Replace module exterior damage damage Cabinet Replace cabinet damage Remote control Replace remote control damage Stand Replace stand dent Copyright © 2020 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 37 Exchange Module (1) ~ (3) A-8/11 A-9/11 ~ Only for using Exchange T-Con (1) ~ (2) T-con board A-10/11 Exchange Power Board(PSU) A-11/11 Continue to the next page Copyright © 2020 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 38 Motion Remote operation checking method How to use the Factory SVC Remote control A24-A26 E. Etc Check items after Main B/D replacement Adjustment Test pattern - ADJ Key Copyright © 2020 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 39 Check back light with naked eye date After disassembling a back cover and turning on TV, check with the naked eye, whether you can see light from locations. Copyright © 2020 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 40 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 41 When the signal is strong, use the attenuator (-10dB, -15dB, -20dB etc.) All Settings  Programmes  Programme Tuning & Settings  Manual Tuning Copyright © 2020 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 42 A. Video error_Video error, video lag/stop symptom date Revised Content Version checking method date Version Press ‘IN START’ button of the on Factory SVC Remote control. Copyright © 2020 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 43 1. Check the signal strength or check whether the screen is normal when the external device is connected. 2. After measuring each voltage from power supply, finally replace the Main board. Copyright © 2020 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 44 Revised Content Connection diagram date As the part connecting to the external input, check the screen condition by signal Copyright © 2020 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 45 A. Video error_Color error symptom date Revised Check Link Cable(Vx1 or EPI/CEDS) Content date reconnection condition Check connect condition of the Link Cable, especially dust or misassembling. Copyright © 2020 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 46 Screen darkness to disconnection of the FFC cable pin. G color transient due to poor FFC cable CABLE G Color Excessive connection A - 1/11 Copyright © 2020 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 47 CABLE Color spread FFC connection problem CABLE Color spread FFC connection problem Due to foreign substance within CABLE Screen stop FFC PIN A - 2/11 Copyright © 2020 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 48 Main IC problem Main Dark picture Dark left-side screen Top/bottom screen part Main Broken picture Picture problem due to tuner Inner side quality problem A - 3/11 Copyright © 2020 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 49 Screen spread Screen corner appears blurry Main Color Spread Color spread on the screen Main Blurry Screen Blurry picture on the screen A - 4/11 Copyright © 2020 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 50 Screen picture spread problem Screen problem No problem at the initial stage. Right-side Main During Heat run, right-side picture picture problem problem A - 5/11 Copyright © 2020 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 51 BLU internal foreign matter inflow MODULE Internal matter 6 block image broken MODULE Image broken MODULE Image broken Screen sync signal broken A - 6/11 Copyright © 2020 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 52 BLU Vertical spreading on cube screen in no MODULE Vertical smear signal MODULE Over color Screen contour part brightly Over color A - 7/11 Copyright © 2020 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 53 Center of the screen 1 block dark MODULE Screen darkness MODULE Vertical bar Center Vertical Bar Darkness at the MODULE bottom of the MODULE internal BLU breakage screen A - 8/11 Copyright © 2020 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 54 T-Con is defective and the picture below T-CON image broken the screen is broken A - 9/11 Copyright © 2020 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 55 The entire screen is dark and bit noise T-CON Image Broken occurs The entire screen is dark and bit noise T-CON Image Broken occurs A - 10/11 Copyright © 2020 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 56 Appendix : Exchange Power Board (PSU) No Light No picture/Sound Ok A - 11/11 Copyright © 2020 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 57 Check Power Indicator in front date 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 58 Store mode : use Store 5. LED voltage Check : P801, LED B+ SK100 (AC input) Power Board is no problem if all the conditions are satisfied. Copyright © 2020 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 59 POWER OFF MODE checking method date 1. Press ‘IN START’ button of the Factory SVC Remote control. 2. Check the entry into ‘3. Power On/Off Status’. Copyright © 2020 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 60 1. Press the Setting button on the remote control 2. Select the Sound function of the Menu 3. Select the Sound Out 4. Select Internal TV Speaker Copyright © 2020 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 61 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. Copyright © 2020 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 62 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. Copyright © 2020 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 63 [ Wi-Fi/BT board : Rear ] LED_R +3.5V_ST KEY2 1. Check connect condition between Wi-Fi/BT board and Main board. 2. Check +3.5V_WIFI on the terminal 1, 6, 12. Copyright © 2020 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 64 Error Established E. Etc symptom date Revised Content How to use the Factory SVC Remote control date 1. How to access Factory SVC Remote control. Copyright © 2020 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 65 Digital EYE function ON/OFF For some Model, access to the Test Pattern TILT Used for screen tilting change (Access to the old PDP control mode) Copyright © 2020 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 66 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 to HDMI 1,2,3,4 DVI (Add function) Change to DVI Copyright © 2020 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 67 - 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 training and service purposes.
  • Page 68 You can view 9 types of patterns 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!) Copyright © 2020 LG Electronics. Inc. All rights reserved. Only for training and service purposes.

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