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LG 49NANO85UNA Service Manual
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LG 49NANO85UNA Service Manual

Chassis : uax2a
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LED TV
SERVICE MANUAL
CHASSIS : UAX2A
MODEL : 49NANO85UNA
CAUTION
BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
P/NO : MFL71703901 (2001-REV00)
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.

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Summary of Contents for LG 49NANO85UNA

  • 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 SOFTWARE UPDATE ................9 BLOCK DIAGRAM ................. 10 EXPLODED VIEW .................. 11 ASSEMBLY / DISASSEMBLY GUIDE ........... 12 TROUBLE SHOOTING GUIDE ..........APPENDIX - 2 - Copyright © LG Electronics Inc. All rights reserved. Only for 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 for training and service purposes.
  • Page 4 - 4 - Copyright © LG Electronics Inc. All rights reserved. Only for 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 for training and service purposes.
  • Page 6 AV and DVI use same jack ; SPDIF out(1EA) Optical Audio out Rear (1EA), HeadPhone HeadPhone out USB Input EMF, DivX HD, For SVC (download) JPEG, MP3, DivX HD - 6 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 7 25.12 SDTV 480P 720*480 31.47 59.94 SDTV 480P 720*480 31.5 27.02 SDTV 480P 720*576 31.25 SDTV 576P 1280*720 44.96 59.94 74.17 HDTV 720P - 7 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 8 8K Model Only. 7680*4320 1188 8K Model Only. 7680*4320 2376 8K Model Only. 7680*4320 263.74 59.94 2376 8K Model Only. 7680*4320 2376 8K Model Only. - 8 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 9 (5) After finished the update, below Pop-up appear (6) Turn OFF the TV and On. Check the updated SW Version and Tool Option - 9 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 10 BLOCK DIAGRAM 1. Main IC - 10 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 11 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. - 11 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 12 (2) Disassemble B/C Screw (3) Prepare B/C remove after Checking the Module Holder Position. 65/55" Screw : 12ea Holder : 65/55” 8ea, 49” 6ea 49" - 12 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 13 (5) Right Side : Disassemble B/C Using Opener. Put the opener into the gap of guide panel and back cover and move upward. - 13 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 14 (6) Hold the center of the back cover as shown in the picture and slide it upwards. - 14 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 15 (3) Assemble the Screw of B/C. 65/55” Screw : 12ea Holder : 65/55” 8ea, 49” 6ea 49"” (4) Assemble Stand Screw.(65” 6ea , 55/49” 4ea) - 15 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 16 49inch 7ea Disassemble the source PCB from the guide (2) Disassemble of Guide panel screw UP/RIGHT/LEFT Tapping Screw(M2*L4) 65inch 18ea, 55inch 17ea, 49inch 15ea - 16 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 17 (3) Disassemble of Case Top screw. - Screw(M3*L4) 65inch 9ea, 55inch 7ea, 49inch 5ea - 17 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 18 Disassemble Hooks. (5) Disassemble Hooks. ( UP 2ea Left/Right each 1ea) About 350mm About 350mm (6) Panel and Guide Panel disassembly (using absorber) - 18 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 19 Screw(Powerlok type, M3*L5) 65inch 23ea, 55inch 14ea, 49inch 13ea The Guide of BLU/LCM assemble -> The module assembly can be performed in reverse disassembly order. - 19 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 20 TROUBLE SHOOTING GUIDE Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 21 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 22 ☞A4 & A2 Always check & record S/W Version and White Replace Main Board Re-enter 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 23 ☞A9 Check various Check and No Video/ voltages of Power Normal replace No audio Board (13.2V…) voltage? MAIN B/D Replace Power Board and repair parts Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 24 1. Reconnection 2. Install Booster S/W Upgrade Contact with signal distributor Normal or broadcaster (Cable or Air) Picture? Normal Picture? Replace Main B/D Close Close Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 25 Replace Main/T-con B/D Component device/Cable cable error normal Request repair for external device/cable Check external External HDMI device and Replace Main/T-con B/D device/Cable error cable normal Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 26 Normal (Check normal operation of HDMI/ Screen Main /T-con screen? External Input, Component, normal? RGB and HDMI/DVI by connecting Jig, pattern Generator ,Set-top Box etc. Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 27 Measure voltage of each output of Power B/D Normal? Normal Replace Main B/D voltage? Normal Close Check ST-BY 3.5V voltage? ☞A9 Replace Power B/D Replace Power Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 28 Normal Replace Main B/D Check Power B/D voltage? voltage ※ Caution Check and fix exterior Replace Power B/D of Power B/D Part Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 29 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 30 > Power Board Screen normal voltage Speaker off Cancel OFF Replace Power Board and repair parts Check Speaker Replace MAIN Board Disconnection disconnection Replace Speaker Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 31 (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 32 Replace Main B/D (Power B/D don’t have problem) If R/C operate, Normal Close 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 33 MR20 Close Down load the Firmware * If you conduct the loop at 3times, change the MR20. * INSTART MENU14.RF Remote control Test3. Firmware download Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 34 Voltage? 1pin Main B/D INSTART menu ☞A15 Close Check & Repair Wifi cable connection ☞A4 Wi-Fi Mac Close value is “NG”? Change the Wifi assy Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 35 Recognition error - S/W Version HDMI/ Check and fix DVI, Optical Replace Main B/D Fix in external device/cable Recognition accordance error with technical information Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 36 “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 37 Revised date Zoom part with Module Replace module exterior damage damage Cabinet Replace cabinet damage Remote Replace remote control control damage Stand Replace stand dent Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 38 Exchange Module (1) ~ (3) A-6/11 ~ A-8/11 Inverter/ Module Exchange T-Con (1) ~ (2) A-9/11 ~ 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 39 How to use the Service remote control A16-A18 Check items after Main B/D replacement E. Etc Adjustment Test pattern – ADJ Key Main Board JIG Point Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 40 Check Back Light On with naked eye Content date No Video/Normal audio R7802: 1.8V (정상) If the Black light LED assemble is ‘OK’, you can see the lights on each points. Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 41 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 © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 42 All settings  Programmes  Programme Tuning & settings  Manual Tuning When the signal is strong, use the attenuator (-10dB, -15dB, -20dB etc.) Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 43 Revised Version checking method Content date 1. Checking method for remote control for adjustment Version Press the IN-START with the remote control for adjustment Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 44 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 45 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 46 A. Video error_Color error symptom date Revised Content Check Link Cable(VX1/EPI) reconnection condition date Check the contact condition of the Link Cable, especially dust or mis insertion. Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 47 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 48 LVDS cable connection problem CABLE Color spread LVDS cable connection problem Due to foreign substance withi nLVDS CABLE Screen stop cable PIN A - 2/11 Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 49 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 50 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 51 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 52 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 53 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 54 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 55 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 56 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 57 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 58 Established B. Power error _No power symptom date Revised Content Check front Power Indicator date ST-BY condition: On or Off Power ON condition: Turn Off Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 59 - Normal condition : Not blank - Abnormal condition : Blank 1~9 times All condition meets, Power Board OK. All condition meets, Power Board OK. Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 60 POWER OFF MODE checking method date Entry method 1. Press the IN-START button of the remote control for adjustment. 2. Check the entry into adjustment item 3. Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 61 1. Press the Setting button on the remote control. 2. Select the Sound function of the Menu. 3. Select the Sound Out. 4. Select TV Speaker. Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 62 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 63 2. Check the standby 3.5V on the terminal (③). 3. AS checking the Pre-Amp(IR LED light), 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 64 Checking order to check motion remote/wifi MIC_CLK Checking order 1.Check BT/Wifi cable condition between BT/Wifi assy & Main board. 2.Check the 3.5V on the terminal 1 pin Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 65 Standard Repair Process Detail Technical Manual Error Established E. Etc symptom date Revised Content How to use the Service remote control date 1. How to access the remote control Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 66 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 67 Connects to external input 1,2,3 COMP1,2 (Added function) Connects to Component 1,2 HDMI1,2,3,4 Connects to HDMI 1,2,3,4 (Add function) DVI (Add function) Connects to DVI Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 68 - 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 69 You can view 11 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!) Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 70 Main Board / T-CON Voltage Check Point Content date +1.25V VTERM +D13.2V VCC18 +1.88V +5.69V VCOM1 +A13V +7.91V HVDD (20V) +16.61V +5.8V VCOM2 VGL1 -15V VGL2 +28V Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.