LG 75UM6970PUB Service Manual

Chassis ua93y

Hide thumbs Also See for 75UM6970PUB:

Owner's manual (76 pages)

Owner's manual (39 pages)

Owner's manual (73 pages)

LED TV

SERVICE MANUAL

CHASSIS : UA93Y

MODEL : 75UM6970PUB

MODEL :

CAUTION

BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.

P/NO : MFL71442726 (1906-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.

75UM7100PUA

CONFIDENTIAL

Table of Contents

Summary of Contents for LG 75UM6970PUB

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 ................. 12 EXPLODED VIEW .................. 13 DISASSEMBLY ..................14 TROUBLE SHOOTING GUIDE ..........APPENDIX - 2 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 3: Safety Precautions
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 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: Application Range
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 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 - 7 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 8 4096*2160 53.95 23.98 296.7 UDTV 2160P 4096*2160 UDTV 2160P 4096*2160 56.25 UDTV 2160P 4096*2160 61.43 29.97 296.7 UDTV 2160P 4096*2160 67.5 UDTV 2160P - 8 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 9: Component Input
HDTV 1080I 1920*1080 33.75 74.25 HDTV 1080I 1920*1080 56.25 148.5 HDTV 1080P 1920*1080 67.43 59.94 148.5 HDTV 1080P 1920*1080 67.5 148.5 HDTV 1080P - 9 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 10: Software Update
(7) Click [Yes] : TV will be DC OFF -> ON automatically (8) After TV turned on, Check the updated SW Version and Tool Option - 10 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 11 (5) [After finished the update, below Pop-up appear version (6) Turn OFF the TV and On. Check the updated SW Version (3) Click [DOWNLOAD AND INSTALL] and Tool Option - 11 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 13 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. - 13 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 15 Insert the screwdriver into the hole and remove it by tilting it in the direction of the arrow. * Please use the driver with a diameter of 4.5mm or less. - 15 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 16 (2)MAIN P2900 -> MODULE “B” (3)MAIN P7600 -> MODULE “A” (4)MAIN P1001 -> POWER P201 (5)MAIN P5800 -> SPEAKER “C” -> SPEAKER “D” Unlock the screw. - 16 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 17 Speaker Speaker Insulation Sheet Detach insulation sheet from module. Do remove the bracket after remove the screw. - 17 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 19 (Step 4) Case Top Screw disassemble (side screw) and Case Top disassemble * top 10ea / side L 6ea / side R 6ea / down 10ea - 19 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 20 (Step 7) Optical Sheet disassemble ((DS, Prism on Prism, DP) (Step 8) DPS, LED Fixer disassemble & Reflector Sheet disassemble * rotate DPS (16ea) * push LED fixer in back (5ea) - 20 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 21 2) Press the LED Array on the surface of Cover Bottom. 3) Connect the CNT to the LED Array. * Finish the Attached LED Array (4ea) - 21 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 26 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 © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 27 ☞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 © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 28 ☞A18 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 © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 29 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 © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 30 /Cable device and error normal cable Request repair for external device/cable Check external External device device and Replace Main/T-con B/D HDMI /Cable cable error normal Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 31 Replace screen? Screen (Check normal operation of Main /T-con External Input, Component, normal? RGB and HDMI/DVI by connecting Jig, pattern Generator ,Set-top Box etc. Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 32 Measure voltage of each output of Power B/D Normal? Normal Replace Main B/D voltage? Normal Close Check ST-BY 3.5V voltage? ☞A18 Replace Power B/D Replace Power Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 33 Replace Main B/D Normal? Abnormal Check for all 2- phase Replace Power B/D power out Abnormal Fix A/C cord & Outlet and check each 2 phase out Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 34 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 © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 35 13.2V of Power Screen normal voltage Speaker off Board Cancel OFF Replace Power Board and repair parts Check Replace MAIN Board Disconnection Speaker disconnection Replace Speaker Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 36 (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 © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 37 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 © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 38 RF Receiver ver Close is “00.00”? Replace MR19 Close Change the RF Receiver assy * If you conduct the loop at 3times, change the M4. Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 39 INSTART menu Voltage? 1pin Main B/D ☞A24 Close Check & Repair Wifi cable connection ☞A4 Wi-Fi Mac value is “NG”? Close Change the Wifi assy Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 40 Recognition error - S/W Version HDMI/ Check and fix DVI, Optical Replace Main B/D Fix in external device/cable Recognition error accordance with technical information Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 41 “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 © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 42 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 © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 43 Exchange Module (1) ~ (3) Inverter/ Module A-8/11 A-9/11 ~ Only using Exchange T-Con (1) ~ (2) T-con model A-10/11 Exchange Power Board(PSU) A-11/11 Continue to the next page Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 44 Check items after Main B/D replacement E. Etc Adjustment Test pattern – ADJ Key How to use JIG (Power B/D Diganostic Smart Jig Multi Gender Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 45 Check LCD back light with naked eye Content date After turning on the power and disassembling the case, check with the naked eye, whether you can see light from locations. Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 46 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 © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 47 All Setting  Programmes  Programme Tuning & Settings  Manual Tuning All Settings When the signal is strong, use the attenuator (-10dB, - 15dB, -20dB etc.) Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 48 Version checking method Content date <ALL MODELS> 1. Checking method for remote control for adjustment Version Press the IN-START with the remote control for adjustment Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 49 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 © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 50 Revised Content connection diagram (1) date <ALL MODELS> As the part connecting to the external input, check the screen condition by signal Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 51 A. Video error_Color error symptom date Revised Content Check Link Cable(EPI) reconnection condition date Check the contact condition of the Link Cable, especially dust or mis insertion. Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 52 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 © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 53 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 © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 54 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 © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 55 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 © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 56 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 © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 57 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 © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 58 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 © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 59 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 © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 61 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 © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 63 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 © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 64 5. LED voltage Check : P801, Pin 1-7 Picture Condition : VIVID (Back light 100) SK100 (AC input) 273.6V 334.4V all condition meets, Power Board OK. Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 65 Picture Condition : VIVID (Back light 100) 전압 SK100 (AC input) 183.6 224.4 LED 1+ LED 2+ 123.3 150.7 all condition meets, Power Board OK. Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 66 POWER OFF MODE checking method date <ALL MODELS> Entry method 1. Press the IN-START button of the remote control for adjustment 2. Check the entry into adjustment item 3 Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 67 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 © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 68 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 © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 69 2.Check the standby 3.5V on the terminal 6 pin (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 © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 70 Checking order to check motion remote/wifi KEY1 Checking order 1.Check BT/Wifi cable condition between BT/Wifi assy & Main board. 2.Check the 3.5V on the terminal 22 Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 71 Standard Repair Process Detail Technical Manual Error Established D. Function error symptom date Revised Content How to use the Service remote control date 1. How to access the remote control Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 72 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 © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 73 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 © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 74 - 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 © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 75 You can view 9 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 © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 77: Main Board
24 Marking Check UK74,UK75 28Pin 28Pin 12Pin 12Pin 28Pin UK77,UK78 Cable Connection SK79 Includes 49UJ63 SM80/SM86 16/18Y/19Y 17Y/18Y 16Y/17Y 16Y/17Y/18Y/19Y (UH) (UH/SJ) (SJ/UJ/UK/SK) (UH/UK/UM (LH/LJ/LK/LM) Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 78 UJ65/UJ68, UJ63/UJ67 LJ61/LJ68, LJ55/LJ58 SK80/SK85/SK95 UK78/UK75/UK77/SK79 ‘18 UK63/UK64/UK65/UK68/UK7050 LK57, 32/43/49LK54, 32LK61/62, 43/49LK61 ‘18 OLED B8, C8, E8, G8, W8 SM80/SM85/SM86 ‘19 UM73/UM74/UM75/UM76/UM79/UM80 LM57/LM63 ‘19 OLED B9/C9/E9/W9 Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 79 ▶ Power Board Muitl Gender JIG “A: 2013 LCD POWER” 2014 ▶ Connect the Muiti Gender to the connector (black) as shown in picture 2 of the Smart JIG. Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 80 - 20V Power Board : Change the switch to 24V of Smart Jig Voltage - 13.2V/18V Power Board : Change the switch to 24V of Smart Jig Voltage Power B/D Smart Jig Voltage Switch 13.2V/18V Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 81 ▶ Fix the LCD MODEL switch to 24V.(Smart JIG) ▶ Disconnect the Main Board 24Pin Power Cable connector. ▶ Connect the 24Pin Power Cable connector to the Muitl Gender JIG 24Pin connector Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 82 ▶ When the OK LED(24V,12V) turns on, Power Board is normal. ▶ When the NG LED turns on, the Power Board can be judged as defective. Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 83 ▶ When the OK LED(24V,12V) turns on, Power Board is normal. ▶ When the NG LED turns on, the Power Board can be judged as defective. Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 84 ▶ When the OK LED(24V,12V) turns on, Power Board is normal. ▶ Connect the 24Pin Power Cable connector to the Muitl Gender JIG 24Pin connector Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 85 ▶ Connect the 24Pin Power Cable connector to the Muitl Gender JIG 24Pin connector ▶ When the NG LED turns on, the Power Board can be judged as defective. Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 86 ▶ Connect the 24Pin Power Cable connector to the Muitl Gender JIG 24Pin connector ▶ When the NG LED turns on, the Power Board can be judged as defective. Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 87 ▶ When the NG LED turns on, the Power Board ▶ Fix the LCD MODEL switch to 20V.(Smart JIG) can be judged as defective. Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 88 ▶ When the NG LED turns on, the Power Board ▶ Fix the LCD MODEL switch to 20V.(Smart JIG) can be judged as defective. Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 89 ▶ Connect the 18Pin Power Cable connector to the Muitl Gender JIG 24Pin connector ▶ When the NG LED turns on, the Power Board can be judged as defective. Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 90 ▶ Connect the 28Pin Power Cable connector to the Muitl Gender JIG 28Pin connector ▶ When the NG LED turns on, the Power Board can be judged as defective. Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 91 ▶ Connect the 28Pin Power Cable connector to the Muitl Gender JIG 28Pin connector ▶ When the NG LED turns on, the Power Board can be judged as defective. Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 92 ▶ Connect the 12Pin Power Cable connector to the Muitl Gender JIG 12Pin connector ▶ When the NG LED turns on, the Power Board can be judged as defective. Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 93 ▶ Connect the 12Pin Power Cable connector to the Muitl Gender JIG 24Pin connector ▶ When the NG LED turns on, the Power Board can be judged as defective. Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 94 ▶ Connect the 28Pin Power Cable connector to the Muitl Gender JIG 28Pin connector ▶ When the NG LED turns on, the Power Board can be judged as defective. Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.

This manual is also suitable for:

75um7100pua

LG 75UM6970PUB Service Manual

Table of Contents

Summary of Contents for LG 75UM6970PUB

Page 3: Safety Precautions

Page 4: Servicing Precautions

Page 6: Application Range

Page 9: Component Input

Page 10: Software Update

Page 12: Block Diagram

Page 22: Troubleshooting Guide

Page 24: Main Pcb Assy

Page 77: Main Board

This manual is also suitable for:

LG 75UM6970PUB Service Manual

Table of Contents

Related Manuals for LG 75UM6970PUB

Summary of Contents for LG 75UM6970PUB

This manual is also suitable for:

Table of Contents