LG OLED77C3 Series User Manual

Standard Repair Process
Established
date
Revised date
Error
symptom
Normal
audio
Y
N
Move to No
video/No audio
No video
Normal audio
Check Back Light
On with naked eye
On
Y
N
Check Power Board
2-V,12V etc.
Normal
voltage
Y
N
Replace T-con/Main
Board or module
Repair Power
Board or parts
Check Power Board 20V output
Normal
voltage
Y
Replace Inverter
or module
N
Repair Power
Board or parts
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
No video/ Normal audio
☞A9☞A1
☞A9
☞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 Cable, Speaker Cable, IR B/D Cable,,,)
1
A. Video error
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Only for training and service purposes.

LG OLED77C3 Series Specifications

General

Screen Size	77 inches
Display Technology	OLED
HDR	Dolby Vision, HDR10, HLG
Smart TV Platform	webOS
HDMI Ports	4
Audio Output	40W
Voice Assistant	Google Assistant, Amazon Alexa
Refresh Rate	120 Hz
Processor	α9 Gen6 AI Processor 4K
VRR	Yes
USB Ports	3
Resolution	3840 x 2160
Bluetooth	Yes
Wi-Fi	Yes