LG 55UB850T Service Manual

Established
date
Standard Repair Process
Revised date
1/16
LCD TV
Error
symptom
A. Video error
No video/ Normal audio
2013.01.31
Revised
date
1/16
No
video/
Normal
audio
First of all, Check whether all of cables between board is inserted properly or not.
(Main B/D↔ Power B/D, LVDS Cable, Speaker Cable, IR B/D Cable,,,)
Normal
audio
Y
No video
Normal audio
Check Back Light
On with naked eye
On
Y
Check Power
Board
24V, 12V,3.5V etc.
Normal
voltage
Y
Replace T-con/Main
Board or module
And Adjust VCOM
☞A18☞A1
N
Move to No
video/No audio
N
N
Repair Power
Board or parts
Check Power Board 24V output
☞A18
Normal
voltage
Y
Replace Inverter
or module
N
End
Repair Power
Board or parts
Always check & record S/W Version and White
※Precaution
☞A4 & A2
Always
check
&
record
S/W
Version
and
White
Balance value before replacing the Main Board
Replace Main Board
Re-enter White Balance value
1
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Only for training and service purposes
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LG 55UB850T Specifications

General

Screen shape	Flat
Response time	- ms
Display diagonal	55 \
Display brightness	- cd/m²
Display technology	LED
Native aspect ratio	16:9
Screen format adjustments	4:3, 16:9
Motion interpolation technology	UCI (Ultra Clarity Index) 1000
Tuner type	Analog & digital
Analog signal format system	-
Digital signal format system	DVB-T2
Noise reduction	Yes
Picture processing technology	LG Triple XD Engine
Smart modes	Cinema, Game, Photo, Sports, Standard, Vivid
Lifestyle apps	Skype
User memory	3.9 GB
3D glasses quantity	4
Supported file systems	NTFS
Supported 3D technologies	FPR 3D
RMS rated power	20 W
Programming period	8 day(s)
AC input voltage	100 - 240 V
AC input frequency	50 - 60 Hz
Power consumption (standby)	0.3 W
DVI port	No
DVI-D ports quantity	0
USB 2.0 ports quantity	2
USB 3.2 Gen 1 (3.1 Gen 1) Type-A ports quantity	1
Product color	Black, Metallic

Weight and Dimensions

Weight (without stand)	- g