LG 22LN4000 Service Manual

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LGE Internal Use OnlyCopyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes
4. Abnormal screen (TV)-Main PCBA
wGGymG Gf
Abnormal screen (TV)
YES
NO
NO
insult RF cable tight and then
Cable nut screw tight.
1
Change Main PCBA
WAVEFORMS
pG\}GG\GG{|[WXf
2
pGpYjG G
hG]S^G G{|[WXf
3
4
pGpmG G G]^
S]_GGGpj]WWf
NO
NO
3
^wGG{|[WXG OzjsP
]wGG{|[WXG OzkhP
4
]^SG]_G Gpj]WW
If 4.9V is not at plus pin of L705, check
It is over 3V at 2pin of IC706,
if it is not, Check Line between IC706
and IC600 is open or short.
Another is change IC706
Check Line between TU401 and IC600
is open or short, Another is change
IC600 or TU401
Check Line between TU401 and IC600
is open or short, Another is change
IC600 or TU401

LG 22LN4000 Specifications

General

Brand	LG
Model	22LN4000
Category	LED TV
Language	English