No Power - Main Pcba; Trouble Shooting Guide - LG 22LS2100 Service Manual

1. NO POWER-Main PCBA
NO POWER
1
Is Adapter
Output VOLTAGE 19.4V
through of JK700?
2
Is 3.3V at C771?
3
Is 5V at C716?
is 1.1V at C737?
4
Check wavef orm of X600
5
is 3.3V at 1pin of P200?
when push power key,
Is 0v at 4pin of P200?
6
is there any waver at 3pin of P200,
when use remote controller?
Insert F/W
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Only for training and service purposes
TROUBLE SHOOTING
YES
YES
YES
YES
YES
- 12 -
NO
check open or short at Line.
or change Adapter.
check the Lines of IC701,
NO
If there is any problem at Line,
check the Lines of IC704,IC706
NO
If there is any problem at Line,
Change IC704,IC706.
Check Line short or open between
NO
Change IC600 or change X600
NO
Or check Line short or open of P200
NO
Or check Line short or open of P200
4
X600
Change IC701
IC600 and X600,
Change control
change IR board
LGE Internal Use Only