#Lgtv
Автор: Cosmic Electronics
Загружено: 2019-10-27
Просмотров: 27339
LG TV 21"ULTRA slim PCB
Main IC TDA12155PS/N3/A/AL4
EHT BSC25-NO304
VERTICAL IC TDA4865AJ
SOUND IC TDA7297SA
AV IC LA7958N
WIDTH IC KIA4558P
STR W6554A
POWER PROBLEM
1.Power on/Led one time blink then off.
2.Power off/Discharge main filter condenser.
3.Power on/Check EHT supply voltage---- output condenser charge then automatically discharge.
4.Power off/Discharge main filter condenser.
5.Open supply voltage jumper.
6.Open series resister 91K.
7.Measure resisters----ok.
8.Next KIA431 open.
9.Set new KIA431.
10.Power on/Check EHT supply voltage---same result.
11.Power off/Open Optocupler.
12.set new Optocupler.
13.Power on/Check EHT supply voltage----same result.
14.power off/Check 12V supply line---ok.
15.Open condenser C826(2200/25V).
16.Set new condenser.
17.Then---------
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