SAMSUNG 21"ULTRA SLIM PCB.
MAIN IC TDA12135PS/N3/3.
EHT AA26-00317A.
VERTICAL IC LA78045.
SOUND IC TDA7297SA.
STR POWER.
EHT SUPPLY LOW.

Solution:
1.Power on/Check eht supply voltage-----low.
2.Power off/Open eht supply coil.
3.Power on/Check eht supply-----high.
4.Power off/Add 100W lamp to eht supply.
5.Power on/Again check eht supply voltage------low.
6.Power off/Open IC KIA431.
7.Set new KIA431.
8.Power on/Check eht supply-----low.
9.Power off/Open optocuplor(817) and set new optocuplor.
10.Power on/Again check eht supply---low(same result).
11.Power off/IC KIA431 and optocuplor is ok.
12.Open transister Q806(2SC1815).
13.Set new 2SC1815.
14.Power on/Again check eht supply voltage-----ok.
15.Then--------