#Chinatv

CHINA TV 14"NORMAL PCB
MAIN IC 8873CSCNG 6PR6
EHT BSC25-T1010A
VERTICAL IC LA78040
SOUND IC TDA2003
STANDBY PROBLEM
1.Power on/Check eht supply voltage-------ok.
2.Check driver transistor collector voltage------ok.
3.Check memory ic supply voltage-----low.
4.Power off/Open memory ic supply pin.
5.Power on/Check 5V supply voltage----low.
6.Tracing the 5V source supply
------trace 5v supply transistor V556(C1815).
7.Check transistor by meter------suspect it defective.
8.Open the transistor two points------Again measure transistor-----ok.
9.Resolder the transistor,C1815 not defective.
10.Check zener diode VD504(5.1V)-------suspect short.
11.Open the zener diode 5.1V.
12.Measure zener diode 5.1V------100% short----defective.
13.Set new zener diode 5.1V.
14.Then------