#Chinatv

CHINA TV 21"NORMAL PCB
MAIN IC 8873CSCNG 6PR6
EHT BSC25-T1010A
VERTICAL IC LA78040
SOUND IC TDA2003
STANDBY RELEASED
BUT TV NOT ON
1.Power on/Check SMPS output voltages----ok
2.Check voltage main ic pin No.64-------standby(3V)------ok.
3.Standby release by remote------pin 64 voltage(0V)----ok.
4.Check 8V main ic pin No.17--------nil.
5.Check 5V main ic pin No.36--------nil.
6.Check 5V main ic pin No.47--------nil.
7.Tracing from pin 64 to standby transister (C1815).
8.Check voltage-----standby transister collecter voltage missing.
9.Tracing from standby transister to 8V regulator transister(C8050)----base voltage missingC8050).
10.Tracing 5V regulator transister(C8050).
11.Check 8V transister collecter voltage-----ok.
12.Check 5v transister collecter voltage-----ok.
13.Check 8V regulator transister base voltage----missing.
14.Tracing from 8v regulator transister base to voltage source----pcb voltage source path damage or internally open.
15.Power off/check continuity this line-----no continuity.
16.Add a jumper.
17.Power on/Check 8v and 5V----ok.
18.Then-----