#Chinatv

CHINA TV 14"NORMAL PCB
MAIN IC 8895CSNG 7DN5/8895CSNG 7GG9
EHT BSC25-T1010A
VERTICAL IC LA78040
SOUND IC TDA2003
TRANSISTOR POWER
STANDBY PROBLEM
1.Power on/Check eht supply voltage---ok.
2.Check h out transistor collector voltage------ok.
3.Check horizontal driver supply voltage-----ok.
4.Check video output supply voltage----No genarate +180v
5.Check memory ic supply voltage---low.
6.Power off/Check ohms between supply and ground(memory ic)---low.
7.Open 5V supply three point from pcb.
a)Memory ic supply pin No.8(5V).
b)Main ic pin No.55(5V).
c)Main ic pin No.9(5V).
8.Check ohms memory ic supply pin----No reading(No short memory ic).
9.Check ohms main ic pin No. 55------High(No short this pin).
10.Check ohms main ic pin No.9-------low(Internally short this pin).
11.Main ic defective confirm.
12.open main ic,this ic defective.(8895CSNG 7DN5).
13.Substitude ic 8895CSNG 7GG9.Set this new ic.
14.Power on/Check memory ic supply voltage----ok.
15.Then-----