Рет қаралды 13,540
CHINA TV 14"NORMAL PCB
MAIN IC 8895CSNG 7DN5
EHT BSC24-01N4014K
BSC25-T1010A
VERTICAL IC LA78040
SOUND ICTDA2003
TRANSISTOR POWER
1.Power on/Check H OUT transistor collector voltage-----ok.
2.Check driver transistor collector voltage----ok.
3.When power on then power LED glowing---then off,that means set standby release.
4.Check 8V pin No.17-------ok.
5.Check 5V pin No.47-------low.
6.Check 5V pin No.36------low.
7.Power off/Check ohms in 5V pcb line----low ohms.
8.Open pin No.47 from pcb.
9.Open pin No.36 from pcb.
10.Open tuner supply.
11.Measure ohms pin No.47-------high.
12.Measure ohms pin No.36--------low.
13.Measure ohms tuner supply----high.
14.As a result main ic pin No.36 low ohms.that means main ic defective.
15.Open main ic 8895CSNG 7DN5.
16.Then------