LG TV 20"NORMAL PCB
MAIN IC TDA9370PS/N3/A/1747
EHT 6174V-6002K
VERTICAL IC LA7840
SOUND IC TDA7297
AUDIO PROSSESOR TDA9859
VIDEO IC TDA6107JF
STR F6654
NO EHT PROBLEM
1.Power on/Check eht supply voltage-----ok.
2.Check H OUT collector voltage-----ok.
3.Check driver transister collector voltage------ok.
4.Check video output supply voltage----no genarate.
5.Check 5V regulator input and output voltage------low.
6.Tracing 5V regulator source voltage----10V charge condensor defective(1000mf/16V).
7.Add 1000mf/25V condensor.
8.Power on/Check 10V-----ok.
9.Check 8V-----ok.
10.Then-------
8 сен 2024