ONIDA TV 21''ULTRA SLIM PCB.
FBT- BSC23-N0151/N0171.
SMD IC TDA11105H/N3/3/MB3.
VERTICAL IC UTC78040.
SOUND IC TDA7297SA.
STR G8656.
STANDBY PROBLEM.

1.Power on/Check EHT supply voltage--------ok.
2.Check H OUT collector voltage---------ok.
3.Check HDT input voltage---------ok.
4.Check 3.3V supply----------ok.
5.Check 5V regulator output supply---------missing.
6.Check 8V regulator output supply--------missing.
7.Check transistor Q905(A1273) collector voltage--------missing.
8.Check standby smd transistor Q904 base voltage-------abnormal.
9.Check memory ic supply voltage-------ok.
10.Check memory ic SCL voltage----ok.
11.Check memory ic SDA voltage--------low.
12.Power off/Check memory ic SCL pin registor------high registivity.
13.Check memory ic SDA pin registor-------ok.
14.Replace 100 ohms SCL pin registor.
15.Then---------

свернуть