Samsung sf150t Service Manual page 20

6-2-3 No + 24 V
Start
Check
Y
OVP operation
N
Restart
6-2-4 + 24 V TPH Doesn't output
Start
End
SF150T
N
output shorted ?
Y
Remove short
Y
Q3 OK ?
N
Replace Q3
Check
N
C/S port short ?
Y
Remove short
D3 Open or N
Shorted ?
Y
Replace D3
Check CON1
Y
Q5 OK ?
N
Replace Q5
Troubleshooting
OVP operation
End
Check CON1
6-5