Dell E178FPC - No Picture (LED Orange)

17" LCD Color Monitor Dell E178FPC
50
No picture (LED orange)
No picture
Measure U701 PIN2=3.3V
C702 “-”=1.8V
Replace U401
X401 oscillate
waveform is normal
Replace Q702, U702
OK
OK
OK
NG
Check HS/VS from
CN405 is normal
Replace X401
Check Correspondent
component
NG
NG
Replace U401
Whether the reset
of the Scalar IC is
useful?
Check C418, D414,
D415, R404
NG
OK