Dell E177FPc Service Manual page 38

17" LCD Color Monitor
HS/VS of input is normal
Measure U701 PIN2= 3.3V
X401 oscillating waveform is normal
If voltage of U403 PIN5/6 is normal
No video, LED orange
OK
U702 PIN2= 1.8V
OK
OK
OK
Replace U402
NG
Replace U401
NG
Check signal cable,
D409, D408
NG
Check U701, U702,
D704
NG
Check X401, C427, C428
NG
38
Dell E177FPc
Replace U403