Dell 1707FPc - No Picture (LED Is Orange)

Dell 1707FPc
54
No picture (LED is orange)
No picture
OK
OK
NG
NG
Measure U601 PIN2=3.3V
U602 PIN2=1.8V
Replace U601, U602
X301 oscillate waveforms are
normal
Replace X301
Check if the sync signal from
computer is output and video cable
is connected normally
Input the sync signal of
computer, or change the
cable
Replace U401
NG
OK