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No picture (LED is orange)
Measure U601 PIN2=3.3V
X301 oscillate waveforms are
normal
Check if the sync signal from
computer is output and video cable
is connected normally
No picture
U602 PIN2=1.8V
OK
NG
OK
NG
NG
OK
Replace U401
u5[Pb€ g /• D e™ • Q
Replace U601, U602
Replace X301
Input the sync signal of
computer, or change the
cable
55
Dell 1907FPc