White Screen - Buffalo FTD-G731AS Service Manual

White screen

Check Correspondent
component
White screen
Measure Q204
base is high level?
OK NG
Check Q203 is broken
or CN503 solder?
NG
OK
Replace PANEL
Measure U202 PIN2=3.3V
U201 PIN2=2.5V
OK
X401 oscillate
waveform is normal
OK
Replace U401
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BUFFALO Service Manual
Check Correspondent
NG
component
NG
Check Correspondent
component