ViewSonic P90F - Troubleshooting Section 2

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SECTION 2
Blank Screen LED Amber
Check pin 23,21of IA01
p
in17= Hi
g
h
,
p
in18= Low
Go to SECTION 1 SMPS
troubleshootin
g
chart
NO
Check by entering Preset
mode to obtain “No
No
Check signals from PC
YES
Check if XA01
waveform exist ?
NO
YES
Replace
MCU
(
IA01
)
YES
Check B+ (5V)
to IA01 exist ?
NO
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P90f-1