ViewSonic P90F Service Manual page 37

SECTION 6
Display is Horizontal. Line,
(No Vertical. output)
Pin 2 of I310 = 15V approx.
Pin4 of I310 = -15.V approx.
Check I301 AND
Peripheral CKT
ViewSonic Corporation
YES
I310 Pin1,Pin7
Input proper ?
NO
Are there output
at pin 3,5 of
I301 ?
NO
NO
Check SMPS DC
output
33
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P90f-1