ViewSonic A90f+-1 VCDTS23307-2R Service Manual page 36

SECTION 6
Horizontal Line (No
Vertical output)
Check P401 DY connector
Pin 2 of I310 = 15 V approx.
Pin4 of I310 = -15 V approx
I310 Pin1,Pin7
Input proper ?
Are there output
at pin 3,5 of
Check I301 AND
Peripheral CKT
ViewSonic Corporation
YES
YES
NO
I301 ?
NO
.
NO
Check I310, short?
Check S.M.P.S. DC
output.
33
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A90f+-1