![background image](http://html1.mh-extra.com/html/viewsonic/vg500b-1/vg500b-1_service-manual_1021189013.webp)
No picture Appear
Does the LED
light up
LED display is
amber
Is it entering into
power saving mode
Restart PC signal
to ensure H. V.
sync are not
absent
End
Reset the Scalar
(U400)+U401 by
pushing the power
key or re-plugging the
DC 12V cable
Scalar(U400) Hangs
No
ReplaceU401
End
End
The Voltage across
C801 is 12V
Replace F801
Check O/P of U801
at pin7, pin10
Replace U801
The Voltage at
L802 O/P is 5V
Replace U802
The Voltage across
D802 is 5V
Replace F802
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
Picture
shows
Still no
Picture
No
No
Next
Replace U300
Yes
Check U300
No
Replace U301
Yes
Check U301
No
Yes
Replace U401
ReplaceU400
(gm2115)
Still no
Picture
5
.
TROUBLESHOOTING FLOW CHART
ViewSonic Corporation
10
VG500b-1
Confidential
– Do Not Copy
Summary of Contents for VG500b-1
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