Service manual

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 (U5
and U1) by pushing
the power key or
re-plugging the DC
12V cable
Scalar (U5) Hangs
No
ReplaceU1
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
Q702 is 5V
Replace Q702
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
Picture
shows
Still no
Picture
No
No
Next
Replace U4
Yes
Check U4
No
Replace U009
Yes
Check U009
No
Yes
Replace U1
ReplaceU5
MASCOT V2
Still no
Picture
6. Trouble Shooting Flow Chart
ViewSonic Corporation
18
Confidential – Do Not Copy
VG500b