Trouble Shooting Flow Chart - ViewSonic VG500-2 VLCDS24349-2W Service Manual

6. Trouble Shooting Flow Chart

Reset the Scaling IC
Picture
(U005 and U001) by
shows
pushing the power
key or re-plugging the
DC 12V cable
Scaling IC (U005)
Hangs
End
ReplaceU001
ReplaceU005
MASCOT V2
ViewSonic Corporation
No picture Appear
Does the LED
light up
No
LED display is
Next
amber
No
Is it entering into
power saving mode
Restart PC signal
to ensure H. V.
Still no
sync are not
Picture
Still no
Picture
End
No
The Voltage across
C801 is 12V
Yes
Check O/P of U801 at
Yes
The Voltage at
L802 O/P is 5V
Yes
absent
The Voltage across
Q702 is 5V
End
Check U004
23
Confidential – Do Not Copy
No
Yes
No
pin10
pin7,
Yes
No
Yes
No
Yes
No
Yes
No
Check U009
Yes
Replace U001
Replace F801
Replace U801
Replace U802
Replace Q702
Replace U004
Replace U009
VG500-2