ViewSonic VP720B Service Manual - Page 46
Trouble Shooting Flow Chart
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6. Trouble Shooting Flow Chart START CHECK MAIN BOARD 5V OK ? Y 3.3V OK? Y 1.8V OK? Y 2.5V OK? N CHECK POWER BOARD OK? N CHECK I102, SUROUND CAP BEAD OK? N CHECK I101 SUROUND CAP BEAD OK ? N CHECK I105, SUROUND CAP BEAD OK ? CHECK P101 AND ROUND CAP OK? CHECK I102 3.3V UROUND CAP OK ? CHECK I101 1.8V UROUND CAP OK ? CHECK I105 2.5V UROUND CAP OK ? ViewSonic Corporation Confidential - Do Not Copy 43 VP720-1_VP720b-1
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6. Trouble Shooting Flow Chart
START
CHECK
MAIN BOARD
5V OK ?
3.3V
OK?
1.8V
OK?
2.5V
OK?
CHECK POWER
BOARD OK?
CHECK I102,
SUROUND CAP
BEAD OK?
CHECK I101
SUROUND CAP
BEAD OK ?
CHECK I105,
SUROUND CAP
BEAD OK ?
CHECK P101 AND
ROUND CAP OK?
CHECK I102 3.3V
UROUND CAP
OK ?
CHECK I101 1.8V
UROUND CAP
OK ?
CHECK I105 2.5V
UROUND CAP
OK ?
N
N
N
N
Y
Y
Y
ViewSonic Corporation
Confidential – Do Not Copy
VP720-1_VP720b-1
43