ViewSonic Pro8400 Series VS13647 - Power Source Troubleshooting Flowchart

Power Source Troubleshooting:
No Power
Source after
turning on
Replace AC
socket
Replace power
board or reinstall
Replace keypad
and FFC
Replace
power board
Replace
main board
OK
OK
OK
OK
NG
NG
NG
NG
Check 7 pin
Power output
Check
Safety Switch
Check AC socket
and connector
Check LED and
keypad FFC
Fan failure after
turning on
Reconnect fan
Replace fan
Replace
Main board
NG
NG
NG
OK
OK
Check
Main board
Check
Fan
Check fan
connection
Check
Fuse
OK
Replace fuse
NG
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ViewSonic Corporation
Pro8400
27