ViewSonic Pro8400 Series VS13647 Service Manual page 30

Power Source Troubleshooting:
No Power
Source after
turning on
Check AC socket
and connector
OK
Check
Safety Switch
OK
Check LED and
keypad FFC
OK
Check 7 pin
Power output
OK
Replace
main board
ViewSonic Corporation
NG Replace AC
socket
NG
Replace power
board or reinstall
NG Replace keypad
and FFC
NG
Check
Fuse
OK
Replace
power board
Fan failure after
turning on
Check fan
connection
OK
Check
Fan
OK
Check
Main board
NG
Replace fuse
27
Confidential - Do Not Copy
NG Reconnect fan
NG Replace fan
NG
Replace
Main board
Pro8400