ViewSonic PJ503D-1 - Page 92

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ViewSonic Corporation Confidential - Do Not Copy PJ503D-1
3. Power Trouble Shooting Guide
Power BD Check.
Check output 12V
Prepare Meter.
Disconnect the wire
form DC-DC bd. to
PFC bd.
Fuse Broken ?
Proceed to "Primary
Circuit Check".
No 12V or 5V or
2.5V Output.
TOPSwitch
Broken ?
B+=380VDC ?
Replace new
TOPSwitch
Yes
No
Yes
Yes
No
No
Proceed to " Primary
Circuit Check"
Lacks of some componets
around TOPSitch ?
Check Trace.
solder them.
Yes
No