- BENQ DLP PROJECTOR SERVICE MANUAL

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No
5. Power board trouble shooting guide.
Power BD Check.
Check output
voltages.(1)+3.3V(2)
+12V(3)+5V (4)+5V -
Fix(5)+3.3V-Fix.
Short Pin12&Pin9.
Disconnect the wire
form buttom bd. to
power bd.
Fuse Broken ?
Proceed to "Prim ary
Circuit Check".
No +3.3V Output.
F704 Broken ?
Check +3.3V-Fix exists ?
Replace new fuse.
Yes
No
Yes
Yes
No
No
Proceed to "No +3.3V-
Fix output".
Q704 works norm ally ?
Check Q702,Q703,
and On/Off signal.
Check trace.
Yes
No
RS232 is OK?
Check R61,R62
Check U14
Check main board