Troubleshooting – BenQ SP831 User Manual
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Troubleshooting
7. Troubleshooting
The projector does not turn on.
No picture
Blurred picture
Remote control does not work
The Temperature warning light is flashing red.
Cause
Remedy
There is no power from the power
cable.
Plug the power cord into the AC inlet on the
projector, and plug the power cord into the
power outlet. If the power outlet has a switch,
make sure that it is switched on.
Attempting to turn the projector on
again during the cooling process.
Wait until the cooling down process has
completed.
Cause
Remedy
The video source is not turned on or
connected correctly.
Turn the video source on and check that the
signal cable is connected correctly.
The projector is not correctly
connected to the input source device.
Check the connection.
The input source has not been
correctly selected.
Select the correct input source with the
SOURCE key on the projector or remote
control.
The lens cap is still attached to the
lens.
Remove the lens cap.
Cause
Remedy
The projection lens is not correctly
focused.
Adjust the focus of the lens using the focus
ring.
The projector and the screen are not
aligned properly.
Adjust the projection angle and direction as
well as the height of the unit if necessary.
The lens cap is still attached to the
lens.
Remove the lens cap.
Cause
Remedy
The batteries are out of power.
Replace the batteries with new ones.
There is an obstacle between the
remote control and the projector.
Remove the obstacle.
You are too far away from the
projector.
Stand within 6 meters (19.5 feet) of the
projector.
Cause
Remedy
The internal temperature is too high or
the fans are not working.
Turn the projector off and contact qualified
service personnel for further help. See
for details.