The projector was working one day & then it wouldn't.
I always had the unit left in stand-by mode.
Went to turn it on from the front and unit did not respond.
Tried the main power toggle switch nothing happened.
Changed Power Cord and outlet... no change.
Have pulled off casing, checked fuse with an ohm meter and have continuity. Have voltage into the unit.
Think I may have a bad power supply unit or circuit board.
Looking for factory trained Benq service center.
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unless you dropped it, there is no damage to the sensor. it might just be dirty. blow the dust out of the projector with canned air. if there is physical damage, just replace it. if you're sure the remote works but none of the sensors do, it's a main board problem.
Make 100% sure that your lampdoor is closed properly because there is a little swith on the lamp door that supplies the power to the mashine ( only when pushed in ) You'll see on the lamp door there is a pin that stands out - that pin pushed in the switch when the lampdoor is closed thus supplying power to rest of the components.
I had a similar problem with my Benq 8700+. The aspect ratio would show in the R low corner on changinbg resolutions, and would close down to a single line ("anamorphic" for example) which would remain on the screen. I checked the manual (useless) and went through all the set up screens (again useless). In despiration, I decided to try to unplug the projector and did so for 30 seconds to allow the charge to drain from the circuits powering the chips in the 8700+. Upon returning power and restarting, the screen resolution appears/disappears properly once again. Give thjis a try.