SOURCE: BenQ pe8700 projector ir sensor replace or repair
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.
SOURCE: How do I replace the cooling fan in benq pe8700
There's more then one fan inside the projector. I think I counted 3 when I opened mine up. Two are easy to get to, the other is underneath. on theleft side looking from the front. You have to take off the back surround cover in onder to remove the top cover. The top cover slides back and lifts up. Be careful because there's a wire harness running to the top cover control panel. Disconnect it then you have access to the fans. Wish mine was that easy to repair.
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