Mine needed a "fan module" replaced. The part number is 60.J8613.011.
Cost was $60, plus $100 for labour.
It appears, this is most likely caused by a blown capacitor on the main board.
http://www.avsforum.com/avs-vb/showthread.php?t=1055274
Fans not working
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exact same problem...
Same problem. Have just sent BENQ an Email.
I have same problem. Did you hear back from BenQ?
I have a benq pb6200. The quiet fan hums and the lights on the control panel are lit up but the main fans and bulbs will not start.
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