BenQ PB6100 Both back fans not working, and the bulb not turning on.

found a bulging capacitor where he suggested to look.
I soldered in a new one from Radio Shack ($1.50) and the projector works again.
PB6200 symptoms: Back fans were not working Bulb won't light (but is in perfect condition) LEDs on control buttons are lit, but not three status LEDs Smaller internal fan will not turn off.

Solution:
The mainboard had a bad capacitor The board is the one where all 3 fans are connected, and which is facing upside down on top of the powerboard.
The bad capacitor on my projector was a 25V 470uf 10mm diameter, 16mm high, 5mm lead spacing capacitor.

"I recommend you to open your projector, unplug all connections to the fan board, turn it upside, and inspect the capacitors and other components. Bad capacitors have a bulge and/or a black stain or fluid coming out on the top."

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I fixed the exact same problem on my PB6200. Both back fans were not working, and the bulb would not turn on.

In my projector, the fan board had a bad capacitor. The fan board is the one where all 3 fans are connected, and which is facing upside down on top of the powerboard. The bad capacitor on my projector was coded C7302 on the schematics. It's a brown, 25v 470uf capacitor.

I recommend you to open your projector, unplug all connections to the fan board, turn it upside, and inspect the capacitors and other components. Bad capacitors have a bulge and/or a black stain or fluid coming out on the top. You can find pictures on the net.