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YOU NEED TO REPAIR / REPLACE THE MAIN BOARD.
THE SUPPLY TO THE LCD PANEL CIRCUIT BLOCK MAY BE DEAD.
CHECK THE POWER SOURCE TO IT .WNA200 - SHARP CHIP FOR DEAD FUNCTION.
THIS SHOULD CURE THE PROBLEM , ELSE YOU MAY HAVE TO REPLACE THE BOARD!
the most inexpensive thing to change would be the power input board, which is what the plug plugs into, if that isn't the problem, you can look at the glass fuse on the power supply next to the input board to see if it is blown. if it is the fuse then the power supply needs to be replaced unless you know someone to desolder and resolder a thru hole fuse. Also, make sure the lamp door is shut properly. If the door doesn't push the safety switch in it will not complete the cicuit to allow power to the projector.
I had the exact same problem, I followed the advice of Victorbello on this site, and found a bulging capacitor where he suggested to look. Read where below.
I soldered in a new one from Radio Shack ($1.50) and the projector works again.
Back fans were not working
Bulb won't light (but is in perfect condition)
LEDs on control light, but not three status LEDs
Internal fan will not turn off.
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."
the power supply on that model seem to go bad after a while. the caps aren't properly reted it's power needs. they dry up. if you are good at soldering, replace c1 on the board (big cap) with a cap that has a slightly higher voltage rating. or replace the whole power supply. you might not be able to get one from nec, but you can try www.projectordoctor.com
if the status light is flashing .5 seconds on and 2.5 seconds off - you need to replace the lamp cover correctly.
if the status light is flashing .5 seconds on and .5 seconds off in 2 - 6 cycles the error is:
2 cycles - the projector is overheated. Move the projector to a cooler location, or/and remove dust in the light path.
3 cycles - the power unit is not working correctly.
4 cycles - the fans are not working correctly
5 cycles - lamp fails to light. Wait a full minute and then turn on again.
Main line fuse is on the board where the ac cord plugs.
The caps in the power supply usually leak and explode after 5 years, blowing the fuse. Solution is to replace the power supply and lamp ballast boards. Expensive repair.
the caps dry out. look for bulging caps. you won't find a schematic for the ps boards. infocus had someone else make them. the problem seems more like a overheating issue. as for the other one with the "just the fans", check the colorwheel.