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It could be a number of issues including clogged cooling channel, bad cooling fans, or an issue with the power supply to name a couple issues. What color and frequency does the warning light blink with?
Before I changed a lamp (expensive) I would try these techniques:
Clean the fan filter under the unit. It is little porous pad under a vent. Vacuum it or Wash it, let it dry THOROUGH:LY replace it with a factory filter, or make a new one out of garden variety air conditioner filter material. Reseat the filter and the cover.
Plug in power cord.
Restart projector. Hold down "on" button and see if it lamps up. If not, press "off" button and attempt to restart. It might have gone into a thermal shut down mode due to a clogged fan filter. I do a/v presentations and have encountered these issues on the road and I always try this simple fix first. I also always carry a spare projector.
either the lamp's seams aren't taped over with foil tape to prevent the premature shutdown due to the heat sensors being triggered, or the fan under the the colorwheel has stopped, maybe due to a piece of lamp from a previous lamp explosion being stuck in it, or the power supply/ballast is bad, or the eca on the engine itself is bad. The lamp is the easiest to try first. There should be foil tape over the seam on the side of the lamp you can't see when it is installed. If this doesn't work, take the front bezel off amd get where you can see the fan under the colorwheel and tunnel and power the unit up and see if the fan comes on. If it does thenthe eca on the engine or the power supply ballast is most likely bad and these are major repairs.
There are instructions to replace the lamp in the user's manual. The light comes up but if the lamp has now already several hours of use the resistance of the lamp increases and shut down the power supply of the lamp. Second, the lamp power supply could be bad too, but lets be optimistic and just replace the lamp first.
Not sure if this helps with the 7200 bu had a 4805 with a failed fan issue. There are two fans inthe unit, one smaller one that cools the color (colour) wheel and the larger one that cools the lamp. This unit had a problem with the larger lamp fan not turning. Unplugged and disassembled the unit to get the fan out and tested the fan using a 9v battery and a couple of wires (best to uplug the fan from the controller board so you are not forcing voltage into the unpowered controller board... that said, I did it hooked up just peeling back the label in the centre of the fan and touching the wires to the solder contacts) The fan worked fine so figured the controller board was the issue, so this wasn't going to be a simple "buy a new fan" issue.
Here is where your mileage may vary...
I decided that it would be OK to just run the fan. Unplugged the fan and powered it from the 9V battery and assembled the unit and powered it up. Found that there was 7v available on the power board at the second pin that was alwasy on when the power switch was on (thats the positive 7 V pin, but measure it with a meter since we are talking about a different projector) and just wired the fan direct to pin 1 and 2 (1 is ground on the 4805, 2 is +7V) and so now whenever the main power is on the fan runs, so after ti cools down I just power off the main power when not in use... or let the fan run if the noise isn't an issue. Crude but effective fix.
Hi, we had the same problem... Bought a new lamp and then encountered
the power light blinking repeatedly problem. After much frustration and
anquish, we finally got it to work again... The way I did it was, take
out the power cord from the back, then hold down the power switch and
re-insert the cord. Somehow it made a difference to the unit and it
powered back up all fine.. Cos we heard the fan come to life properly.
Cant guarantee it'll work for everyone but give it a try all the same.