Check your fans, sounds like a thermal shutdown. The fans are 12vdc with a sense line. Red and black power, blue is the sense line. disconnect the fan connector and check the fan with a 12vdc supply. then check the sense line for signal feedback.
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Replace the lamp. The lights flashing will also indicate what is wrong. Watch how they flash. Go to the manufacturers website and they way they are flashing indicates what is wrong (ex. 3 quick flashes, long continuous flashes...etc.) When you change the lamp reset the lamp counter in the menu and clean or replace the dust filters as well.
The ambient temperature in the room is to high. Try lowering the room temperature. If that doesn't work get a small fan and place it near the projector to provide extra cooling. The projector is running border line on high temperature and just needs a little extra cooling.
The lamp reset...should only be used when you replace the lamp..with a new one...The reset will start the clock running on the number of hours the new bulb has used..
if the fans don't turn on, they may be bad and needs replacing or rewired. if the fans turn on but not the lamp, the colorwheel may be bad (listen for a high-pitched whir when you switch it on. if no whir, replace the colorwheel). if the colorwheel is ok, replace the lamp.
if the image is black but the light is still on, it's having trouble holding on the the resolution. reset the settings to factory default and make sure the resolution matches. if the lamp goes out too, replace the ballast.
Is the fan set to run continuously? Go to the menu and see if it's set up to run. Also we have this problem with mounted projectors in our classrooms, we have to keep the room cool, and make sure the projector gets circulation of air. Hope this helps.
Have you checked the filters? I have a Sanyo PLV-75 and had a similar problem. The normal fan would come on when the unit was first started, then after a few seconds the secondary fan came on and then the unit would shut down. Called tech support and they asked if I had cleaned the filters. I did it, and it worked great. Check the manual for where the filters are and hit them first before getting a new bulb. Hope it helps!
I just did it, I took the filter out and then I cleaned it. After that all I did was reset the lamp and filter times which were at 160 for me, and now it works just fine. if the bulb goes out then maybe its time for a new lamp =(