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Projector problems Hi, I have a 3m MP7730 projector that keeps going into standby mode. I switch it on and it works fine, it warms up and after 10 seconds of projecting the lamp switches off and the projector goes into standby mode. There is a lamp indicator that keeps flashing.. and the instruction manual says that the indicator flashes when the lamp is too hot. But the projector won't stay on for more than 5 minutes and it doesn't seem over heated. Any ideas? Thanks, Maria

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  • David-IB Dec 02, 2007

    I have an MP610 which turns on for a few minutes then the "Temp" (temperature) light comes on. Then a few seconds later the fans become a little louder (faster?) and then the bulb turns off and when the unit has cooled down the fans go off and the power turns off.

    It is outside its 12m warrenty, so I took the top off it. The fans are both moving freely, and appear to be working fine. There doesn't appear to be much heat coming from the fans before it cut off - the air hardly got warm.

    I started up the projector with the top off (hoping it might run cooler that way) but the same cycle occurred.

    I disconnected it from the mains, I took the metal cover off the circuit board, (which required only disconnecting three screws incl one which was securing an earth connection) in the hope that I would find a variable resistor to re-adjust the temperature sensor (assuming this had gone wrong). I found nothing but solid-state circuitry, unsurprisingly.

    I screwed the cover back on (including the earth wire) and turned it on again, and now it is running without cutting out. Why? I didn't do anything!

    It has now been running for several minutes and the air from both fans is fairly warm (but not hot).

    What caused this? Will it happen again? What should I do if it does happen - take it apart and put it back together again?

  • Anonymous Dec 26, 2008

    the lamp keeps going out after 10 seconds

  • Doan Quang Hung Mar 13, 2013

    Thank you



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After 2 years I finnaly solved the problem. There was a flaw in the lamp´s temperature circuit. A technician disassambled my BENQ PB8253 unit and fixed the problem. Charged me US$ 75.00. I´m in Brazil.

Hope this can help.

Posted on Sep 14, 2009

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Hi David IB

I've had teh same experience with a BenQ MP720 ( just the XGA version of your Projector )

I queried this with BenQ Engineer in Dubai and he said that it sometimes works exactly like a short on the machine.

If I could give you a tip , If it happens again don't put back the metal cover of the Mainboard it solves the problem 100%

Posted on Mar 27, 2008


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