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Ballast UART Error

I have an optoma EP771 that powers up, shows image and then shuts off. It then blinks the error code for Ballast UART error. The power supply seems good. Not sure if this is a ballast or main board issue. What should I look for? Should I try to order the ballast. Nobody seems to know what this error actually means.

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  • Nathaniel Campbell Jan 09, 2009

    I also purchased an Optoma EP771 and it turns on and shows image. After approx 1 minute, the lamp shuts down and the blinking error for Ballast UART flashes.

  • Ryan Heyworth
    Ryan Heyworth Dec 18, 2013

    I've changed my bulb and still get the same error? What does the 'ballast' refer to?

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Same thing happened to me. After one minute of running, lamp shuts off and 5 power led blinks and 3 ready led blinks, indicate UART ballast error. Well, I purchased a new lamp, and installed it, and the problem was gone. I looked closely at my old lamp, and it showed a little blister inside, and a tiny spot of white residue, perhaps it was the whole problem there, although I don

Posted on Oct 03, 2010

  • Ryan Heyworth
    Ryan Heyworth Dec 18, 2013

    I've changed my bulb and still get the same error? What does the 'ballast' refer to?

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