Question about Mitsubishi WD-73733 73" HDTV

1 Answer

TV will not power on, strange arcing and poping noise from rear

The lamp looks perfectly fine on a WD-73733 DLP set. However there is a strange "arcing" coming from a component that the bulbs connects to. It looks like a capacitor is trying to stay lit, I believe this "cap" is the reason I used to see a soft blueish white glow coming from the back of the set when it was is use. However this "cap" doesnt stay lit. I am assuming this could be the ballast board/power supply for the lamp. Please help! limited money and don't wanna get jerked around by TV repair people. Model is Mitsubishi WD-73733 Manufactured in July of 2007 with SN# of 101951. Please help!

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  • blmckenna Jul 04, 2009

    I forgot to add; The set does power ON, but no picture and have since canceled my cable service, unable to tell if there is audio. I have performed the reset step on the front control panel. You can hear the TV powering up and can feel air flow from the back. The part that is "arcing" is visible from the rear of the set through a ventilation port. the "arcing" part is located on an OSRAM Circuit board. the little "capacitor" is silver and white and color and the center of it lights up or "arcs" however the "arc" is contained within the "cap" it doesnt jump out to anything else and there are no "burn" marks anywhere on this circuit board. I have noticed the Lamp housing plugs directly into this board assembly. As I said before there used to be a constant glow from the rear of the TV, I believe this "cap" was the reason but it will no longer stay lit. Is there a part number to identify this? I am rather tech savvy and know I could replace the board/board carrier if I could get my hands on it.

  • blmckenna Jul 05, 2009

    I guess my next question would be, If the Lamp is indeed bad would the ballast board be acting the way it is, with the "arcing" popping? I have seen what alot of blown Lamps look like and mine doesnt seem to be, but has not been replaced. But like I asked, would the ballast board be doing this?

  • blmckenna Jul 05, 2009

    I guess my next question would be, If the Lamp is indeed bad would the ballast board be acting the way it is, with the "arcing" popping? I have seen what alot of blown Lamps look like and mine doesnt seem to be, but has not been replaced. But like I asked, would the ballast board be doing this?

  • Larry Murkerson
    Larry Murkerson Jul 20, 2014

    Mine is doing the EXACT SAME thing. Did you find out what was causing your issue?

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  • Master
  • 668 Answers

Even though the Lamp looks good it does not mean that it is. The only way to know is to relace it. If you have already replaced it with a Mitsubishi Lamp Assy. then the Ballast board would probably be the cause.
Hope this helps,
Skyassoc

Posted on Jul 04, 2009

  • Steve Yocum Jul 05, 2009

    Yes, the Ballast Board would cause this and the Lamp not igniting will also cause the Ballast board to act like it is..

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