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Panasonic Rear Projection TV -dark picture

Model PT 51844A, Mfg Aug 1999
Picture darkened basically overnight, turned it to max bright...little help.
Sounds like a lamp, 1st time to change...had back open, saw 3 lamps which seemed to be lit up yet are they working...???

Is there another spot for a lamp that I am missing?

Jim

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  • Javabean Dec 11, 2007

    Thanks premtech...that sounds like the problem since the CRT's were lit.

    Next questions are:

    1. Where can I get the capacitor C581 ? (I live in Denver, CO)

    2. What does it cost?

    3. Where is the "D" board? (do you have a pic?)



    thanks for your help...I am trying to keep this older tv til I can save up for an upgrade.



    javabean

  • we3kings Dec 28, 2008

    Me too. but can not find the D board. Anyone who has a diagram of the electrical components in the back would be very helpful. Have looked on line for manuals, no help, can not find the capacitor @ C581 --
    it is the 33 uf/160 volt cap. See many boards, which is D?? Nothing stamped on any of them.

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  • Master
  • 934 Answers

Javabean,
First off I think you meant Panasonic PT-51G44A which is an AP815 chassis. That unit has an all to common failure of the capacitor at C581 on the D board which is a 33uf/160v cap. Replace it and I think that will solve the problem..
Bill

Posted on Dec 11, 2007

  • William Rayburn
    William Rayburn Dec 11, 2007

    BTW: That's simply a projection screen Tv not a DLP... What you're seeing are the tops of the CRTs (cathode ray tubes). Sorry, no lamps in it.. It's a bit confusing because both formats are referred to as PTV or (projection screen Tv) but only the DLP (Digital Light Projector) uses a lamp as a single light source to project an image.

  • William Rayburn
    William Rayburn Dec 11, 2007

    Look at your board assemblies real close... Each board has an identifier (A, B, C, D etc.) and there are position numbers to each component soldered to it... At pos# C581 on the D board you'll find an electrolytic cap. If you don't easily see the D stamp on the board you'll know you're on the right board when you're in the 500 series position numbers. On the cap will be the markings 33uf/160v and it's polorized so there is a positive and negative. The new cap has to be placed in the circuit according to its polorized direction and the cap indicates which side is negative... You can easily other see caps on the board and what denotes their negative side with relation to the direction on the board. Usually, the negative side marking on the board will have a small box or block near the hole opening denoting negative.

    A single cap like that can be purchased from your local electronic supply store. Just tell them you want a radial 33 micro ferret 160 volt electrolytic capacitor. Should be about 3-4 dollars... If you try and buy these from a wholesale distributor you'll get a better price but usually you have buy minimums to contend with.. If all else fails I can send you one by mail..

    Sorry, don't have one of these models in the shop right now to send a picture...

    Bill

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Hi premtech, i finally found an electronics store that had the cap and that would solder it in place on the board without having the tv at their shop.
i carefully took out the D board and brought it to the shop, then after he soldered it, i put it back in place in the tv. the dark screen left, but now there is a strong red tint on the screen. i've tried to adjust by the "picture" options and that has helped some. any ideas?
FYI: i subscribe to comcast and when on pause mode with their dvr, normally after 5min or so, the screen goes black with the current time displayed. now the screen goes dark red tint.''
-any other ideas?

Posted on Dec 24, 2007

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