Question about Philips Magnavox 51MP392H Rear Projection Television

2 Answers

Projection tv problems

Hi, I have a magnavox rear projection tv and I am having problems with it. It is only about 2 years old. I have shadows around the images. I did a manual convergence, but that didn't get rid of the curve in the picture. There is one at the top and bottm of the screen. How can I fix this? Is this something that I would be able to do? I am electronically inclined.

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  • jjdkjdk Dec 13, 2007

    Premtech,



    Thanks for the information. Will it hurt the unit to continue to watch it until we can afford to have it fixed, or should we shut it down until then?

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2 Answers

Thanks, premtech. We will leav it off until we get it fixed. Hopefully that will be soon.

Posted on Dec 13, 2007

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  • 934 Answers

Jj,
The convergence amps have most likely failed. This is the number one leading cause for the symptom your describing and the most common failure on that unit.
Your Tv take two STK392-120 Sanyo Ics for convergence amps, located at Ic7404 and Ic7405 on the board and mounted to a rather large aluminum heat sink. In addition you will most likely have to replace R3159 and R3160 (6.8 ohm 1w) resistors and test the remaining low ohm resistors for change in value.
I would strongly recommend that you not do this repair yourself in this particular unit it is rather complicated by having to remove the boards to gain access. Notwithstanding that you could damage some of the smt components just taking the board out, you need some diligence in labeling outputs to crts from ssb board and on both ends of the connectors - otherwise re-assembling it could cost you a greater failure somewhere else. In a nutshell, replacing convergence amps in this unit is "extremely difficult" compared to say a Samsung which is a walk in the park! And the real downside is a little mistake can really cost you... Besides, a shop would really earn their money on this one..
Bill

Posted on Dec 12, 2007

  • William Rayburn
    William Rayburn Dec 13, 2007

    It's better not to run it - the Ic that's failed is most likely shorted and placing some serious stress on the yoke return resistors. It doesn't matter too much that another resistor or two might fail because that would merely drop the video - but if it doesn't open it could short the windings in one of the yokes and that starts getting expensive...

    Sorry!

    Bill

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