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Philips 29pt4873 turns off and on sounds like big spark in back

Big spark in back of 29pt4873/79r and turns off and on its about 6 years old

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Hello and welcome to FixYa!,

Sounds like there is a short circuit in the power supply! Power supplies will de-grade over time and may be time to replace it.

Please contact me if you need any information on changing the power supply!

--P3NGYJ03

Posted on Dec 30, 2008

  • Jackson Henney Dec 30, 2008

    Look at this Review i found on "http://www.siliconchip.com.au/cms/A_30321/article.html"

    Quoted:

    I am beginning to see a few late-model 29PT2255/79R and
    29PT2252/79R Philips TVs. I am talking about the L01.1A chassis, which came onto
    the market about 2001 onwards. The usual problem is that the set is dead due to
    the fact that the switchmode power supply is cactus.

    The cause is not yet fully understood but this fault normally
    occurs during power surges. To fix it, I order and install what I call "Fred's
    Mod Kit", named after a friend of mine who repairs these sets under warranty. He
    found that eight parts usually need replacing - the chopper transistor (7521),
    its driver (7522), IC7520, R3523, R3530, D6523, D6524 and possibly D6525, which
    is not always fitted.

    Of course, strictly speaking, this isn't a modification kit but
    only a replacement parts list. Perhaps a modification will come out in due
    course?

    Another problem that is occurring is hum in some Philips
    models. One in particular comes to mind, the model 29PT4873/79R (L9.1A chassis),
    which can get particularly bad if placed on a resonating wooden table.

    The cause is a deflection yoke with vibrating windings and the
    solution is to remove it and dunk it in Estapol varnish. Beforehand, it is a
    good idea to mask any areas that might be critical such as where it contacts the
    picture tube and the three rubber spacers.

    The procedure should be repeated three times, allowing it to
    dry after each dunking before reassembling it onto the tube neck. That should
    stop the windings from vibrating and fix the problem once and for
    all.



  • Jackson Henney Dec 30, 2008

    It sounds like a very known problem.

    --P3NGYJ03


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