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UPDATE: Weird RCA TV Problem

Discussion in 'Electronic Repair' started by Brad, Nov 30, 2007.

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  1. Brad

    Brad Guest

    Hi,
    It looks like the problem is fixed (see below for details).

    This is the first time I have encountered a button switch/s that tested good
    (no "leakage" at 50V test), but turned out to have intermittent "leakage".

    Thanks to everyone who offered their help, Brad
     
  2. Dave

    Dave Guest

    Hey Brad,

    I have encountered a similar problem a couple times with widely different
    devices in the past twenty years, and it turned out to be a power supply
    problem in both cases. In the first, someone had replaced the correct fuse
    with an incorrect type, and the replacement "blew" but continued to operate
    due to arcing across the resultant gap. When the fusing element heated up
    it curled, opening up the gap left by being "blown." When the gap widened,
    it stopped arcing and consequently began to cool. As it cooled, it
    uncurled, closing the gap again... Up and down, at regular intervals. From
    a blown fuse of the improper type. Too crazy to be believed, but I saw it
    and fixed it. Saved the fuse just to remind me of how crazy some problems
    and fixes can be. This was with a 1/4 million $, high-speed printer in a
    mainframe computer environment. Too much.

    The second time was with a "boombox" type radio, but only when it was on the
    power cord and not the batteries. Turned out the cord was not the original,
    and didn't fit well. Loose connection heated up, the round "contacts" in
    the cord expanded, and the radio shut down. Five minutes later they had
    cooled and contracted enough for it to come back on. New cord fixed it.

    Shaking my head just thinking about these two. If your problem comes back,
    try not to make assumptions about what is/is not causing it. Granted, it
    sounds like you found the problem, I just thought I would share my own
    experience, as your leaky switch sounds like another electrothermal anomaly.

    Best regards,

    Dave
     
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