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RCA TV model F32450, Ch. ATC113CA1 just clicks

Discussion in 'Electronic Repair' started by [email protected], Sep 30, 2005.

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  1. Guest

    The customer said he smelled something burning a number of times when
    trying to power the set on. He says he never saw any smoke. We tried it
    when it came in but there was only the sound of a relay energizing and
    then dropping out about one second later. I could not locate visually
    or (with my nose) where anything seemed to have burned from. I checked
    the HOT and the SCR and three diodes nearby it and found them all to be
    good. I repaired the troublesome coil also. I can hear the little chirp
    from the power supply when you first plug the set in which leads me to
    suspect that the SMPS may be good. I have seen flybacks go bad in some
    of these but I don't own a ringer so I can't be certain of that. Can
    anyone offer a rule out or troubleshooting procedure or perhaps an
    opinion based on the symptoms I've described? Thanks for any
    assistance. Lenny Stein, Barlen Electronics
  2. Art

    Art Guest

    Normally when the lopt go in these sets that flak the h-output device also.
    Check the case of the lopt to make sure there are not any little pin holes
    with "juice" leaking out, indicating an internal failure, since the probable
    odor. Have you checked the PCC circuits, thery have become a bit of a
    nusiance also.
  3. kip

    kip Guest

    HOT plus IHVT plus plus.

    Have fun

  4. Guest

    I scoped the collector of the HOT while attempting power on. It peaked
    at only around 600V and looked pretty bad. After replacing the
    transformer the set worked fine. I again looked at the collector
    waveform. It exceeded my graticule even with he X10 probe but I
    estimated it to be around 1200Vpp with good symetry. Isn't it odd
    though that the transistor was spared? BTW, just for my own edification
    I did some comparison resistance readings (excluding of course the HV
    winding), between the new and old transformers while they were both out
    of circuit. There were some very minor descrepancies on two of the LV
    secondaries in the order of tenths of an ohm but other than that noting
    jumped out at me. Does anyone know exactly what fails in these things?
    Thanks for all the help and advice. Lenny Stein, Barlen Electronics.
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