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DOG: Intermittent Click click, clickclick! RCA ITC008 (27F650TYX1)

Discussion in 'Electronic Repair' started by Jason D., Oct 28, 2005.

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  1. Jason D.

    Jason D. Guest

    Got one here that is a stumper:

    RCA 27F650TYX1, no pic or sometimes pic but goes out when relay
    intermittently clicks and heater dims and brightens, sometimes dims
    out and back on every time relay clicks. Let TV batter the relay with
    time, now no picture. Relay clicking is very erratic in pattern.

    Did voltages checks: 5V stable for the micro/jungle, 7V good, 22V
    good and never above specs, 126V never above but when it unloads
    becaue of horizontal drive cutting out voltage drops to appox 106V
    then relay clicks voltage comes back up and horizontal cuts in at all
    once.

    Did troubleshooting tips:

    Pulled crt board & vertical plug. Click click click still unaffected.
    Pulled BL001 plug to disable pincushion. Still clicking.
    Checked EHT (aka X-ray protect), never above 2.3V.
    Checked beam sense, within specs.
    Checked vertical & horizontal waveforms, all GOOD.
    Scoped the cathodes for emissions, kine bia sensing come up and get
    into operation when heaters is hot enough.
    Checked SMPS with scope, good there too.

    Flexed & smacked the chassis with no effect on that fault.

    Oh YES, did cut off both plugs and solder both ends of pincushion 3
    wires (two brown and one blue wires, wire order in correct positions),
    have done this modifications 20 times before with success.

    Sigh! Looks like either big IC (IV001?) is the blame or data bus
    "dirty". Seen this before?

    Cheers, Wizard
     
  2. Hi!
    Okay, forgive me if you've done this and if it sounds obvious:

    Did you check the offending relay? Perhaps it has burned contacts or is
    otherwise not functional.

    William
     
  3. Jason D.

    Jason D. Guest

    If you're famillar with this ITC008, this relay is used for degaussing
    only. This relay clacking is syptom of a problem.

    Cheers, Wizard
     
  4. Asimov

    Asimov Guest

    "Jason D." bravely wrote to "All" (28 Oct 05 02:12:02)
    --- on the heady topic of "DOG: Intermittent Click click, clickclick! RCA
    ITC008 (27F650TYX1)"

    You didn't mention the audio output anywhere...
    I have read of this behaviour in RCA's caused by the audio output.
    If the relay is good then it's a shot in the dark...

    A*s*i*m*o*v


    JD> From: (Jason D.)
    JD> Xref: core-easynews sci.electronics.repair:346535

    JD> Got one here that is a stumper:

    JD> RCA 27F650TYX1, no pic or sometimes pic but goes out when relay
    JD> intermittently clicks and heater dims and brightens, sometimes dims
    JD> out and back on every time relay clicks. Let TV batter the relay with
    JD> time, now no picture. Relay clicking is very erratic in pattern.

    JD> Did voltages checks: 5V stable for the micro/jungle, 7V good, 22V
    JD> good and never above specs, 126V never above but when it unloads
    JD> becaue of horizontal drive cutting out voltage drops to appox 106V
    JD> then relay clicks voltage comes back up and horizontal cuts in at all
    JD> once.

    JD> Did troubleshooting tips:

    JD> Pulled crt board & vertical plug. Click click click still unaffected.
    JD> Pulled BL001 plug to disable pincushion. Still clicking.
    JD> Checked EHT (aka X-ray protect), never above 2.3V.
    JD> Checked beam sense, within specs.
    JD> Checked vertical & horizontal waveforms, all GOOD.
    JD> Scoped the cathodes for emissions, kine bia sensing come up and get
    JD> into operation when heaters is hot enough.
    JD> Checked SMPS with scope, good there too.

    JD> Flexed & smacked the chassis with no effect on that fault.

    JD> Oh YES, did cut off both plugs and solder both ends of pincushion 3
    JD> wires (two brown and one blue wires, wire order in correct positions),
    JD> have done this modifications 20 times before with success.

    JD> Sigh! Looks like either big IC (IV001?) is the blame or data bus
    JD> "dirty". Seen this before?

    JD> Cheers, Wizard

    .... If all else fails, hurl it across the room a few times!
     
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