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JVC 32" TV timer lite blinks

Discussion in 'Electronic Repair' started by TA7205, Oct 26, 2004.

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  1. TA7205

    TA7205 Guest

    Hi;

    This AV-32F704 was dropped initially.

    Repaired PCB cracks, now unit turns on, shuts down after 5 seconds
    and timer lite blinks once a second. Is that a diagnostic code ?

    There's HV, but no sound or pix. There's a white flash and you see a raster
    collapse when it shuts down.

    Thanks very much,
    Rick
     
  2. john

    john Guest

    Was the TV working OK before it was dropped ?
    If yes it still has cracked board .

    kip
     
  3. RonKZ650

    RonKZ650 Guest

    My guess is you don't have vertical deflection. Put a meter or scope on the
    vertical wiring to the yoke and make sure you have vertical sweep present on
    one of the wires and not the other. Probably still have a crack. They can be
    elusive.
     
  4. James254

    James254 Guest

    Hi Rick,

    Almost certainly the unit is going into protection mode.

    I am not familiar with your model as it's for the US market only. But I have
    seen this before with JVC. It is a common practice for JVC TV's to go back
    into stand-by when a problem is detected, usually with the LED blinking at 1
    second or 1/4 second intervals, depending on the model and the number of
    protection circuits. Usually it is not possible to switch the unit back on,
    you must unplug the power cord, wait a short time then plug the cord back in
    again. This is a very good indication protection circuit thinks something is
    wrong!

    I suggest you look for cracks around the high voltage transformer. Pay
    special attention to the fine tracks on the PCB, some of these lines are
    used for x-ray protection.

    James
     
  5. TA7205

    TA7205 Guest

    Thanks for your help on this one.

    I did find a good vertical signal at the yolk (only one wire)

    Also, The micro is running.
    It has 12V, 9V and 5V supplies running.

    It's got HV, so I know the horizontal is working.
    I've scoured this board with a fine tooth comb looking for hidden fractures.

    I'll keep working on it.

    Thanks again,
    Rick
     
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