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Panasonic model CT37G24A continuing problems

Discussion in 'Electronic Repair' started by [email protected], Oct 11, 2008.

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  1. Guest

    This is the set that took a serious lightning hit. It was dead with a
    blown fuse when I first got it. I replaced about ten components so far
    in the power supply and startup circuits. The last remaining 4
    problems were: that the set was stuck on one channel, the sound was
    moderate and would not change, the remote would not work, and the
    "action" button would not invoke the menus. I just replaced the
    microprocessor and this has fixed the channel and sound problems, but
    the "action" menu and the remote still will not work. My scope fell
    off the cart yesterday and so its not working either so I can't look
    at the output of the remote receiver. This has been a real dog. I've
    tried several receivers out of other sets but I still can't get the
    remote to operate. I've never found the receivers to code sensitive. I
    thought that any receiver would send an adaquate signal to any
    micro,.as long as it works on 5V. Is this correct? The input and
    output DC voltages on the receiver are correct. This is like a
    "closed" circuit with just a few components from the receiver into the
    micro so I can't imagine what else could inhibit the remote from
    working. Can I check the receiver with anything other than a scope?
    Does anyone think that there could still be some common problems
    causing these remaining two fuctions not to work? I gotta stop taking
    in these lightning jobs. Thanks, Lenny
  2. Franc Zabkar

    Franc Zabkar Guest

    AFAIK, the IR signal is most often modulated on a 38kHz carrier. If
    your set uses a different frequency, then the sensitivity of any 38kHz
    replacement sensors may be too low.

    Why not hold down the Volume key on your remote and monitor the
    receiver's output with a DMM? Assuming a +5V supply rail, a continuous
    pulse train should show up as a DC level somewhere between 0v and +5V.

    Or you could hook up an LED to the output, buffered with a transistor
    if necessary.

    - Franc Zabkar
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