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Sony GV-8 Portable TV/8mm VCR

Discussion in 'Electronic Repair' started by Chris F., Dec 18, 2006.

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  1. Chris F.

    Chris F. Guest

    I needed something for transferring 8mm videotapes to DVD, and I bought
    this non-working video walkman hoping to at least get the VCR section
    working. The unit powers and the OSD works fine, as do all the mechanical
    functions of the VCR, but the video is very dark and has lost both vertical
    and horizontal sync. I found a post regarding a similar unit on a website,
    the guy had the exact same problem, but of course there were no replies. Is
    this a fairly common problem for these, and is there any quick solution? I
    don't care about the TV part as long as I can output the video to something
    else.
    Thanks for any advice.
     
  2. It could be the common problem of the guide posts lossened up and moved
    out of alignment. A proper alignment and locking the posts would solve
    this.
    Or... If small surface-mounted capacitors are used on the boards - like
    similar Sony 8mm camacorders, there could be dozens of leaking caps
    making repair difficult to impossible.

    But first try giving the entire tape path a good cleaning.
     
  3. Chris F.

    Chris F. Guest

    Or... If small surface-mounted capacitors are used on the boards - like
    I forgot to mention that the audio cuts in and out, and the same symptom are
    present whether playing a tape on the built-in LCD, through the A/V out, or
    when using the A/V in. There are indeed tons of those caps, some round and
    some square, and I was wondering if they might be responsible.
     
  4. Chris F.

    Chris F. Guest

    I should have figured the caps were bad - the first one I removed from the
    board was leaking electrolyte. There are at least a couple dozen of these
    caps, so this will definately be a long-term project to just poke away it.
    One question though - what type of caps are the square black ones? They have
    values similar to the round silver ones, but I can't locate any replacements
    that would physically fit in their place.
    Thanks.
     
  5. Chris F.

    Chris F. Guest

    Well I decided to tackle this project after all, guess I have too much
    time on my hands. After replacing all 40+ of the round silver surface-mount
    caps (all of which had physically leaked), I finally got the tape section to
    work - however it will only output through the A/V jacks - the built-in LCD
    is still the same, with the loss of sync and dark image. What could I have
    missed? There are some other polarized caps in rectangular black cases, I
    tested a couple of these and they were fine with no leakage. I assumed these
    were tantalum and did not require replacement.
    I suppose this is good enough, I only needed the tape signal to copy to
    another format, but it would be nice to fix the LCD too. (I did replace the
    caps in the LCD section). There can't be many of these units still in
    working condition.
     
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