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Help Please: Sudden Video Failure with Sony SLV 770HF VCR

Discussion in 'Electronic Repair' started by Ron Kalil, Jul 15, 2003.

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  1. Ron Kalil

    Ron Kalil Guest

    I have owned a Sony SLV 770HF VCR for several years, but have used it only
    infrequently. When I have used it, it has alaways worked well. Now, with no
    prior warning, the machine appears to have failed. Upon turning it on
    everything seems normal. When playing back a tape, the first few minutes also
    seem normal, but then scattered horizontal interference begins to intrude as if
    the tape was not making good contact with the head. The interference is
    followed at an interval that varies from 5 to 15 minutes by loss of the chroma
    signal. The gray scale in the resulting monochrome image then slowly compresses
    until only white outlines on a black background are visible. Within 5-10
    additional minutes, the high contrats image disappears entirely and cannot be
    recovered. If the machine is turned off for at least 30 minutes, the entire
    sequence repeats.
    The symptoms suggest a time/temperature dependent failure, but I am puzzled by
    why a temporary recovery is possible when the machine is turned off.
    If anyone has repair experience with a Sony VCR with a similar progression:
    flutter, lack of chroma, lack of gray scale, lack of image, I would be very
    grateful for your advice. I would like to keep the machine and should be able
    to repair it myself, but I need some help in diagnosing the source of the
    Thanks very much.
  2. bigmike

    bigmike Guest

    Check head preamp board: Ic1 for a leaky 2.2uf/35 Smd Cap. Also, look for
    bad solder joints on the board, a common problem.
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