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Sony SG-613

Discussion in 'Electronic Repair' started by leo, May 5, 2004.

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  1. leo

    leo Guest

  2. David

    David Guest

    Some warnings about your Sony you are trying to repair.
    1. Do not use generics, they lack an internal fuse and if you missed
    any of the 30 some odd other parts that are bad, it will blow and
    everything else you just replaced with also blow again. Gets
    expensive after a while.
    2. That is an ancient tv set. Are you sure it is worth fixing. Last
    reliable source we had for the SG-613 had it listed at $48. You MUST
    fix the cause of its failure BEFORE replacing it.

    You can learn the hard way about that old chassis, it is NOT for
    someone to try and repair who has little experience.

    David
     
  3. RonKZ650

    RonKZ650 Guest

    The sets are *very* tough. The Sony procedure for diagnosing the SG613 failure
    was to replace the SG613 and with an external power supply, inject 19vcd on
    both the 19v and 130v power supplys, then with an oscilloscope, meter and HV
    probe go through a very lengthy diagnosis to determine what was causing the
    SG613 to fail. Even when all this was followed to a T and everything was
    seemingly OK, the SG613 would short within 1 second of applying AC power about
    25% of the time, and another 25% of the time would fail within a couple weeks.
    So you had a 50/50 chance of actually fixing the set even when you did
    everything right and used all original Sony parts.
    Most shops in the late 70s wouldn't even touch one of these Sony's. Very
    expensive and risky to repair. Definately not worth the effort now. These were
    about a $400 set and a darn good set for it's day, but it's day is done.
    Ron
     
  4. Art

    Art Guest

    Repaired quite a lot of the KV1720/1920 versions. Had a technique where we
    actually ran the horizontal drive circuitry with external supplies. We would
    confirm the osc and drive circuitry were fully operational before ever
    installing a new 613. Of course we would ring the LOPT and check the ringing
    caps in the horiz circuit as a manner of routine. Even then we would
    encounter a few that wanted to play outof the box and just became dogs. I
    totally agree, first these sets are not worth a whole lot of effort since
    reliable replacements are available. Second, if you do not have the proper
    schematics and know the unique aberrations of these old SONY sets you are
    just spinning your wheels. Money before any other equalizations has already
    been addressed by the other posts. PLEASE check all your cross posts.
     
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