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Sony TV blows fuses

Discussion in 'Electronic Repair' started by [email protected], Mar 7, 2007.

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  1. Guest

    I have a Sony Trinitron from 1989, model KV-20TS10. The main fuse was
    blown, so I put in another and plugged it in. Within a few seconds I
    heard the power relay click (it turned itself on) and the fuse blew
    immediately. Not enough time for audio, picture, nothing. I did a
    quick check of the H.O.T. in-circuit and it didn't seem to be
    shorted. The bridge rectifier appears to be fine. I'm no TV repair
    expert, but it seems this one should be relatively easy, if I had a
    schematic.
    Are there any common problems with this set that causes this symptom?
     
  2. Sofie

    Sofie Guest

    hondgm:
    Wow.... a little optomistic with your following statement....
    "I'm no TV repair expert, but it seems this one should be relatively easy,
    if I had a schematic."

    Take the hot OUT of circuit and test it to make certain it is not
    shorted.... your statement "it didn't seem to be shorted" does not inspire a
    lot of confiedence. Be aware that the HOT can fail and not neccessarily
    show a direct short on your meter... it can have fatal CE leakage that won't
    show up as a short.
    ...... and check the bridge, you should know for certain that it is good and
    not that it "appears to be fine."
    Check the B+ voltage regulator and/or replace it and also for shorted/leaky
    filter caps in the the raw B+ and the regulation circuitry. Also check for
    shorted caps and faulty diodes in the flyback derived B+ circuitry.... all
    of this is relatively easy to find without a schematic.
    Daniel Sofie
    - - - - - - - - - - -- -
     
  3. Dani

    Dani Guest

    The fuse rarely blows on those Sony T.V.'s, even when they blow up.
    Unhook the degaussing coil, just in case it is drawing
    too much current at turn on, but first check the two 2SC4834 switching
    regulators.Q601/Q602 (P/N# 872901951), R607 0.1 ohm fusible, (P/N#
    120293361), VDR601 (P/N# 180728811), VDR602,VDR603 (P/N# 181005311).
    Dani.
     
  4. Guest


    Are you sure you're looking at the correct set? On this one, I don't
    see a Q602, R607, or any VDRs, and Q601 is a little TO-92 package.
     
  5. b

    b Guest

    start by checking the degauss circuit. unplug the coil and see if that
    helps.

    -B
     
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