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Sony Trinitron color TV model KV-27S42

Discussion in 'Electronic Repair' started by trotgob, Aug 5, 2004.

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  1. trotgob

    trotgob Guest

    Hello,
    First of all, I am an electronics Tech, but with little experience with
    repairing TVs.
    My experience:
    My TV started making an arcing/buzzing sound (the picture is directly
    affected during arcing). I removed the cover and eventully found out that
    the "spark gap ground" was 'operating' on the board directly behind
    (connected to) the CRT. I did some basic research on the Internet this is
    the most relevant information I found:
    "A common cause is a breakdown inside the focus divider (usually part of the
    flyback or tripler) but could also be due to
    excessive uncontrolled high voltage due to a failure of the B+ regulator or
    HOT snubber capacitor, or (ironically)
    even a short inside the CRT."

    I was able to check the B+ regulator voltage. I measured 135 volts, which
    matched what was written on the board. So, I assume that is good.

    I don't know where to go from here. I'm hoping you people can help me.
    What can I try next?

    Other info: the manufacture date was November 2001. Also, the arcing is not
    constant. The TV works normally until the arcing returns.

    Thank you very much for your help.
    Sheldon Cribb
     
  2. Jerry G.

    Jerry G. Guest

    The CRT may have an intermittent short, or the flyback assembly must be
    changed to start with. If the CRT is defective, this will not be worth the
    investment.

    --

    Jerry G.
    ==========================


    Hello,
    First of all, I am an electronics Tech, but with little experience with
    repairing TVs.
    My experience:
    My TV started making an arcing/buzzing sound (the picture is directly
    affected during arcing). I removed the cover and eventully found out that
    the "spark gap ground" was 'operating' on the board directly behind
    (connected to) the CRT. I did some basic research on the Internet this is
    the most relevant information I found:
    "A common cause is a breakdown inside the focus divider (usually part of the
    flyback or tripler) but could also be due to
    excessive uncontrolled high voltage due to a failure of the B+ regulator or
    HOT snubber capacitor, or (ironically)
    even a short inside the CRT."

    I was able to check the B+ regulator voltage. I measured 135 volts, which
    matched what was written on the board. So, I assume that is good.

    I don't know where to go from here. I'm hoping you people can help me.
    What can I try next?

    Other info: the manufacture date was November 2001. Also, the arcing is not
    constant. The TV works normally until the arcing returns.

    Thank you very much for your help.
    Sheldon Cribb
     
  3. RonKZ650

    RonKZ650 Guest

    If the set works good normally and only arcs intermittently, the first thing to
    suspect is a bad spark gap. Start with the simple things first.
     
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