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Any Sony "G" power board gurus out there?

Discussion in 'Electronic Repair' started by Vector Viper, Jan 3, 2004.

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  1. Vector Viper

    Vector Viper Guest

    I have a "G" 1-659-752-21 board Q601 and Q602 blown, and replaced, with D648
    (150 v protect zener)

    Board works, but has almost NO regulation for +130v out...100VAC in outputs
    +145V B+
    Oddly, the LOAD regulation is good, pix size does not change with
    brightness...

    Any 1 part that screams "I'M BAD"?

    Aaron H.
     
  2. I'm not a TV guy, but from what you say, it's actually regulating perfectly.

    The REFERENCE is bad.

    Comparing to stuff I actually know, on a vcr smps, if the 5-volt line is
    noisy (bad cap) the other voltages will run high.


    Mark Z.
     
  3. Jerry G.

    Jerry G. Guest

    Do an ESR test on all the caps in the supply and horiz scan circuits.

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    Jerry Greenberg GLG Technologies GLG
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    I have a "G" 1-659-752-21 board Q601 and Q602 blown, and replaced, with D648
    (150 v protect zener)

    Board works, but has almost NO regulation for +130v out...100VAC in outputs
    +145V B+
    Oddly, the LOAD regulation is good, pix size does not change with
    brightness...

    Any 1 part that screams "I'M BAD"?

    Aaron H.
     
  4. RonKZ650

    RonKZ650 Guest

    I had one that one of the small transformers on the board in the area of the
    2SC4834s was bad causing no regulation. The only way I found it was after
    checking virtually every part it was about all that was left, so I changed it.
    A very tough problem to diagnose, an ohmeter ain't going to find this problem.
    Ron
     
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