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TV Philips G112 chassis pincushion problem

Discussion in 'Electronic Repair' started by Freddy T, Nov 26, 2003.

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  1. Freddy T

    Freddy T Guest

    I have a Philips TV , it's a G112 chassis with rather curved looking
    vertical lines at each end, pincushion . So I though it was the E/W
    circuitry, you know the vertical modulated onto the horizontal stuff. But
    it all checks out okay. Can anyone kindy offer any help?

    I think the model number is a 29sp1798


    Thanks for any help in advance

    Frredy T
     
  2. Jerry G.

    Jerry G. Guest

    How did you determine that E/W circuitry is working correctly? If it is
    working correctly the E/W pin should come in.

    --

    Greetings,

    Jerry Greenberg GLG Technologies GLG
    =========================================
    WebPage http://www.zoom-one.com
    Electronics http://www.zoom-one.com/electron.htm
    =========================================


    I have a Philips TV , it's a G112 chassis with rather curved looking
    vertical lines at each end, pincushion . So I though it was the E/W
    circuitry, you know the vertical modulated onto the horizontal stuff. But
    it all checks out okay. Can anyone kindy offer any help?

    I think the model number is a 29sp1798


    Thanks for any help in advance

    Frredy T
     
  3. Freddy T

    Freddy T Guest

    I disconnected the main transistor in the E/W cctry and got a bowed in
    picture with the deflection stopping along the edges of the bow. When I
    restored the transistor I got a full screen but any vertical lines close to
    any edge where bowed inwards, ( my original problem). I also tested both
    transistors and measured all the components in the E/W circuitry,
    includings caps for value and also ESR value on the electros.


    Freddy t
     
  4. mo

    mo Guest

    Try removing coil 5933

    measure the resistance

    should be about 5 Ohms (1 Ohm is short - Replace)

    Good Luck,

    --- mo ---
     
  5. Freddy T

    Freddy T Guest

    I disconnected the main transistor in the E/W cctry and got a bowed in
    Thanks mo

    Unfortunately I had taken that coil out and did a ring test and it came
    up okay. But I took it out again after seeing your advice and blast it
    measured 5 Ohms.

    I may have to start removing more of those pesky surface mount
    components in the E/W cctry. Arrgh what a pain.

    I wonder if there is a fault elsewhere that can show up as an E/W
    problem? I am not sure if I should continue working in the E/W area or
    maybe look elsewhere?

    Thanks for any help
    Freddy T
     
  6. GPG

    GPG Guest

    Is the bow the same with and without e/w? If so, missing sawtooth from vert o/p
     
  7. Freddy T

    Freddy T Guest

    Thanks GPG.


    I ended up finding my problem. Leaky vertical caps had caused the vertical
    feed to the E/W to go high. Some signal was getting thro but not much.
    Replaced the vertical caps and fixed the connection to the E/W and all
    works.


    Thanks for everyones help.
    Freddy T
     
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