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Sanyo DS31590 vertical problem

Discussion in 'Electronic Repair' started by Chuck, Jul 28, 2003.

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  1. Chuck

    Chuck Guest

    Hi all. I inherited this set from a tv repairman who
    was closing up shop. He couldn't repair it so I
    decided to give it a go. The picture has vertical
    fold over at the top and is pulled up from the bottom.
    I've replaced all the electrolytic caps in the
    vertical circuit and the jungle, eeprom , and vertical
    output ics. Other capacitors in the vertical circuit
    have been subbed. Resistors have been checked in
    circuit and appear to be within tolerance. Adjusting
    the vertical parameters in the service menu doesn't
    change the symptoms. The capacitors in the pincushion
    circuit that can affect vertical height have been
    subbed. If anyone has ever seen such a problem with
    this chassis, I'd appreciate their assistance.
    Thanks. Chuck
     
  2. john

    john Guest

    Keep checking ,you have missed the 2 bad caps.

    kip
     
  3. chuck

    chuck Guest

    Unfortunately, this isn't a normal capacitor problem though the
    symptoms are the same. I have a schematic and over 30 years of repair
    experience but thanks for the suggestion. Chuck
     
  4. Sofie

    Sofie Guest

    Chuck:
    Have you done a ring test on the vertical deflection coils in the yoke??
    Also check any of the diodes in the circuitry..... etc.
     
  5. Jerry G.

    Jerry G. Guest

    If you are very sure that you ESR checked, and replaced ALL the bad
    caps, then the only thing you have left are some base components, and
    the deflection yoke.

    The caps you missed are the bad ones... I am convinced that you still
    have a bad cap in this one, or the deflection yoke is defective. In
    some sets, there are some small caps, and or thermo resistors in the
    deflection yoke for compensation. This may not be the case for this
    set, but it is a thought. I have had resistors go sort of opened in the
    deflection circuits causing this type of fault as well.

    But... I am still sort of convinced by your description, and by past
    experience there is a cap or two that you missed!

    --

    Greetings,

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







    Hi all. I inherited this set from a tv repairman who
    was closing up shop. He couldn't repair it so I
    decided to give it a go. The picture has vertical
    fold over at the top and is pulled up from the bottom.
    I've replaced all the electrolytic caps in the
    vertical circuit and the jungle, eeprom , and vertical
    output ics. Other capacitors in the vertical circuit
    have been subbed. Resistors have been checked in
    circuit and appear to be within tolerance. Adjusting
    the vertical parameters in the service menu doesn't
    change the symptoms. The capacitors in the pincushion
    circuit that can affect vertical height have been
    subbed. If anyone has ever seen such a problem with
    this chassis, I'd appreciate their assistance.
    Thanks. Chuck
     
  6. chuck

    chuck Guest

    I've replaced diodes, tested all resistors out of circuit and replaced
    all capacitors so I think you are right about it having to be the
    yoke. My ringer is at work so I will take it home tonight to do the
    test. I haven't seen a yoke cause a problem like this since tube bw
    sets were common. Thank for your help. Chuck.
     
  7. chuck

    chuck Guest

    The problem turned out to be the yoke which is only available with the
    crt. Thanks for the help. Chuck
     
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