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Philips 3A chasis again.

Discussion in 'Electronic Repair' started by timppa, Nov 14, 2003.

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  1. timppa

    timppa Guest

    First thanks to those who answered last time!
    I have now working tuner. Many setting made in service menu where gone. Now
    I have ordered new EEPROM and zeners.

    But another problem came up.
    Picture is fine, but contrast or brightness bumps. Is it voltage problem or
    IC or capasitor prob? Where should I start looking for it?
  2. Sofie

    Sofie Guest

    I am not really certain what you mean when you say that the "contrast or
    brightness bumps" .......
    Guessing that you mean that the levels change, maybe with bight scene
    changes, the first things I would check would be the B+ voltage
    regulation..... also ESR check all of the electrolytics in the power
    supply, flyback derived B+ sources, and the screen regulation circuitry.
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