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Thread: Atari 520 STFM Vertical line on the display

  1. #1

    Default Atari 520 STFM Vertical line on the display

    Hi Folks,
    I have vertical lines on the display of my STFM. The are black when on the desktop but change to other colours depending on the background oimage.
    So far I have ruled out the display (monitor) and the PSU, by substitution.

    Do anyone have any ideas what could be the cause.

    I would be most grateful for any help you could offer.

    Tel
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  2. #2
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    looks like memory gone bad.

  3. #3

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    If programs/games/demos still run correctly then it could be a bad connection of the shifter chip.

    From memory: In the early days they were socketed, later Atari added a clip to keep the chips 'in' and after that they simply soldered them directly to the board.

  4. #4
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    Quote Originally Posted by gertk View Post
    If programs/games/demos still run correctly then it could be a bad connection of the shifter chip.

    From memory: In the early days they were socketed, later Atari added a clip to keep the chips 'in' and after that they simply soldered them directly to the board.
    Please don't try the old "drop from 2 inches fix" which was commonly advised in the past. Take it apart and re-seat the socketed chips
    Dave
    G4UGM

    Looking for Analog Computers, Drum Plotters, and Graphics Terminals

  5. #5

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    Thanks Guys,

    Alas all my chips are soldered except the roms. I have studied the shifter from above and it looks like it may have a dry joint on pin 40, I will take the board out and re-solder when I get a chance.
    Does anyone know what pin 40 does. I am assuming it is pin 40. Its the one opposite pin 1 so I guess it could be pin 2, not sure.

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