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Nolium

Atari 800XL, occasional picture problem after UAV install

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Hi all,

can anyone give me some advice how can I diagnose and repair this issue. After I installed Ultimate Atari Video from The Brewing Academy I get mostly one sweet, sharp as sharpen knife picture (just awesome), but occasionally (every 10-20 power cycles) picture is just trash.

It is not a big problem, usually just takes single power cycle to return to normal.

So, the problem surfaces only occasionally when I turn on computer.

IMG_20200302_183109.jpg

IMG_20200302_183434.jpg

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My guess: the TV , not the computer. I might be wrong, but that it is an easy test if you have another monitor.

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I'll second that.  Looks like the TV is not properly synching to the Atari signal.

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Holly crap, I think you are absolutely right. Tried to turn off TV and back on. Bingo, of sync picture on first try.

Thanks!

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16 hours ago, Nolium said:

Holly crap, I think you are absolutely right. Tried to turn off TV and back on. Bingo, of sync picture on first try.

Thanks!

 

If you want to use this monitor / TV anyway, then change of the 500k color pot (lower left corner of your 800XL) might be worth a try. Sometimes after warming up these pots are changing their resistor significantly and this also forces some monitors / TVs to make a wrong colored picture like in your 2nd picture. It´s a standard pot, 500k, linear, 10mm pitch. Take a closed case one like Piher PT10 or so. It´s just a buck or less.

 

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