Screen flickering on Atari STe (not PSU-related)

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theimann
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Joined: Tue Aug 01, 2017 1:00 pm

Screen flickering on Atari STe (not PSU-related)

Postby theimann » Tue Jul 17, 2018 2:07 pm

Dear Atari Community,

Two of my Atari 1040 STe run into screen flickering issues after 5-15 minutes.

I suspected defective capacitors on the PSU and replaced both of them with recapped replacements, but that didn't fix it. I spent a lot of time researching the web for answers, but to no avail. I'm using a SCART connection to my LCD TV, but I am pretty sure that the problem needs to be fixed on the ST side since the issue seems to be heat-related.

Here's a video of the behavior: https://www.youtube.com/watch?v=5u0oJZwflaA

It starts with the screen flickering every few seconds, then the frequency increases and eventually the screen breaks down.

The only idea I have left is checking the motherboards with a laser thermometer or use cooling spray (is this even safe?) to locate the faulty component.

Your advice is most welcome - please help me get my beloved STEs back in working order :)

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