aha2940 wrote on 2020-08-11, 04:55:

Now, I know these pixels can be "massaged" or fixed using a rapid color changing video

The key point here is "sometimes". Sometimes they can be unstuck this way, but there is absolutely no guarantee.

You can try to run a video game with very rapid motion and changing colors. DOOM, perhaps.

In general you'll be stuck with that pixel, there is a hardware fault that most probably is there to stay.

I mostly collect old laptops and to be honest, I suggest to stop caring about such defects 😀 old small LCD panels are often expensive (because they are usually also used as replacemement parts for industrial machines or medical equipment) or difficult to get, and just having a working one is a great thing.

I have fixed a stuck pixel before with the rapid color changing method many many years ago... but it's more luck than anything.

There's a screen saver included with some linux distros (I can't remember which one I saw it on) that's intended for this kind of thing. But I don't remember (and can't find in a web search) what that screen saver was called, and I'm doubtful that it's feasible to get much of anything graphical in linux running on a 486.

I used it to try to cure burn-in (image retention?) on a desktop LCD monitor. It only worked temporarily. Turns out that panel just wanted to burn, and kept "re-burning" itself if I left it sitting for very long at all. So I gave up on it.
I've never tried it on a stuck pixel.

As I recall it worked by displaying a high contrast pattern of black and white lines that flashed so rapidly it was hard to look at. I wonder if anybody ever wrote a DOS program that did this. If not, then maybe some obnoxious demo exists that would have the same effect.