vorob wrote on 2022-09-06, 19:09:
Maybe this is a coincidence, but I played on a laptop, and there was an electric kettle nearby. At some point, a relay clicked in it and for a second I saw artifacts. The laptop is powered directly from 220 volts, maybe it's interference from electric stuff?
The fact it didn't move at all from that position on the screen really does indicate the panel itself has a problem, it could be a backlight issue if its a LED panel or it could be loose/dirty contacts on the ribbon connecting the panel to the motherboard.
At worst its the LCD itself with dead/dying or damaged pixels, has the screen ever taken a hit to that area ? its pretty close to the area where the lid catch would be, might be worth investigating if the catch isn't placing too much pressure on an old panel.
vorob wrote on 2022-09-06, 19:09:
Maybe this is a coincidence, but I played on a laptop, and there was an electric kettle nearby. At some point, a relay clicked in it and for a second I saw artifacts. The laptop is powered directly from 220 volts, maybe it's interference from electric stuff?
sounds like the power lead needs a ferrite core on it to filter input voltage.