Why am I getting weird artifacts?

I call this effect pixel lice as the video buffer RAM is failing or there is noise within the T-CON board.

The different model series use different memory setups. In the Intel models we have either iGPU (Intel CPU graphics) or dedicated GPU's mostly AMD these days.

The Intel based systems carve out a bit of main RAM as the buffer space and within the AMD models dedicated RAM.

Now to make your head spin! The AMD chip isn't used during startup and only pressed into service when a given App calls for it. With nothing running other that the OS will be using the Intel graphics so if you are seeing pixel lice just within the desktop that's a bad T-CON board. If you see the pixel lice when running a heavy graphics game or task like video editing that's a dedicated RAM failure often it's a bad solder joint on the RAM chips.

Of course the T-CON is often where the failure is, as it's part of the display within the lid or just dangling as in this series there is not much you can fix. If you have some spare parts you might be able to replace if you can identify the failed component. It's both simpler and cheaper just replacing the display.