If the display works, that's not a failure yet. You can also see this effect on LCDs by pressing on the surface but we only demo that on failed LCDs as we don't want to bruise them. New LCD panels usually clear this right up.
there are a few stains in my lcd, I bought it 2 days ago and i assemled it myself. This stains move, merge and decompose ( stains' last locations are restored) or they just disappear and appear because im not sure but this happens in a loop for a long time.I ordered this lcd model N173HGE-L11 but seller posted HSD173PUW1 i dont know if it matters.
So are they dead pixels or stuck pixels ? Or a lighting problem in lcd ? Maybe, i have broken something while assembling it