Oxidized component? Kindle doesn't work. Photo

My Kindle paperwhite 7th doesn't switch on anymore.

I opened it and on the flat cable that seems to go to the display, one of those small components had some kind of dust like oxidation, that I've tried to remove. Also when I try to charge it or switch it on, exactly that faulty component gets really hot. I don't know if this is related, because also before I would sometimes feel the back of the kindle slightly warm in that position on the back of the cover, but it would still work.

Also a few months ago the battery started to drain really fast. I changed it, but same Beauvoir with the new one.

If I put it to charge the white led backlight switch on all around.

If I try to reset it the orange bottom light blinks but nothing happen. I don't know if it's because nothing happens, or it actually restart but the screen doesn't work.

I would like to fix it but I don't know how.

Maybe getting a second hand screen and cable replacement? But it might not work