Two things: a repaired 3090 24gb can be sold for 1000+ euro in Germany at least. It's still crazy expensive, so if you have the skills and devices, it can be done with a profit when you buy 3 broken cards and can sell 2 repaired one.
I never reballed any IC, so I would not dare to try it on my card.
I never reballed any IC, so I would not dare to try it on my card.