I just bought a new display for my i9505, the item was guaranteed a genuine super amoled lcd screen for samsung i9500. I mounted it with no problem, put the phone with the new screen next to another i9505 with a known original super amoled display and turned both on at the same time. They both lit up,, but I immediately noticed that on the new screen, blacks in the boot logo are not nearly as dark as on the original, as pixels do turn on to draw black colour, while on the original display they don't (that is how all super amoled displays work, don't they?).
I reported the problem to the seller, who claims that the lcd is absolutely a genuine, original Samsung super amoled display for i9500, and that the reason why it behaves like that is that the screen is actually meant for i9500 and it is not compatible with i9505.
I did a little search, but i found nothing about the matter. Is there a possibility that the display may actually be a super amoled, and that due to some known incompatibility with i9505 it is under-performing, as if it was a normal lcd (not super amoled)?
Besides this, the screen works fine.
I'm asking your help because I'm in a dispute and would like to understand if I am wrong.