Galaxy s2 damaged screen ?

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Before two days my Samsung was on a repair in shop becouse the home button stoped working , they fixed the buton but as soon i came home i noticed a white spot on the screen that is visible on stronger light . The spot was not there before "fixing" and ppl in shop say that they didnt damaged my screen and dont want to do nothing about it . I need a screen replacement right ? What dmged the screen like that ?
By ognjen123 at 2012-03-21

This is the galaxy s i9000 S1 FORUM bird brain go post this in the gs2 forum

Ups O.o sorry im sleepy and clicked wrong link . . . But dude , u are rude . . . thanks anyway