semi working blackberry 8520 curve for spares or repairs ?

im selling my sisters blackberry for her for spares or repairs the phones purple has usage marks but bear in mind its a 18 month old phone the phones unlocked and you can still call on it problem is the screens gone white after being dropped off the table before this the phone was working fine apart from the scroller sometimes froze she didnt get it repaired because she has no insurance so gave it me to sell for her mite be a cheap fix if you know what your doing as i havent got a clue 30 call me