iPhone 4 Screen replaced - But still not working fully...

hi,

friend had temper tantrum girlfriends phone , lobbed @ wall. had @ it, cover cracked , lcd displayed nothing @ all, no backlight, etc. if attempted power on , pressed buttons locked keys keypad would vibrate after pressed 4 digits.

assumption therefore lcd/backlight had gone , rear case/cover needed replacing.

ordered replacement screen , cover have turned up.

fitted iphone 4 screen (i've done 1 sucessfully before) , powered phone on. powers on white screen. can make out lettering. can screenshot pictures (quick press on home button , lock button), lock , home button responds. if attempt sign phone don't silent keys, button tones if dialling number. can think isn't registering side swipe , instead putting emergency call function? in either case screen white.

here's have tried far:

• reseated battery
• reseated connections
• tried holding down lock , home button 30 seconds
• tried different battery known working iphone 4
• tried @ phone in itunes says locked

i'm out of ideas now, unless lcd ordered faulty?

suggestions?

thanks.

 

generally white screen either means lcd faulty or there damage logic board. phones in white screens it's not lcd. however, way described damage, it's possible there problem board.

 

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