My iphone screen wont turn on after being replaced 3 times and all ribbons are connected properly

hello ,
i bought a iphone 3gs off my friend only to find multiple problems with the phone !!
i had to change the audio jack replace all buttons , replace the digitilizer and home button .
i did this all with no problems , the only problem i could not fix was the screen keep going blank while using the phone .
i replaced the screen and the problem still persisted , so im pretty sure there is a lose connection some where ,
i had a further look into the problem today only to find that when my friend previously changed the screen he has damaged the logic board where the lcd is connected which is undoubtably the reason for a lose connection .
how do i go about replacing the broken part ? or have i been bumped off and now have to replace the whole logic board ?
many thanks

Try unplugging from the computer then pressing and holding the home button, while pressing home button plug it back into the computer and hold until an itunes symbol shows up. If after 60 seconds it doesn't show up try taking into an Apple store for replacement. If it does show up look in itunes and restore iphone.

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