What do I do I have a Samsung s3 and last night my phone was working but the next morning the phone just went blank.the won't work.i have asked for people they can't fix it. Plz help

Before buying anything, back up your S3 data using Samsung Kies. Then do a factory reset.. followed by a data restore..
firmware updates can cause problems until the handset is reset, as parts of the previous firmware are still in use..
You should notice an improvement after this... mine went from half a day, to almost 2 days usage, just by doing this after a firmware update.

Ask those who did screen replacement.

Have you tried the last 4 digits of your phone number? Its usually a good place to start and is a default security passcode. You may need to contact you service provider for more help.

maybe your battery or your phone os .... try a new battery if nothing happens... try re flash your phone

hi i have a problem on samsung shw m110s ..i cannot see any display but its working ..what shoul i do?
pls help

same problem, broke my screen, ordered a new screen off ebay and replaced it. now it works fine most of the time but sometimes external display freezes. sometimes goes black, sometimes goes multicolor pixelated (full screen, in blocks, or lines) when this happens sometimes touchpad still works, others not. removing battery usualy temporarily fixes.

mymomcallsme solution works, I had the problem, removed battery fer a while, viola! Screen is back. Thanks mymomcallsme

take it and have it check the speaker may need to be replaced

try to check the B+ line voltage. Check the FET and resistors on this line.