[HELP] Some part of the screen is not working

The problem started when i borrowed my friends charger i think it's a galaxy duos? after i plugged the charger into my phone? it didn't charge so i removed it? after that, the lower part screen of my phone is not working anymore? please help. i've already done a full wipe and, downgrade to 4.4.2. from 5.0.1. still the problem persists it's driving me crazy. :(

http#i.imgur.com/O07JAdv.png

replace the # with a dot(.) to see the picture... can't post outside links :/