Why can't my phone turn on?

It wont open for 2 months so i still cant use any phone right now im using my computer plz help maybe i because my cousin borrowed my adoptor t5hen i found a soccet that could fin in the charger mine maybe ruined the battery or what ....last week i tried to charge it then i wited bit to turn on then i chrage it into 100% thern in the night its 30% only and i tried to charge it then after 15 minutes i looked a it then it is only 7% why plz make any solutions for that it would help me alot....thank you

The logs keeps coming up

"your phone battery needs to be waken up when using a universal charger or probably you need to check on the battery terminals of the phone

Update (06/01/2016)

there's no display card , you will just need to buy a new board buying a new board is like buying a new phone"