Broken iPhone

[grilledcheese]

i haven't used my iphone for a month and it's been dead. when i tried to turn it on by charging it to the wall for 12 hours it's not turning on. i started to search for some solution on the internet and i tried the power button-home button solutions and it's still not working. i brought it to a service counter after charging it for full 48 hours, they tried to replaced my phone battery with a brand new battery, and i just got a call that it's still not working. what should i do? my phone have been through services before, but it's screen service. does it affects my battery?

 

[beernut]

maybe it's the screen that's having an issue? Have you tried plugging into computer and see if it gets detected?