Chosen Solution

Had my phones LCD replaced a couple of days ago. Phone lasted about a day working fine then it just went black. tried all the resets etc. took it back into them, they held onto it for a day and told me everything looks perfect inside the phone. they have tried new batteries, lcd etc but nothing works. phone is showing no life whatsoever. any clues as to what it could be? and would it be the stores fault? (could they have damaged something) please email me if you have any helpful info! Thanks in advance

well probably when they were replacing the screen they pulled one of the cables to far back and it may of been disconnected did they already try a new screen