Chosen Solution
I was changing the screen as i have many times and ater i got all done the phone will not turn on I had the battery disconnected while working on it but it will not turn on Phone does not buzz when called straight to voicemail
There are, of course, many things that could have caused this. A few common reasons could include: • Improperly seated display connections to the logic board • Damaged flex cables / bad digitizer connections - this is common • Logic board short due to electrostatic discharge or otherwise, caused by various issues - ground yourself! • Faulty replacement display assembly - very possible if a cheap aftermarket screen was used • Bad/dead battery (try connecting the charger with the display attached and boot. Wait a minute or so and attempt to use the mute switch; this should give away this issue I would need a bit more information as to how this repair was performed to formulate a better answer, however, these are some common occurrences! Best of luck to ya!
try reattaching the old screen to determine if phone is still working, a whisker of solder or anything conductive can easily short something out. if all works try the new screen and boot in sequences like screen only, screen and digitizer, screen, digitizer and finger sensor, etc. isolate if that is causing your issue. examine the connectors and cables for damage or bent pins on screen and main board
