Your description is not clear. Did you replace the screen and everything was working? Than you dropped it again and it started behaving like this? You are also saying it is boot looping but it won’t even power on?
The most common causes for the phone to boot loop after a drop are.
· Damaged front flex assembly. Disconnect this and see if the phone fully boots.
· Faulty battery. Check the battery connector is sitting flush. You may need to try another battery.
· Faulty charge port assembly.
· Faulty screen.
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· Needs a software update.
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It will most likely be a parts problem I would start with the front flex assembly.
Your description is not clear. Did you replace the screen and everything was working? Than you dropped it again and it started behaving like this? You are also saying it is boot looping but it won’t even power on?
The most common causes for the phone to boot loop after a drop are.
· Damaged front flex assembly. Disconnect this and see if the phone fully boots.
· Faulty battery. Check the battery connector is sitting flush. You may need to try another battery.
· Faulty charge port assembly.
· Faulty screen.
It will most likely be a parts problem I would start with the front flex assembly.