According to your sounds, phone is dead now. so you should check below steps
1) Change the battery and check, if you found same issue
2) Check the micro USB port
- Is there any damages? if yes - replace it and check
- is there no damages - re solder the port and you can check : 1 and 5 pins should receive 5V DC
3) if non of above not works, you should have to replace power management IC (PM8901)
Below video will help you to do that : Note: BGA re-working skills required
https://www.youtube.com/watch?v=1qjmUHSx...
-**** Happy to HELP to sri lankans ****
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