xperia z5 premium won't boot up stuck on sony logo. - Xperia Z5 Q&A, Help & Troubleshooting

hello,
when i was charging my phone, suddenly display goes off slowly and red link blinks.
after facing this problem for like 4-5 mins, my phone doesnt boot up
whenever i turn it on sony logo appears and after few seconds it goes off and red light blinks 3 times and then stay red after 3rd blink.
i tried repairing it with sony companion (2 times) nothing worked.
but one night battery was drained completely because i left it with red led in a box.
and after few days i put it for charging and it booted up normally and after few mins it shutdown,
and on the next morning i tried to turn it on , it booted up and then it got hanged and then again shutdown with red light blinking.

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i dropped my Z3 too, no damage at all, but it doesn't work at all anymore. No red lights nothing.
aaapje15 said:
do the 20second reset. this simulates a battery pull.
i dropped my Z3 too, no damage at all, but it doesn't work at all anymore. No red lights nothing.
Click to expand...
Click to collapse
already tried, nothing ...

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