Sudden Death Z3

[Nytoria]

Hello all,

For some strange reason my phone died on me friday, the last time i saw it on was while updating.
It wasn't charging at the time so i thought maybe the battery ran out, but when i connected it with the charger my phone wouldn't boot correctly.
My Z3 was in a bootloop, it could still be detected by my pc but i couldn't do anything due the fact it was turning off and on all the time.
I tried to enter recovery mode but it instantly restarted itself...
Pc Companion wasn't detecting my phone so i couldn't use that.
since my phone did get repaired already (my screen broke) i could manually disconnect the battery but that didn't work either, i tried a new battery too but to no succes.
I also tried all the button combinations, the only mode i could enter was fastboot mode (blue led) and it would stay on but still no sign of a normal booting process.
The yellow button near the sdcard slot didn't work either.
When i put my phone to charge at the wallsocket the led stays red and it won't reboot all the time, but after 15 minutes the red led disappears and it seems like the phone isn't charging at all.

Today it got worse, my pc can't detect my phone anymore and the bootloop stopped too, the led stays red when charging (usb and wallsocket) but after some time the led disappears.
I can't enter fastboot mode anymore.. plainly said; nothing works anymore.

Anyone knows how to fix this problem?
Sony doesn't want to repair it for me since i fixed my screen externally so i hope for solution

 

[shivasrage]

I had a similar behavior on a Xperia T when my battery was deeply discarged.
There was No way to load the battery inside the phone.
The phone has to start the bootloader or something like a "mini kernel" (dunno how it is called exactly) to start the loading sequence.
If you are under the -normally not reachable- minimum volatge (under normal conditions phone turns off before) there is too less juice to turn on the booloader and start the loading.
In my case I opened the phone put out the battery and charged it directly with a power supply by wire.
For me it worked.
I see you write that you tried other battery was this one full for sure.?
regards

 

[Nytoria]

I had a similar behavior on a Xperia T when my battery was deeply discarged.
There was No way to load the battery inside the phone.
The phone has to start the bootloader or something like a "mini kernel" (dunno how it is called exactly) to start the loading sequence.
If you are under the -normally not reachable- minimum volatge (under normal conditions phone turns off before) there is too less juice to turn on the booloader and start the loading.
In my case I opened the phone put out the battery and charged it directly with a power supply by wire.
For me it worked.
I see you write that you tried other battery was this one full for sure.?
regards

No i'm not sure if it was full, but i can try to reload my battery the way you suggested.

 

[shivasrage]

No i'm not sure if it was full, but i can try to reload my battery the way you suggested.

I assume that you know that... but nevertheless
I advise you to be very careful with li-ion batterys the
are very sensitive with charging voltage.
There are some tutorials on youtube but do it on your
own risk I´m not responsible for anything...just saying.

Edit: for safety...I think it would be good to try to load the
li-ion battery only that much that it has enough power
to boot in the loading state...then put the battery back in the
phone and load it the normal way.

I wish you a succsessful charging let me know if it worked.
good luck :fingers-crossed:

 

[Nytoria]

I assume that you know that... but nevertheless
I advise you to be very careful with li-ion batterys the
are very sensitive with charging voltage.
There are some tutorials on youtube but do it on your
own risk I´m not responsible for anything...just saying.

I wish you a succsessful charging let me know if it worked.
good luck :fingers-crossed:

Thanks for tip and i'll let you know :fingers-crossed: