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The phone stopped working after a factory reset

After the factory reset, the device completely stopped working and would not turn on.

⟐ Edited January 05, 2026 at 18:20 MST

I have a Sony Xperia Z5 Premium that died on me a few months ago. I was planning on keeping the phone and going on a sim only when my contract renews in June. Reason being, phones haven't progressed enough past this stage for me to warrant an upgrade.

However, the phone decided to turn itself off and upon turning it back on it stayed on for 10, 20, 30 seconds or so and then turned itself off again. This continuously happened. I managed to do a factory reset in the time it stayed on (plugged in but this didn't always help). The factory reset made no difference.

My theory is one of two possible causes;

1) It's shutting down due to overheating. It gets warm where the processor is, nothing new for this phone and not as hot as it gets when running something processor heavy. possibly just start up warmth.

2) The battery is knackered. It's been replaced once before but I can't remember why I had to do this.

Also, the rubbery compound found on the copper pipes underneath the processor is just that, rubbery. Should this be more like a paste?

Really don't fancy wasting money on parts if it won't fix my phone.

Any help, much appreciated.

Thanks,

Dean

⟐ Answered February 03, 2025 at 7:07 MST

⟐ Answered January 31, 2024 at 16:22 MST

Ah no... thanks I tried that earlier as well as now but again I have to squeeze the corner to get it to stop being black :s or wait I guess... I think I have finally located the sensor!

I think it's at the top there on the motherboard...not sure how I'm going to adjust that if needed :s .

⟐ Answered October 13, 2023 at 4:14 MST

any ideas

⟐ Commented March 06, 2023 at 20:41 MST

⟐ Answered August 30, 2022 at 0:03 MST

my Xperia Z5 premium doesn't turn on, and the red led flashing while plug the USB cable.

force restart and power with volume keys not work.

also, tried to use Xperia Companion but unfortunately my phone not able to contact with the PC.

do anyone has any idea about what's happening?

⟐ Commented July 21, 2022 at 12:44 MST

⟐ Answered April 19, 2022 at 3:48 MST

Things I've done:

[Power button + volume up]

- vibrates 3 times

- red light (turned blue the first few times)

- shows SONY XPERIA white screen

- shows battery screen + charging sign on top of the battery thing but it doesn't charge, no battery percentage shown

[Yellow button + removed SIM card and memory card]

- red light

- shows SONY XPERIA white screen

- shows battery screen, no charging sign but battery percentage is shown (0%), not charging

- no light while plugged in

now..

- red light

- SONY XPERIA white screen

- no light

- red light

- battery screen + charging sign, no battery percentage, not charging/battery not filling up

- screen goes blank, no light

- this keeps repeating while the phone's plugged in

⟐ Answer edited August 19, 2021 at 18:26 MST

⟐ Commented January 12, 2021 at 8:29 MST

⟐ Commented November 22, 2020 at 16:46 MST

Xperia z5

Not on the sim tray

Iv got that out

I didnt know what it was for

⟐ Commented November 15, 2020 at 18:35 MST

my phone dropped and the glas broke so also the touch didnt work anymore properly. I bought an replacement screen on aliexpress.com and built it in and the screen shows only at the beginning green lines and then a blank screen, only backlight. After a few seconds the red light starts to blink 3 times and the phone restarts with the same procedure.

I tried to switch then my broke screen to test it but while i have dissassembled it there are a lot of glass pieces got away from it so i think the original screen also dont work. But what could it be that the new screen does not work? Because the seller guarantees me that its tested and worked before it was shipped.

Anyone had the same problem after the screen replacement?

Thanks, stanley

⟐ Answered November 11, 2020 at 8:42 MST

Suddenly, I noticed that the phone’s screen became very dark. I needed to put the phone near by a bulb light to be able to see what is on the screen as this made the phone increase the light of the screen. At the same time the phone was very hot although it was not charging (not connected to a charger). I tried to reset the phone however, I noticed that the phone is heating more so I opened the phones cover and disconnected the phone’s battery. I waited few minutes until the phone cooled down then I connected the battery. at this point something started to burn inside the phone. some smoke came from under the metal plate where the red arrow is pointing to in the uploaded photo.

I believe there is a burn mark on the back of the removed little cover. It can be seen on the second and third images.

Does anyone know what I need to do to repair the phone?

Thanks in advance

⟐ Commented October 27, 2020 at 13:23 MST

⟐ Commented September 15, 2020 at 2:41 MST

⟐ Answered July 13, 2020 at 3:47 MST

Phone vibrated once and went blank.

I have left it on charge but no luck.

I have pressed the off button in the sim card tray for 30 seconds and also for 120 seconds. Left it to charge overnight. Still no luck

Any ideas

⟐ Commented June 02, 2020 at 20:16 MST