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[Q] Phone doesn't turn on - it only vibrates when battery is in

Hi to all,
2 days ago my phone just suddenly didn't want to turn on (before that it was turned on, with full battery, working normally - but after 2, 3 hours in a car /there was not direct sun, humid, etc../ it did not want to turn on).
When i put battery in the small light on the bottom of the phone starts to shine (it also changes colours to green, blue, yellow...) and phone keeps vibrating. If I hold power button for approx. 10 seconds than it stops vibrating. But the screen is black and nothing else changes.
I also did not install any updates or anything.
What could possibly be wrong?
p.s. when I try to connect phone with USB to my PC it recognizes that the phone is connected to the PC, but I cannot access to my personal data or do anything in Xperia PC programme..

Pc companion - repair? If repairing it doesnt work, you should ask sony service.
Sent from My Awesome Paradox ST21i

Xperia Miro doesn't start? Whats wrong?

Hi Folks,
a friend gave me an Xperia Miro. I sould change the glass.
So i tried to turn on before change: nothing happend.
I changed the glass, tried to turn on: Nothing
Xperia on the charger for 2 days: LED blinks steady red (about 1-2s between blinks).
So i thought it was the battery - bought a new one.
Battery loading: Battery gets warm (!?!) but still nothing happens.
Tried hard reset (vol up & power) LED turns blue steady (while connected to Powerplug)
As i plug off, the LED stopps. When trying to turn on: nothing happend.
Another few hours of Charging (always stock cable & loader): After turn on 3x red for 10s. Afterwards red 1x each 1-2s.
Tried to connect to PC & SPCC: No connection - phone not detectet.
Phone was never rooted or similar.
Is there any trick left? Is this a known issue? Warranty is over - he said it worked before screen change but he didn't use it for months.
Thanks,

[Q] Xperia J Won't Turn On

Hello. Recently the screen on my Xperia J cracked and then the LCD died so I replace it but it still wont show. Try to turn it on, it vibrates and the top led shows a dull blue and nothing on the screen. I tried to reinstall the firmware with the Sony Companion with finished but still nothing. Tried flashtool after that with the same result. If I plug the charger in the led turns green.
Please help.
Thanks

Huawei Y6 (SCL-L01) Black Screen

Hello, my Y6 had discharged battery completly, it didnt want to charge but after few tests with chargers it does charge now (yellow diode).
But when i want to boot it up screen is always black without back light like its disconnected but it isnt. Phone vibrates and connects to PC succesfully even in recovery mode but i can't fix black screen issue screen is perfectly fine without scratch. Sometimes it plays boot music but no logo on screen.

Dead phone, red charging light & start up screen loop after dropping it

After dropping my XZ on a table, it just went completly dead. The device switched off and wouldn't start again. So I tried to charge it, and hoped for the best, but when I connect it to a charger something strange occurs. The small red charging light comes on, and the black "SONY" text on a white background shows for a few seconds, then the device shuts off and the red light disappears. And from there on it just loops from black screen to red light -> sony logo -> black screen no red light -> red light -> sony logo -> black screen no red light and so on.
I've tried 2 different chargers (for several hours), tried starting it holding vol up and also starting it holding vol down. Tried connecting it to a computer with the xperia companion software, but it doesn't show any signs of connection. The SD card is removed.
I assume it has to be some kind of hardware issue (relating to the drop, yes i was drunk). But does anybody have experience from this problem and might advise what part is broken?

What you actually did with your mobile, step by step.