Database Develop

[Q] Is my Xperia lt30p Bricked?

Getting an orange light (not flashing and its been on since yesterday). Wont turn on in any ways, by presing volume up and power for several seconds(i tried for minutes) or pressing down and power. Not even connecting it by USB, i tried many USBs and a laptop+ computer. This phone is just about 2 weeks old and lightly used, because I'm using my old phone.
This phone as never been dropped, hit, left without charge, or watered. So I am really surprised of the quality. I bought this phone in the US and moved to Costa Rica so i cant just send it back. This really annoy me, to think that i wasted 539.00 dollars in this "Quality" product that lasted 2 weeks.
I read some solutions like leaving it charging for a long period of time. Or if that doesnt work, drain the battery. But i think the later is impossible since the battery is fully charge, it would take weeks for the battery to run out (how do i know it is fully charged?, my nokia charger gets hot while charging and it is totally cool charging the xperia), and flashing, but my computer does not recognize the phone even by pressing volume done for several minutes and power.
Please any help? thanks!.

Xelestial01 said:
Getting an orange light (not flashing and its been on since yesterday). Wont turn on in any ways, by presing volume up and power for several seconds(i tried for minutes) or pressing down and power. Not even connecting it by USB, i tried many USBs and a laptop+ computer. This phone is just about 2 weeks old and lightly used, because I'm using my old phone.
This phone as never been dropped, hit, left without charge, or watered. So I am really surprised of the quality. I bought this phone in the US and moved to Costa Rica so i cant just send it back. This really annoy me, to think that i wasted 539.00 dollars in this "Quality" product that lasted 2 weeks.
I read some solutions like leaving it charging for a long period of time. Or if that doesnt work, drain the battery. But i think the later is impossible since the battery is fully charge, it would take weeks for the battery to run out (how do i know it is fully charged?, my nokia charger gets hot while charging and it is totally cool charging the xperia), and flashing, but my computer does not recognize the phone even by pressing volume done for several minutes and power.
Please any help? thanks!.
Click to expand...
Click to collapse
Have you flashed anything to the phone? I cant beleive it just did this without you doing something to the phone. Have you rooted? Have you tried to unlock the bootloader?
Please install flashtool and post the log from flashtool when you try to connect the phone normally, in flashmode and in fastboot mode.
PS,
Now you have asked your QUESTION and I have tried to ANSWER it, can you guess which section you should have posted in?
General, Question & Answer, development or themes and apps?

gregbradley said:
Have you flashed anything to the phone? I cant beleive it just did this without you doing something to the phone. Have you rooted? Have you tried to unlock the bootloader?
Please install flashtool and post the log from flashtool when you try to connect the phone normally, in flashmode and in fastboot mode.
PS,
Now you have asked your QUESTION and I have tried to ANSWER it, can you guess which section you should have posted in?
General, Question & Answer, development or themes and apps?
Click to expand...
Click to collapse
I swear i didnt touch the phone i barely installed any apps like facebook, waze, and prolly one or 2 more. The reason is because i was waiting for my sim cutter and for the mean time i was using my old c6-01 nokia. I tried flashboot and it keeps telling me device not detected. i tried pressing volume down and power, etc. To be honest i barely used this phone. Just to check my FB or waze (like a google map). I moved to Costa Rica so i cant send it back.

Thread moved. Please post all your questions here in Q&A in future.
Thanks
AvRS

Xelestial01 said:
I swear i didnt touch the phone i barely installed any apps like facebook, waze, and prolly one or 2 more. The reason is because i was waiting for my sim cutter and for the mean time i was using my old c6-01 nokia. I tried flashboot and it keeps telling me device not detected. i tried pressing volume down and power, etc. To be honest i barely used this phone. Just to check my FB or waze (like a google map). I moved to Costa Rica so i cant send it back.
Click to expand...
Click to collapse
ok, if you have not unlocked your bootloader you can not enter fastboot mode.
Download PCcompanion and follow the instructions to update software, then click on repair. It should work.

gregbradley said:
ok, if you have not unlocked your bootloader you can not enter fastboot mode.
Download PCcompanion and follow the instructions to update software, then click on repair. It should work.
Click to expand...
Click to collapse
Bootloader? havent tried that. tried the PCcompanion but its not detecting my phone, even pressing volume down+power. Ty for the reply!

Xelestial01 said:
Bootloader? havent tried that. tried the PCcompanion but its not detecting my phone, even pressing volume down+power. Ty for the reply!
Click to expand...
Click to collapse
Please dont worry about it. Just go through the process to update your software without actually attaching your phone. Then you will get an option to repair.
Then attach the phone in flashmode (Press volume doen whilst attaching the usb cable to the phone) and it should work.
If not, please download flashtool Find a link in the first post of the Devlopment section and also download a stock ftf for your phone from the all in one thread (First thread in the Q&A section)
Then drag and drop the ftf file you downloaded into the open window of flashtool and attach the phone in flashmode. If that does not work then please post what the log of flashtool says.
EDIT
Also, no need to ever say thank you to anyonr here, if you feel the need to offer your thanks just hit the thanks button, thats what it is for

AvRS said:
Thread moved. Please post all your questions here in Q&A in future.
Thanks
AvRS
Click to expand...
Click to collapse
Sorry for posting in the wrong section!.

gregbradley said:
Please dont worry about it. Just go through the process to update your software without actually attaching your phone. Then you will get an option to repair.
Then attach the phone in flashmode (Press volume doen whilst attaching the usb cable to the phone) and it should work.
If not, please download flashtool Find a link in the first post of the Devlopment section and also download a stock ftf for your phone from the all in one thread (First thread in the Q&A section)
Then drag and drop the ftf file you downloaded into the open window of flashtool and attach the phone in flashmode. If that does not work then please post what the log of flashtool says.
EDIT
Also, no need to ever say thank you to anyonr here, if you feel the need to offer your thanks just hit the thanks button, thats what it is for
Click to expand...
Click to collapse
If this helps, the phone is an unlocked version i bought from Amazon, I was using micro Sim card from a local company and it was working fine. I will try the tips you recommended me later when I am out of work.

Disconnect the battery, u have to take the back off. 1 screw behind the sim cover.
Sent from my LT30p using xda app-developers app

erhan12 said:
Disconnect the battery, u have to take the back off. 1 screw behind the sim cover.
Sent from my LT30p using xda app-developers app
Click to expand...
Click to collapse
I took the screw out... But how do u remove the back cover again?.

Theres a thread somewhere which shows a disassembled xt, search.
Sent from my LT30p using xda app-developers app

Hard brick LT30p ?
Hello to all... What could hapen to my phone, that it wont turn on? Hard brick? Everything was fine, I just searching on the webs ho to sim-Unlok, found sites, gived IMEI and they tell the price, and just searched some other to get the price (where is cheeper). Some days ago I tryed to flash stock rom O2 with flash tools from here http://forum.xda-developers.com/showthread.php?t=1910216, everything goes right. Version was 4.0.4 and I do not update (when I connect to Wi-Fi it gives me update) because I thought wen I sim-ulock then I do this. After flashing stock rom I noticed, that my sony wont start without restart (press power + volume up + volum down) (maby goes in to deep sleep or something). I thought never mind, it maybe softwere problems and when I debrand it will goes everything ok, because I rewrite software and add my sim when sim-Unlock I do. And when I decided to debrand, it is to day, I see, that I can't turn on my phone. PC do not detect and no sign at all. Trayed to hold all butons and so on, nothing... What hapens? Yesturday I was using it without SIM (because it is still simlocked) to search on the internet, google and everything was OK, power left about 60% when shutdown. So any ideas how to start the phone? The phone was not rooted. Maby some how something block my phone with IMEI? Because I write it in some forums asking for sim-unlock, so just don't know what to do... Any ideas or suggestions?

unrealliving said:
Hello to all... What could hapen to my phone, that it wont turn on? Hard brick? Everything was fine, I just searching on the webs ho to sim-Unlok, found sites, gived IMEI and they tell the price, and just searched some other to get the price (where is cheeper). Some days ago I tryed to flash stock rom O2 with flash tools from here http://forum.xda-developers.com/showthread.php?t=1910216, everything goes right. Version was 4.0.4 and I do not update (when I connect to Wi-Fi it gives me update) because I thought wen I sim-ulock then I do this. After flashing stock rom I noticed, that my sony wont start without restart (press power + volume up + volum down) (maby goes in to deep sleep or something). I thought never mind, it maybe softwere problems and when I debrand it will goes everything ok, because I rewrite software and add my sim when sim-Unlock I do. And when I decided to debrand, it is to day, I see, that I can't turn on my phone. PC do not detect and no sign at all. Trayed to hold all butons and so on, nothing... What hapens? Yesturday I was using it without SIM (because it is still simlocked) to search on the internet, google and everything was OK, power left about 60% when shutdown. So any ideas how to start the phone? The phone was not rooted. Maby some how something block my phone with IMEI? Because I write it in some forums asking for sim-unlock, so just don't know what to do... Any ideas or suggestions?
Click to expand...
Click to collapse
I disassemble my phone, removed battery conetctors and added to the same place and my phone booted without a paroblme. Hmm? Is it sony's problems? Maby exists diferent way how to do that when phone just do not boot? Because if it hapens in the future, it's not so easy to remove back.
Who is trying to remove the back I can say, that the back is from soft (elastik) material, so do not afraid to give some preasure. And offcorse there are only one screw near sim card. I done it slowly from corner to corner to remove.
My simple guide where is back holders https://www.dropbox.com/s/8x2m0plk4c0cibn/LT30p reassemble-1.jpg

Xperia T dead
Hi, I have LT30p( Xperia T ) and it's dead right now.
I tried everything but it's not turning on.
No fastboot, no flashmode just the red light blinks twice when i hold the power button. When it died it was 71% Charged. It hanged and i went to CWM recovery(did nothing) when i chose reboot system, it didn't.
And it was 2 days plugged into wall charger.
and flashtool doesn't recognize it( I Installed The drivers twice )
Unlocked bootloader,CM 10.2( 4.3 )
Can You Help ME PLZ?
Thanks for Helping.

[Q] Xperia T won't boot up..

For some reason my xperia T won't boot up anymore. Its very strange and the second time it happened.
Previous time, after some tries with holding to volume keys while holding the power key, eventually it boot up again, but this time, it
just flashes red. Which means that it is empty. So I plug in the power cable and the red light stops flashing for a second and just turns solid red.
But then it turns off again.
Don't know what to do now. Pc companion obviously doesn't recognize the device since its off.
Last time that I actually fixed the problem, the touchscreen wouldn't work anymore, so I reflashed a very old firmware.
Then it worked again, so I installed the latest cyanogenmod, and had no problems for a few days.
I do think its a firmware issue. I think it actually has to do with the apollo app, or atleast the headphone plug being in use while the phone charges.
I was listening music while the phone was recharging, yesterday, and in the morning this happened. Last time the exact same situation.
Any Ideas? Not planning on spending money right now :fingers-crossed:

Leave it on charge for a long time and then try the hard reset.

okay. I'll try that. Already tried hard resetting few times now.

gregbradley said:
Leave it on charge for a long time and then try the hard reset.
Click to expand...
Click to collapse
Didn't help. Left it recharging for hours, but when I try to boot it, it just gives me a red light that blinks 3 times. Maybe it is the battery or the usb,
but its still weird. Sudden death? Hard resetting still won't work..

quinten96 said:
Didn't help. Left it recharging for hours, but when I try to boot it, it just gives me a red light that blinks 3 times. Maybe it is the battery or the usb,
but its still weird. Sudden death? Hard resetting still won't work..
Click to expand...
Click to collapse
I said a long time....
Lots of people leave it for 24 hours

I absolutelly do not recomend my solution untill everything else failed.
So here it goes:
When my phone was totally unresponssive (soft and hard boot reset failed), i dissasembled the phone and disconnected the battery and what solved my problem. I didn't know it was possible until i did it myself and this is the only reason i'm telling you: it's the very last thing but it's an option!
Sent from my LT30p using xda app-developers app

Moon_Fire said:
I absolutelly do not recomend my solution untill everything else failed.
So here it goes:
When my phone was totally unresponssive (soft and hard boot reset failed), i dissasembled the phone and disconnected the battery and what solved my problem. I didn't know it was possible until i did it myself and this is the only reason i'm telling you: it's the very last thing but it's an option!
Sent from my LT30p using xda app-developers app
Click to expand...
Click to collapse
hmm, I want to try this. I just can't figure out how to open it. I saw a dissasembly vid on youtube, but when I get the first screw out, I can't seem to snap it open.. Im getting a bit desperate. Already went to the store, and they want to charge 45 euro's for a new battery+dissasembly.

Best way is to find the plastic tool it is shown in the video. But i had none so it takes some gentle force starting from the top left and then right to the key point that is the corner . It has to snap a little. Any metallic tools will damage the plastic and will leave traces. The tool might be replaced with a guitar feather if a friend of yours has one
Sent from my LT30p using xda app-developers app

"i'm in the same boat"
I disconnected the battery, but nothing happend.
My phone continues bootloop.

mikewhiteoo said:
I disconnected the battery, but nothing happend.
My phone continues bootloop.
Click to expand...
Click to collapse
with the battery not connected? Wow...
If you are in a bootloop I suggest you have the wrong kernel
Just flash a stock ftf in flashtool

[Q] my xperia x8 turns on and off again and again

Hello everyone.
I just got my xperia x8 from my brother because he didn't know how to fix it.
The phone seems like it has not even a scratch.
The issue is that everytime i turn it on it is just turning on and off and on and off again and again.
I don't even have time to input my pin.
The battery always seems to be drained although i charge it occasionally.
I have updated it's os with pc companion, but it keeps doing the same thing.
Is there anything that i can do to fix it?

Mr Skatosakoulas said:
Hello everyone.
I just got my xperia x8 from my brother because he didn't know how to fix it.
The phone seems like it has not even a scratch.
The issue is that everytime i turn it on it is just turning on and off and on and off again and again.
I don't even have time to input my pin.
The battery always seems to be drained although i charge it occasionally.
I have updated it's os with pc companion, but it keeps doing the same thing.
Is there anything that i can do to fix it?
Click to expand...
Click to collapse
try to flash stock frimware through flash tools(this wipes the data & reinstalls the system partition)
Normally flashing fixes all software fault but if your hardware is damaged so you shouldnt be hopeful.
I think its a sw problem but even an empty battery can cause exactly the same react.(put another battery then try flashtools)
Hope i could help you
Sent from my E15i using Tapatalk 2

Mr Skatosakoulas said:
Hello everyone.
I just got my xperia x8 from my brother because he didn't know how to fix it.
The phone seems like it has not even a scratch.
The issue is that everytime i turn it on it is just turning on and off and on and off again and again.
I don't even have time to input my pin.
The battery always seems to be drained although i charge it occasionally.
I have updated it's os with pc companion, but it keeps doing the same thing.
Is there anything that i can do to fix it?
Click to expand...
Click to collapse
Did he do any modifacations to the software?
If not, seems like a battery problem to me. Anyway try to flash stock rom.
Btw your username is...

stamatis said:
Did he do any modifacations to the software?
If not, seems like a battery problem to me. Anyway try to flash stock rom.
Btw your username is...
Click to expand...
Click to collapse
that's our little greek secret... no modifications to the software but he kinda had troubles with this mobile for the whole period of time he owned it.he didn't receive messages in the particular device as far as i can remember. the battery doesn't seem to have anything wrong though.it is just sliiiightly puffed but nothing that alerting.i mean i havent charged it for a long time and it can still power the mobile's "neverending loop". if there was a problem wouldnt it not turn on at all or something? i don't have an extra battery and i'm thinking of getting through with the flash stock romafter i charge it a bit.. should i? and if yes, how? i've never done that (a guide would be great )

Mr Skatosakoulas said:
that's our little greek secret... no modifications to the software but he kinda had troubles with this mobile for the whole period of time he owned it.he didn't receive messages in the particular device as far as i can remember. the battery doesn't seem to have anything wrong though.it is just sliiiightly puffed but nothing that alerting.i mean i havent charged it for a long time and it can still power the mobile's "neverending loop". if there was a problem wouldnt it not turn on at all or something? i don't have an extra battery and i'm thinking of getting through with the flash stock romafter i charge it a bit.. should i? and if yes, how? i've never done that (a guide would be great )
Click to expand...
Click to collapse
http://forum.xda-developers.com/showpost.php?p=35338935&postcount=2

stamatis said:
http://forum.xda-developers.com/showpost.php?p=35338935&postcount=2
Click to expand...
Click to collapse
links don't work. i found the stock rom. all i need now is flashtools. Working link anyone?

I got it done. i flashed it succesfuly and was able to work with it while connected to my laptop. once i unplugged it, it went off after 2 minutes. Now all i have to do is buy a new battery.Thank you guys. i just got a free x8 from my stupid brother

xperia z turn off constantly!

hello.
my xperia z c6603 (4.4.2)
is constantly turning off!
the problem started yesterday when i was using some app in my phone.
suddnely it crashed and turned off. i tried to power on the phone but it never passed the boot screen.
when i connect my device to a pc,it is working perfect.but if i discconect it, it turns off by itself and wont turn on.
please help!
UPDATE: the phone also working if connected to a charger

visual_boy said:
hello.
my xperia z c6603 (4.4.2)
is constantly turning off!
the problem started yesterday when i was using some app in my phone.
suddnely it crashed and turned off. i tried to power on the phone but it never passed the boot screen.
when i connect my device to a pc,it is working perfect.but if i discconect it, it turns off by itself and wont turn on.
please help!
Click to expand...
Click to collapse
try restoring firmware

androidtweaker1 said:
try restoring firmware
Click to expand...
Click to collapse
tried that also. restored via pc companion but problem. problem not solved

visual_boy said:
tried that also. restored via pc companion but problem. problem not solved
Click to expand...
Click to collapse
try using flashtool to install the firmware

androidtweaker1 said:
try using flashtool to install the firmware
Click to expand...
Click to collapse
can you please provide me with a guide\thread that shows how to do that?

visual_boy said:
can you please provide me with a guide\thread that shows how to do that?
Click to expand...
Click to collapse
there are lot of tutorials in the forum, use the search box

androidtweaker1 said:
there are lot of tutorials in the forum, use the search box
Click to expand...
Click to collapse
it didn't helped.
i found that this problem happend to many people with xperia z(x) smartphones.
you can see this post here:
h x xp://talk.sonymobile.com/t5/Xperia-Z-ZL-ZR/Xperia-ZL-turns-itself-off/m-p/416711#U416711
is there any chance that if i replace the battery the problem will be solved? (i know how to teardown smartphones)

visual_boy said:
hello.
my xperia z c6603 (4.4.2)
is constantly turning off!
the problem started yesterday when i was using some app in my phone.
suddnely it crashed and turned off. i tried to power on the phone but it never passed the boot screen.
when i connect my device to a pc,it is working perfect.but if i discconect it, it turns off by itself and wont turn on.
please help!
UPDATE: the phone also working if connected to a charger
Click to expand...
Click to collapse
Same problem occured to me. i was playing nova 3 on my device when it suddenly turned off. it orked for 15 min after reboot but then again the same problem. It worked normally when it is connected to charger for almost a week but now it is not working on charger also. what to do??? will battery replacement solve my problem???????

Kruns said:
Same problem occured to me. i was playing nova 3 on my device when it suddenly turned off. it orked for 15 min after reboot but then again the same problem. It worked normally when it is connected to charger for almost a week but now it is not working on charger also. what to do??? will battery replacement solve my problem???????
Click to expand...
Click to collapse
yes indeed. i replaced my battery and the phone works great since.
you can find replacments at ebay. good luck.

[Q] Bootloop, software or hardware caused?

Hello, Its been a long time since I don't ask anything on the forum, but in this occasion I haven't found any solution to what's happening to my Xperia Z, I'm gonna do my best to present the issue.
A couple of days ago I updated my Xperia (unlocked bootloader) from Existenz 1.5.5 to the latest 3.0 and the phone was completely fine for 2 days until it started shutting down by itself constantly and with no apparent reason, so I started to get worried, the first thing I did was try and reinstall the ROM thinking that I had some something incorrectly, I has no luck with that, on the contrary the phone died on the middle of the installation and it got bricked. My next step was to try do do everything from scratch, flashing the stock rom 10.5.1.A.0.283 to root it, install recovery and try flashing the Existenz after. I managed to do everything with lots of unwanted shuts downs in the middle but I managed. Unfortunately the phone kept on having the same problem so my last option was to try and use the Sony bridge on my mac to try and make a factory reset but it didn't let me because it detected the unlocked bootloader so I relocked it with flashtool, after that I tried again and it worked, it installed the official stock rom .101 and guess what..... same issue again, when I try to turn the phone on it shows the sony logo and turns off, if I try to turn it on connected to the AC it turns on but if I start playing with the menus and options it disconnects again, ofcourse if I turn it on connected and once it's on I disconnect it it shuts down almost instantly, At first I though the problem could be software, then hardware so I tried to check the battery status in the service app and it said good battery health so now I'm completely lost.., I've found this: http://forum.xda-developers.com/xperia-z/help/hardware-fix-xperia-z-charging-booting-t2760911 but I don't know if thats my case. I was gonna go to a sony store and ask them what could be the problem, but now I'm living in Brazil and it'd take lots of time and money to get ir fixed here.
I really need help here, sorry if I posted on an incorrect place.

I just found a video of someone with the exact same problem, in case in helps: https://www.youtube.com/watch?v=zkvLchJ_0oU
UPDATE: I rooted it, install recovery and once im in recovery it doesn't turn off by itself what tells me that may not be a hardware problem, at least not battery related, all this just makes me feel more confused!!
UPDATE 2: I rebooted the phone to load the recovery again and the battery indication went from 89% 2 minutes ago to 11% this second time, maybe it's hardware after all..

Battery.....
TapaTalked from my Xperia™ Z (C660²) running Ultimate PureXZ Ultra!

I seriously don't think is the battery, I think it's something related to the energy but I'm not sure what. As I said before the battery went from 89% to 11% quite fast but when it was at 1% it stayed there for hours, if it was the battery wouldn't it had turned off? after it finally turned off I left it charging for about 12 hr and today morning I try to turn it on without it being connected and no luck, it kept shutting down after the Sony logo. Sometimes when I turn it on with the cable connected it loads the OS and I unlock the lockscreen, diconnect the cable and extraneously it stays on just with the battery power, I manage to put the ScreenOff timeout to 30 mins and it stays on all the time, as long as I don't do certain things like opening the camera, phone or sometimes it just randomly turns off from anywhere. I know it's not the rom because I've tried 4 different ones including the official installed by Sony Bridge....
If the issue is software related what could it be?? the bootloader? the bios power management? battery stats? maybe restoring TA backup(because I just relocked the bootloader using the option o flashtool, not flashing the TA backup)?
I'm concerned about buying a battery, installing it and seeing no change as I've read happened to some guys with the same problem.
I really like my phone but after this I'm not so sure i'll buy another Xperia because this has happened to so many people and apparently there's no solution, my phone is out of warranty and I life in a foreign country (Brazil) so you guys are all I have...

Same Problem Here ... Impossible to flash either from fastboot or from CWM or TWRP
Hi, I am having exactly the same problem. I was trying to revert to stock kernel from CM10.2 and was following one of the many guides here on XDA. The phone was not passing the «SONY» Logo, and immediately after such logo it simply went completely black and the phone is off. After two days of trying several things, including Fastboot of Stock ROM, fastboot of different boot.img files including Doomlord, using Sony Bridge for Mac, all of which did not solve the issue, the problem now is that when I try to flash any ROM, the flashing operation begins and then after approx 15 seconds the phone goes black and switches off. The battery is at 82%, so I am quite sure it is not a battery problem.
I am more and more convinced that the internal filesystem (or simply RAM) needs to be formatted at low level from scratch.
The only problem is that I do not know how to do it: how to do LOW LEVEL Formatting of RAM? Any instructions out there?
Any other suggestion?
Thanks

gcecchini said:
Hi, I am having exactly the same problem. I was trying to revert to stock kernel from CM10.2 and was following one of the many guides here on XDA. The phone was not passing the «SONY» Logo, and immediately after such logo it simply went completely black and the phone is off. After two days of trying several things, including Fastboot of Stock ROM, fastboot of different boot.img files including Doomlord, using Sony Bridge for Mac, all of which did not solve the issue, the problem now is that when I try to flash any ROM, the flashing operation begins and then after approx 15 seconds the phone goes black and switches off. The battery is at 82%, so I am quite sure it is not a battery problem.
I am more and more convinced that the internal filesystem (or simply RAM) needs to be formatted at low level from scratch.
The only problem is that I do not know how to do it: how to do LOW LEVEL Formatting of RAM? Any instructions out there?
Any other suggestion?
Thanks
Click to expand...
Click to collapse
It seems like there's no solution and I don't think my battery is broken so I won't try the Hardware Fix since I don't wanna break my phone more than it already is, tomorrow I'll try to go the a Sony service store and see what they think the problem is, since I unlocked my bootloader and relocked after I think they will be able to see this, I think it ain't gonna be a problem because my warranty was void long time ago, and it's 1 year anyhow.... I hope they recognize it's a sony's fault issue and they decide to fix it with no cost, very unlikely but hoping is free gcecchini, i'll keep you updated, also if you find a solution let me know.

Hi Ringox!!! I'm having exact problem as your's.. This all started when I upgraded to 4.4.4 . First it was giving some weird problem like when opening camera , the phone shuts down. Then a time came the device was not charging.. The device boots up when connected to wall charger. But as soon as charger is removed the phone shut's down. Without connecting the charger when I tried to power on, it shows sony logo for 1 second the shut's down. I tried installing every stock rom , custom rom, kernel etc and it didn't solve the problem. I also bought new battery but same problem. I don't think it's software or hardware or battery problem but may be bootloader is corrupted. May be when we flash bootloader ( as in samsung) we may solve this problem. But I cannot find any tutorial an instruction to flash bootloader.
Also from quickstyler thread I can confirm that I have same problem as him, the sony mobile battey test app shows same error battery temperature -30 C . But his hardware fix didn't work either.
By searching for the problem on youtube, xda, google and other sources I can confirm 1000s of people is getting this problem ..
Please developer and member , help us provide solutions and tips what we can do next...

I have news, after one month waiting for Sony to repair my phone they've finally said it can't be fixed and they said the problem is the motherboard which is approximately 130 dollars plus installation, so I decided to park my Xperia and buy a SGS4. Something interesting that happened is that now the phone starts and sounds, just with a black screen all the time with the backlight ON, maybe they fixed something and broke something else, I don't know. If anyone knows a solution to this rather than changing the motherboard I'd appreciate the answer. I wanna fix it to give it to my mother, but I won't be buying any other Sony smartphone ever again, their service is a disgrace and I couldn't be more unsatisfied with them.