Develop Bugs

HELP! My phone gets hot and restarts! Please look for more info inside!

Hello dear friends!
HTC let me down Kind of stupid phones indeed at least desire...
I have my phone for quite a time now, it is rooted with unrewoked, clockwork recovery and s-on. I flashed many different roms in the past and everything was brilliant. In a pas half-a-year or so I stayed with only one ROM - MIUI-Au. I kept updating it to the newer versions and so on and on. Never had any random reboot or something. At least maybe it was because of some strange app or something else. But now it started to reboot randomly and constantly!
Phone gets hot abit and it just reboots, and never comes to android homescreen again, until I put out the battery, hold it for few minutes, pop it back and then it boots. But as soon as start to play music, or run a game the phone gets hot abit and reboots again. and so on and on. I thought maybe it was a miui issue. So I tried to flash different roms, but guess what? None of the even boot! The main screen shows and with the same second it bootloops again and forever!... (
Even from recovery it sometimes reboots randomly. So i managed somehow to flash my miui back and it at least boots. But it is very unstable now, I barely can use my phone now
PLEASE WHO CAN HELP ME????
My warranty probably out of date, and my phone is rooted, I dont think HTC would accept it...
any thoughts? friends?

What have you set the CPU max to?
Sent from my HTC Desire using xda premium

Thank you for response! Appreciate, really!! I didn't set it, I left everything by default I think! Because as i said, i even tried flashing different roms, not only miui.
What else could be? By the way, with stock froyo rom If I remember correctly, sometimes it became extremely hot, but I didnt get any reboots from that. But now, it gets just a little bit hot and it seems that this causes the reboot...

Now what I just noticed, I get reboots even when the phone is idle. And it is not even warm!

If its not getting hot then I'm confused lol. It sounds like a actual hardware fault. Sorry I can't help with this one
Sent from my HTC Desire using xda premium

cluendo said:
My warranty probably out of date, and my phone is rooted, I dont think HTC would accept it...
any thoughts? friends?
Click to expand...
Click to collapse
try and get it taken back to stock if you dare.
The phone hasn't been out 2 years yet, which is how long the warranty is.

Thank you! But is there any possibility to fix it without HTC involvement? Maybe it is not hardware issue ? Can it be because phone is rooted and I flashed many roms to it ? I didnt try AOSP roms since reboots started, I will try to pop in Cyanogenmod or other and see if I will get reboots.
Would rerooting my phone and updating my recovery fix the problem?
and Note: yesterday I tried to S-OFF my phone, but I can't even do that with my unstable MIUI. It rebooted in the middle of the process..

I had a similar problem, apparently it's not uncommon on the early revisions. I sent mine to HTC and they replaced the mainboard.

Thank you for answer! But what if my phone is bought through a contractor?
Can just call HTC and ask the for repair? Or should I contact my contractor first ?

Just give them a call and they will try to help you out. I had a very good customer service experience with them when my desire had some issues.
They will require a proof of purchase though. If you managed to get the receipt from your "contractor" (I am unsure what you mean by a contractor), then there should be no problem.

Sorry for misleading word, I meant T-Mobile. I bought my phone under contract. I think I have a receipt. I even have whole box and stuff of the phone somewhere in my drawer.(just sayin ). So how is customer service of HTC? Poor, good ? I heard you need to tell them that you did a factory reset and that didn't help. Is that true. Also if I will unroot my phone, will they know it was rooted anyhow?
Ahhh....this overheating issue seems common. How they can release faulty phones?? No clue.
thanks for answers mates!

In Singapore, HTC service is really good. Phone was still under warranty.
It took me just one (real) call to confirm a repair order. The first call I was just checking to see what options were available to me.
The second call was an actual repair request. And the third call was me pestering them for a pickup date. heehee
In Singapore, repairs were done via courier. They picked it up and 1 working day later, they sent it back.
Naturally, you will probably need to impress upon them that you tried everything to fix your phone (which I hope you did which includes proving to yourself that it's not the ROMs fault).
You will definitely need to reset everything back to zero. In my case, I downloaded an RUU to totally reset everything back to STOCK, which included removing clockworkmod recovery. You WILL need to create a goldcard for this though so bear in mind that it's not exactly a case of a simple flashing procedure. At least not if you don't already have a goldcard.

Sorry if I overread it at some point, but you speculated at the beginning there could be some faulty app causing this, but you never meantioned performing a full wipe. Have you full wiped yet? Just to make sure it is indeed no software problem.
greets

Thank you for your answers. At the moment I have SuperNova classic ROM. ( 2.3.3 + Sense 2.1) But my phone crashes again and again, it is so annoying and causes me so much trouble.
I never tried a reset or unroot and return to original rom. Im just wondering now, would this help to remove or at least remove those reboots?
Today I was in my work and i was keeping my phone in my jeans pocket. it got hot as u would expect when keeping in pocket and suddenly it rebooten, then it went into a bootloop and started to bootloop 7 times in a row quickly. then again and again. It became very hot at that time.
For the interest, what exact hardware faults causes these reboots and why phone gets even hotter if you keep it on boot loop. If I keep phone cold, the rom usualy stays normal, without reboots. but as soon as I start using my phone, texting or calling for at least 5minutes of using it just reboots.
as I said- really annoying thing :S
I remember my happy times with miui, apps and no reboots Was fun!
cheers for helping!

I would give full wipe / factory reset a chance, and maybe RUU.
At least try it before sending phone to htc.

It is hardware problem, search forum. Fresh ROM without SD card, enabled WIFI and GPS, running G navigation, back of the phone is warm - restart after few minutes.
Maybe someone know how to read info form the phone right before reset? We could understand why the phone is reseting and hopefully add some patch.

Reboot-loop experience
Hey,
i had the same problem over the last few months: In the beginning my phone restarted only when it got hot, but it got worse over the last few weeks, in the end i was not able to use two apps at the same time (music and mytracks) or even to surf the internet longer than a few minutes. The problem did noticeably decrease when the phone was cool - tested by putting it on a fan or in the fridge. Yet, Skype was regularly killing it. As i really love my phone (and especially the AMOLED-Screen!) i did not want to resign. The battery cover contains some metal which is supposed to enhance heat dissipation - so i attached a little thermal pad to the hotter bottom of the phone to improve contact with the head spreader. Unfortunately it did not entirely fix the problem. Yes, it improved the situation a little, but it got even worse after a week or two - in the end i had to turn it in.
So i decided to take it to the Telekom-Shop. They were very kind and told me they would call the other day to confirm that the replacement would have been shipped. It took a few days longer, but i got a phone with the AMOLED-Screen! The employee said it was a used mainboard in a new case, completely refurbished. They only replaced the main unit, i kept the battery, sd-card, charger and so on. Now i have a working Desire again!
Terminator

Similar?
Hi i on the other hand have similar problem, qiute anoying one, my desire, cm7 hboot, s-off, insert coin cm7 rom, have phone freezing in diferent situations, sometimes its working sometimes just freezez and i need to get battery out and turn it one and sometimes several times in row to get it working again???? RUU and go to give phone in service? plaese advice?

@cp6ija Sandisk SD card? If yes, smash it.

nvm
cant delete post so just posting gibberish

(Q) Touch screen doesn't respond after restart

Guys, i'm having problem with my xplay. After restarting my phone, the touch screen doesn't respond, but the gamepad act normally. To make it work, i have to shutdown the phone, n place off the battery for about an hour. Place the battery again, n the touchscreen will work again. It will work well as long as i don't restart the phone.
What do u think the problem guys?
I don't intend to bring my xplay to sony service center yet. Since it'll take my phone being serviced for a long time
Sent from my R800i using Tapatalk 2

Doesn't seem to be a problem with battery btw try replace the battery if you know anyone having xplay ! Btw did you update fw or anything before this problem started ? Or did it start all of a sudden at random ?

nikufellow said:
Doesn't seem to be a problem with battery btw try replace the battery if you know anyone having xplay ! Btw did you update fw or anything before this problem started ? Or did it start all of a sudden at random ?
Click to expand...
Click to collapse
I don't think the problem came from the battery, n i'm "very lucky" that no one use this kind of phone around me, so i can't test other battery.
This happen about 2 weeks a go. I still use the stock rom, n never did the flashing or the update thing lately.
I just think that the problem came from its digitizer, but still not sure, since it still work well once the touch work after replacing the battery about an hour n i don't restart my phone.
I intend to replace the part that break my self, but really need to know which part it is. Got confused
Sent from my R800i using Tapatalk 2

greg1806 said:
I don't think the problem came from the battery, n i'm "very lucky" that no one use this kind of phone around me, so i can't test other battery.
This happen about 2 weeks a go. I still use the stock rom, n never did the flashing or the update thing lately.
I just think that the problem came from its digitizer, but still not sure, since it still work well once the touch work after replacing the battery about an hour n i don't restart my phone.
I intend to replace the part that break my self, but really need to know which part it is. Got confused
Sent from my R800i using Tapatalk 2
Click to expand...
Click to collapse
Well digitizers can give you troubles but this looks like more of a glitch to me !

I repaired the rom via pc companion this afternoon. Had no luck, the problem still the same. N when the touchscreen didn't work, i plug the charger n strangely the phone restarted it self. After restart, touchscreen still didn't work. So i place the battery off for about an hour, n touchscreen worked again. Damn!
Sent from my R800i using Tapatalk 2

touchscreen problem
me too! i had this problem last week from stock 2.3.3 rom, i tried restoring repairing. even tried different roms. but after you restrt, touch screen wont work.only the pad.. please help us guys

cyrom said:
me too! i had this problem last week from stock 2.3.3 rom, i tried restoring repairing. even tried different roms. but after you restrt, touch screen wont work.only the pad.. please help us guys
Click to expand...
Click to collapse
Check your hardware you may have a bad digitzer.

chery2k said:
Check your hardware you may have a bad digitzer.
Click to expand...
Click to collapse
i think i have a bad flex cable.. i'll buy the flex first, if problem still persists, i'll get a digitizer..

Did you solved your problem? I have the same with Arc S

jootix said:
Did you solved your problem? I have the same with Arc S
Click to expand...
Click to collapse
I don't think anyone is going to answer this is a couple months old lol
Sent from my r800x using xda developers app
rom: cm9 official
2nd slot: turbo ui classic
kernel: Turbo v3.1

[Q] [XS] Slugishness problems and major problems

Hi everybody,
since September 2012 i own a Xperia S. At the beginning it actually worked very well but now its a complete catastrophy. The phone is extremely slow even without any apps, sometimes it just crashes and i have to force a reboot, the walkman app just freezes a few seconds and the music doesnt play in that time, the homescreen with both new and old xperia home is extremely slow and some apps just wont open even after the third click on them and only work if i restart my phone. A few little bugs are ok but when i buy a phone for 400€ i think it should at least work fluently. I meant it was Sony's flagship for Gods sake. The back cover is etremelyscratched and is not matte anymore EVEN THOUGH i used cases from the begining. The S would be such a nice device IF everything would work. I contacted Amazon(where i bought it) earlier and they said they could try to repair it. do you think that could actually help? In addition i must say my phone was rooted and even with custom Roms like xzx it was really slo. I repaired it already using the PC Companion, SUS and even by whiping everything and reflashing the STock firmware, still nothing. What do you think i can/should do? as im still a student i really dont have a lot of money but paying 400€ for that phone and then not being able tu use ist normally is just horrbile.
I would really appreciate your help:
PS: Selling would of course be an option but i would only get 250€ and thats not really a lot and enough to buy a nother Smartphone,,,

Radixtrator said:
Hi everybody,
since September 2012 i own a Xperia S. At the beginning it actually worked very well but now its a complete catastrophy. The phone is extremely slow even without any apps, sometimes it just crashes and i have to force a reboot, the walkman app just freezes a few seconds and the music doesnt play in that time, the homescreen with both new and old xperia home is extremely slow and some apps just wont open even after the third click on them and only work if i restart my phone. A few little bugs are ok but when i buy a phone for 400€ i think it should at least work fluently. I meant it was Sony's flagship for Gods sake. The back cover is etremelyscratched and is not matte anymore EVEN THOUGH i used cases from the begining. The S would be such a nice device IF everything would work. I contacted Amazon(where i bought it) earlier and they said they could try to repair it. do you think that could actually help? In addition i must say my phone was rooted and even with custom Roms like xzx it was really slo. I repaired it already using the PC Companion, SUS and even by whiping everything and reflashing the STock firmware, still nothing. What do you think i can/should do? as im still a student i really dont have a lot of money but paying 400€ for that phone and then not being able tu use ist normally is just horrbile.
I would really appreciate your help:
PS: Selling would of course be an option but i would only get 250€ and thats not really a lot and enough to buy a nother Smartphone,,,
Click to expand...
Click to collapse
That's definitely not normal. You probably have a faulty unit.

AW: [Q] [XS] Slugishness problems and major problems
You think? Do you think it would change amything if i send it in?
Sent from my LT26i using xda app-developers app

Radixtrator said:
You think? Do you think it would change amything if i send it in?
Sent from my LT26i using xda app-developers app
Click to expand...
Click to collapse
Usually, a fresh repair will solve all those slowness. But you said that after tons of repairs, the phone is still sluggish. It is definitely not normal. Best solution is to send it in for warranty or demand for a replacement unit. Best of luck.

i really hope that will work.. else im just going to sell it and buy a nexus

Post questions in Q/A from next time please. Not in General.
And yes it looks like u have faulty unit. Cause XS is not that sluggish as you are experiencing it.

ok sry didnt see that i will do so from nowon yes amazon is looking at the problem and will tell me tomorrow if i can send it in

CAUTION

I request users to please check the screens closely of their Xperia ZL. Disable the "auto-brightness", keep the brightness to maximum and set the screen time out a little higher say 5 minutes. My Software version is 4.2.2. The screen FLICKERS. I had my previous Xperia ZL exchanged because of this problem and the "new" phone has the same issue. I am currently having a miserable experience with Sony and their service centers here in India. My previous ZL had a motherboard problem and I am not totally sure if the "new" one is really new or the old wine in a new bottle. If things persist like this I'll probably head to the consumer court.
Any inputs will be greatly appreciated.

A320232 said:
I request users to please check the screens closely of their Xperia ZL. Disable the "auto-brightness", keep the brightness to maximum and set the screen time out a little higher say 5 minutes. My Software version is 4.2.2. The screen FLICKERS. I had my previous Xperia ZL exchanged because of this problem and the "new" phone has the same issue. I am currently having a miserable experience with Sony and their service centers here in India. My previous ZL had a motherboard problem and I am not totally sure if the "new" one is really new or the old wine in a new bottle. If things persist like this I'll probably head to the consumer court.
Any inputs will be greatly appreciated.
Click to expand...
Click to collapse
I did and no flicker for me.

danieldp1990 said:
I did and no flicker for me.
Click to expand...
Click to collapse
Then surely it's a case of me being conned.

No problem on mine either. Please do note that there have been some reports from Z/ZL users having screen flickering experience after upgrading to 4.2.2.

obborr said:
No problem on mine either. Please do note that there have been some reports from Z/ZL users having screen flickering experience after upgrading to 4.2.2.
Click to expand...
Click to collapse
Hmmm the problem seems to come and go. But my previous ZL had a motherboard issue as confirmed by SONY. As I'm typing this message, there's no flickering at all. I am confused. I want to get things right within the warranty period.

A320232 said:
Hmmm the problem seems to come and go. But my previous ZL had a motherboard issue as confirmed by SONY. As I'm typing this message, there's no flickering at all. I am confused. I want to get things right within the warranty period.
Click to expand...
Click to collapse
Yes, it is very frustrating. Some just restart their phone and the problem is just gone. Some experience the problem again after a few days. And not many people have this problem. So, we can't tell right now if the problem comes from the new firmware or from the hardware itself.

When I keep brightness full n that brightness slider is on screen it flickers once while rotating the screen.. When I remove that brightness slider n go to main settings menu no flickering occurs also when auto rotate off no flicker...i thing but I never use full brightness n moreover it flickers just once before rotating so I guess nothing much to worry.
India ZL 6502
Sent from my C6502 using xda premium

No issues here, C6503 4.2.2.

it happened to me one time
after I updated to 4.2.2

unmaskedfalesh said:
When I keep brightness full n that brightness slider is on screen it flickers once while rotating the screen.. When I remove that brightness slider n go to main settings menu no flickering occurs also when auto rotate off no flicker...i thing but I never use full brightness n moreover it flickers just once before rotating so I guess nothing much to worry.
India ZL 6502
Sent from my C6502 using xda premium
Click to expand...
Click to collapse
Thanks everyone..
Hmm btw another question, the replacement unit I got comes loaded with those wallpapers one usually sees in demo units. Here, the ones in the last few rows. Please check this link :
http://forum.xda-developers.com/showthread.php?t=2152482
And is it true that it's not possible to get a SIM running in demo units? I am able to make and receive calls but, for some reason I'm getting a feeling that the replacement I got is a demo unit. The IMEI number on the box and that of the phone are the same but the box does not contain the charger, earphones and the USB cable.

BTW, what I mean by flickering is CONTINUOUS faint flickering of the screen. On the entire screen. The screen shivers!

A320232 said:
Thanks everyone..
Hmm btw another question, the replacement unit I got comes loaded with those wallpapers one usually sees in demo units. Here, the ones in the last few rows. Please check this link :
http://forum.xda-developers.com/showthread.php?t=2152482
And is it true that it's not possible to get a SIM running in demo units? I am able to make and receive calls but, for some reason I'm getting a feeling that the replacement I got is a demo unit. The IMEI number on the box and that of the phone are the same but the box does not contain the charger, earphones and the USB cable.
Click to expand...
Click to collapse
charger battery earphones have separate warranty (6 months) so probably thats y not included .. besides u only exchanged the phone and not everything right

demonicjas said:
charger battery earphones have separate warranty (6 months) so probably thats y not included .. besides u only exchanged the phone and not everything right
Click to expand...
Click to collapse
Yes only the phone was replaced by them. But, the flickering comes and goes. I am having a horrible time here. Is there any chance of a refund? Worst case, I will ask them to give me an XZ as I have lost all faith in ZL anymore.

Every xperia has a demo installed in the phone..it has a demo folder somewhere inside the internal memory which contains the video demo file I foud out when I was exploring the internal memory n there is some code to activate demo on the phone all phones so no need to worry abt that n regarding only getting phone...its policy that company will exchabge obly things that u have problems with...since you had problem in phone and not in accessories so they sent you only phone nothing much I myself got replacement for faulty led indicator n they replaced only phone...
Sent from my C6502 using xda premium
---------- Post added at 09:08 PM ---------- Previous post was at 09:01 PM ----------
I tried again but it doesnot flicker at all...and do u keep brightness full all the tym...bcz its so bright even at 50% . I keep mine at 17% with auto brightness on..moreover if its bothering you y dont u demand to talk to one of the company executive n tell them issue they might offer you another device n this time after checking every thing accept the device n about Z Its kinda waste to get that cause it has much more problems n bugs than zl...search the forum u will find a plenty n I dont think you will want more problems
Sent from my C6502 using xda premium

unmaskedfalesh said:
Every xperia has a demo installed in the phone..it has a demo folder somewhere inside the internal memory which contains the video demo file I foud out when I was exploring the internal memory n there is some code to activate demo on the phone all phones so no need to worry abt that n regarding only getting phone...its policy that company will exchabge obly things that u have problems with...since you had problem in phone and not in accessories so they sent you only phone nothing much I myself got replacement for faulty led indicator n they replaced only phone...
Sent from my C6502 using xda premium
---------- Post added at 09:08 PM ---------- Previous post was at 09:01 PM ----------
I tried again but it doesnot flicker at all...and do u keep brightness full all the tym...bcz its so bright even at 50% . I keep mine at 17% with auto brightness on..moreover if its bothering you y dont u demand to talk to one of the company executive n tell them issue they might offer you another device n this time after checking every thing accept the device n about Z Its kinda waste to get that cause it has much more problems n bugs than zl...search the forum u will find a plenty n I dont think you will want more problems
Sent from my C6502 using xda premium
Click to expand...
Click to collapse
I have done all possible things from my end. My first ZL had a motherboard problem and after much argument, I got the replacement which isn't any better. They initially wanted to replace the motherboard only but I rejected it. I had asked for a completely new phone.
I usually keep the display at "auto". But now, I have kept it at "max" to check if the flickering occurs. It comes and goes. I last saw the flickering today morning. I will ask for a refund since I cannot keep a faulty product. And, I agree with you about ZL>Z in many aspects. This phone fits my requirements perfectly but what I have been going through over the past few days...a real nightmare.

No Flicker Here. Sony Xperia ZL C6506 running latest update 4.2

A320232 said:
I have done all possible things from my end. My first ZL had a motherboard problem and after much argument, I got the replacement which isn't any better. They initially wanted to replace the motherboard only but I rejected it. I had asked for a completely new phone.
I usually keep the display at "auto". But now, I have kept it at "max" to check if the flickering occurs. It comes and goes. I last saw the flickering today morning. I will ask for a refund since I cannot keep a faulty product. And, I agree with you about ZL>Z in many aspects. This phone fits my requirements perfectly but what I have been going through over the past few days...a real nightmare.
Click to expand...
Click to collapse
i understand your problem like you i am too a little touchy about my devices faults..then its better you directly demand talking to one of the executive manager. bt sad to say ,i dont think they will refund.and this time if they exchange ask a sealed box.

It's 100% related to the 4.2.2 update, so be comforted it's not in anyway hardware related. This was one of the primary reasons I downgraded back to 4.1.2.

spielnicht said:
It's 100% related to the 4.2.2 update, so be comforted it's not in anyway hardware related. This was one of the primary reasons I downgraded back to 4.1.2.
Click to expand...
Click to collapse
The problem is temporarily solved with a fresh install of the 4.2.2 update and then randomly comes again. I do not know what to do. I am forced to run to the service centers time and again. Is there any way to downgrade to 4.1.2 without losing the warranty?

Yes, you can downgrade back to stock 4.1.2 firmware, many of us have done it (flickering was one of biggest reasons). It will keep your warranty 100% intact since the bootloader isn't touched. Remember, only unlocking your bootloader voids your warranty, and you're not doing that here. You're simply using a 3rd party tool (Flashtool) in place of Sony's PCC/SUS tool to flash a 100% stock Sony ROM.
Just follow these instructions I posted last week: http://forum.xda-developers.com/showthread.php?t=2342680
A320232 said:
The problem is temporarily solved with a fresh install of the 4.2.2 update and then randomly comes again. I do not know what to do. I am forced to run to the service centers time and again. Is there any way to downgrade to 4.1.2 without losing the warranty?
Click to expand...
Click to collapse

[Q] xperia 6503 wont turn on after update

hi,
I have a big problem.. yesterday I updated zl 6503 thru pcc to the latest software 10.3.1.A.2.6.7, but when it succesfully finished I could not turn it on..
it was never rooted, I just updated it on 4.2.2 maybe 2 months ago and worked perfectly since
I tried every possible combination with buttons (up, down, power, off) but it just wont boot, just black screen and red light is on or blinking
the battery was 100% when I updated
I tried to repair it in pcc in support but nothing shows, I even updated it again thru sus, but it is always the same..
do you have any idea what it is or what can I do?
thanks

I flashed it but still the same, I think there is problem with charging, because when I plug it to power there is just red light, it wont get orange or green even if phone is plugged for hours
maybe this is why it wont boot..

skyline_slo said:
I flashed it but still the same, I think there is problem with charging, because when I plug it to power there is just red light, it wont get orange or green even if phone is plugged for hours
maybe this is why it wont boot..
Click to expand...
Click to collapse
I will contact Sony if I was you and they can replace it
Sent from my C6506 using xda app-developers app

maclancer said:
I will contact Sony if I was you and they can replace it
Sent from my C6506 using xda app-developers app
Click to expand...
Click to collapse
strange thing happened, I already gave up on it and thinking I should take it to sony, but today I just tried to charge it and it did!
when it's full, I'll see if it works normally

it works perfect, seems like the battery was totaly empty, even though it was full when I did the update..
ok now i have another question, 2 months ago I made a backup (.semc-fullbackup) I have it on my comp, I dont know how to restore that file on my phone? anybody know where to copy it?

hi, still the same issue with ZL..
every time I turn the phone off, I can't turn it on normally.. I have to leave it for few hours and then I can start charging it (bright red led), otherwise it's barely red led.. it is like every time I switch the phone off, the battery gets totally drained, even though it is never under 15%, and I think that is the reason it wont turn on
is it possible that it's battery issue or software? let me say that this happened for the first time when I updated to the latest official rom,
now I flashed it to 4.2.1 and it's the same..

HI, +1 I am experiencing the same problem now. Did my own research here, and found there is a way to deal with this. Be patient and be challenged by the problem as this is the objective I believe of this XDA community. Coming from Galaxy S2 I have experienced difficult issues and was able to solve them knowing and understanding the design, and the configuration of the phone. So am not a total newbie to flashing and custom roms. Anyway I consider myself new to XZL and would like to do the critical solving by understanding first the Sony package because I believe not all android phones are made the same Software wise.
My phone is stock, non rooted with still locked BL (JB 4.2.2), it was acquired from a seller in stock and original software condition as I prefer the UI of Sony. Lately the phone strangely began to reboot for no apparent reason, until it decided to just stop totally, doesn't switch on. It will boot up to the Sony Logo then stops dead, and the only way for me to pass thru this state is when I attach the charger.
There could be two reasons I suspect: 1) Battery is drained (although I'm sure I have enough juice) and as mentioned the charger is needed or 2) Firmware problem.
I'll share details later but based on the above I'm more inclined to focus on the second (Firmware) suspect first. My phone still has both FastBoot and Flashmode so still not bricked. Are you with me?

jun1662 said:
HI, +1 I am experiencing the same problem now. Did my own research here, and found there is a way to deal with this. Be patient and be challenged by the problem as this is the objective I believe of this XDA community. Coming from Galaxy S2 I have experienced difficult issues and was able to solve them knowing and understanding the design, and the configuration of the phone. So am not a total newbie to flashing and custom roms. Anyway I consider myself new to XZL and would like to do the critical solving by understanding first the Sony package because I believe not all android phones are made the same Software wise.
My phone is stock, non rooted with still locked BL (JB 4.2.2), it was acquired from a seller in stock and original software condition as I prefer the UI of Sony. Lately the phone strangely began to reboot for no apparent reason, until it decided to just stop totally, doesn't switch on. It will boot up to the Sony Logo then stops dead, and the only way for me to pass thru this state is when I attach the charger.
There could be two reasons I suspect: 1) Battery is drained (although I'm sure I have enough juice) and as mentioned the charger is needed or 2) Firmware problem.
I'll share details later but based on the above I'm more inclined to focus on the second (Firmware) suspect first. My phone still has both FastBoot and Flashmode so still not bricked. Are you with me?
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Click to collapse
tnx for reply, my phone is also nonrooted, I only downloaded official sony firmware
but I can't even get to the screen where is sony logo, it's dead completely, so I have to wait several hours (maybe the battery needs, I dont know) and then I can charge it.. but when I turn it off, it wont get on again..
I also thought there is firmware problem, but now I have 4.2.1 again and the problem is still here, so maybe it's not firmware?

Try flashing the .423 or .67 stock rom with the latest flashtool for xperia devices (http://www.flashtool.net/download.php).
Maybe pcc screwed something up. On my old Xperia Neo I had several problems after updating with official Sony tools.

CokeJunkee said:
Try flashing the .423 or .67 stock rom with the latest flashtool for xperia devices (http://www.flashtool.net/download.php).
Maybe pcc screwed something up. On my old Xperia Neo I had several problems after updating with official Sony tools.
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Click to collapse
I'll try, but I don't think anymore that it's software problem

skyline_slo said:
tnx for reply, my phone is also nonrooted, I only downloaded official sony firmware
but I can't even get to the screen where is sony logo, it's dead completely, so I have to wait several hours (maybe the battery needs, I dont know) and then I can charge it.. but when I turn it off, it wont get on again..
I also thought there is firmware problem, but now I have 4.2.1 again and the problem is still here, so maybe it's not firmware?
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Click to collapse
Hi Skyline_slo, just an update of what I have done; 1) I read this "http://forum.xda-developers.com/showthread.php?t=1849170" to learn and was able to
make progress on my unit. I drained completely the battery to be able to reset the kernel (took about an hour or so) because from what I have learned on start-up the kernel controls the intial process before the ROM kicks in. So if the kernel has issues, there is a chance that it will reset to default when the power runs down. I was able to successfully reached the red LED state which is the slow charging mode. This state is when the Battery icon with lightning appears on the center of the screen.
Guess what? I was able to boot my unit completely and test the new FW (while attached to the charger) and subsequently made adjustments on the recently flashed firmware (first time by the way using flashtool)
After this, I checked the service condition of the unit using the code *#*#7378423#*#*, and took note of the changes the flashed FW. Then I decided to power down my phone to accelerate the charging time and completely settle the new firmware's adjustments. My hopes are up and high again knowing that the thing is not bricked and just experienced a minor glitch probably the software.
After more than two hours I checked back and switch it on again and to my surprise it doesnt boot, just stock again in the Sony logo. Was a little disappointed but the thing here is, I made progress by ruling out that the ROM has issues, second, that draining the battery will reset the kernel and would lead to completely boot the system. At this point as previously mentioned in my earlier post, my other suspect is the battery so I will work on it today and relay/share whatever I encounter.

hi jun1662,
I'm glad that you're making progress with your unit, because I simply dont have any ideas left what to do with my unit
I flashed it to rom .244 and now I just wont turn off the phone, because I will not be able to turn it on normally again
I'll wait for next update 4.3 and then try if it's any better, but I doubt it
it may be hardware related issue, but why is working perfect when it is turned on?

skyline_slo said:
hi jun1662,
I'm glad that you're making progress with your unit, because I simply dont have any ideas left what to do with my unit
I flashed it to rom .244 and now I just wont turn off the phone, because I will not be able to turn it on normally again
I'll wait for next update 4.3 and then try if it's any better, but I doubt it
it may be hardware related issue, but why is working perfect when it is turned on?
Click to expand...
Click to collapse
Update: Definely ruled out software, and made some test related to supply meaning battery, and the result is my battery is defective, it may
provide you with a ample charge but in reality, current is not enough to sustain the requirement display and cores, so it seems the main culprit here is
the battery. Also did my own checking on the other post and inquired on how the problem manifested, and the solution is replace battery.
Going to have my unit serviced for battery replacement, and this is my final actions, if this proves pointless, i'll provide answers tomorrow. Keeping
my fingers crossed.