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Phone keeps randomly rebooting into a loop

I have my Galaxy Exhibit (II) 4G for about a year and two weeks now. Warranty period is just over. I used Stock ROM in the beginning and have been using CM10(.1) roms for about 10 months.
Yesterday early night I noticed my battery suddenly diminished about 60% in 15 mins. Then I had it in the charger later, and I think I let it fall one time, like that happens sometimes. Since then my phone has been randomly rebooting and then looping either the battery sign or the Samsung sign.
Usually I can get it to boot up again with holding the power button, but sometimes I just keep pressing everything until something happens.
I can get into recovery. I tried wiping everything. I have tried deleting battery stats. I have tried other (non-oc) ROMs.
NOTE that sometimes it happens in recovery mode too, usually right as it is getting into it, so it might be totally non software related.
Do you guys think my phone is broken? Or is it worth trying to buy a new battery?

Turns out the phone thinks its on/off button sometimes is pressed, so it keeps rebooting. If I press it a couple times it's over. But then then next time there's always like a 50% chance that it gets stuck again...

Did you solve your problem because am facing the same problem. I can't even make it far enough to boot into recovery
Sent from my Nexus 7 using xda app-developers app

I'm stuck in the same problem, first I thought it was a physical problem but I had to get technical assistance of an expert and he confirms its rom problem. he's going to install stock again via some freaking hardware because with my pc I couldn't. Any suggestions?
Enviado desde mi GT-I9100 mediante Tapatalk

Defintly this guy couldn´t fix it, he reinstall the previous t-mobile original firmware and nothing happens, still rebooting. Another technician check it and told me he must replace a bootloader IC, I hope it works.

Now the "new technician" couldn´t fix the phone. He told my wife that previous Rom (cyanogenmod unofficial)"must have a virus and it infected the boot". I keep thinking is a hardware malfunction. Any suggestions?

If you got the ROM from xda I doubt it had a virus. Have you tried Odin back to stock yet. If not try that first.
Sent from my SGH-T679 using xda app-developers app

I dubted too, the problem is it can´t boot. I have the samsung logo, then it apears the Exhibit logo and shuts down, it keeps like that again and again. I managed to get download mode but the same, 3 sec after it shuts down so i can´t install anything.

Then ya i would have to agree that the device is defective.
Sent from my SGH-T679 using xda app-developers app

I had the same problem and i use to solve it by hitting the phone from the back and after i let it fall accidently it back to normal

I have the SAME problem!!!
ok so, my phone was awesome but since this is vacation time I decided to try a new rom, It was fine but then it started rebooting all the time. HOWEVER, I was able to try other roms after several attempts and think it's related to the calibration of the power button. It tries to stay awake but when I try and press the power button, that's when the problems start. Does anybody know of a way to calibrate the power button? I think that would be the solution, in case that's even possible. If not I'll have to buy a dumbphone for I don't have the money to spare on a new phone just now...

I had something similar happen this weekend. This may not apply to everyone, but I found that after pressing the power button over the course of two years the thin plastic "arms" that hold the power button inside the case have become stretched and weakened. Went back to stock to eliminate every conceivable variable. It would continue to reboot even without touching it, with or without a case. Essentially, the power button is resting against the motherboard's power module, or rather stuck and wreaking random havoc.
I fixed it and haven't had a reboot this week by using tweezers and squeezing the posts that hold the power button arms in place tightly against the outer shell. The objective is to create as much resistance as possible and have the power button spring away from the mobo. The power button has rubber pads that, when pressed, pushes against the mobo power module, so to create more distance I filed down the pads a few mm's. If it happens again I will resolder the points and remap the keys, until then I went ahead and cleaned the solder points with a q-tip and rubbing alcohol.
Removing the outer shell takes some time to break the glue apart without damaging anything, so take that into consideration and move at insect speed if anyone considers this approach for the first time. The best reference I can spot is at http://www.youtube.com/watch?v=I3dAOv2Oke0&t=6m11s where the power button is on the right hand side of his right hand. I'll try taking photos or video if it happens again.

I'll try this
jfbs said:
I had something similar happen this weekend. This may not apply to everyone, but I found that after pressing the power button over the course of two years the thin plastic "arms" that hold the power button inside the case have become stretched and weakened. Went back to stock to eliminate every conceivable variable. It would continue to reboot even without touching it, with or without a case. Essentially, the power button is resting against the motherboard's power module, or rather stuck and wreaking random havoc.
I fixed it and haven't had a reboot this week by using tweezers and squeezing the posts that hold the power button arms in place tightly against the outer shell. The objective is to create as much resistance as possible and have the power button spring away from the mobo. The power button has rubber pads that, when pressed, pushes against the mobo power module, so to create more distance I filed down the pads a few mm's. If it happens again I will resolder the points and remap the keys, until then I went ahead and cleaned the solder points with a q-tip and rubbing alcohol.
Removing the outer shell takes some time to break the glue apart without damaging anything, so take that into consideration and move at insect speed if anyone considers this approach for the first time. The best reference I can spot is at http://www.youtube.com/watch?v=I3dAOv2Oke0&t=6m11s where the power button is on the right hand side of his right hand. I'll try taking photos or video if it happens again.
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Again, all your symptoms are identical to mine so I'll try this and update on it ASAP. Thanks for the help!!!

Endless safe-mode loop after water damage

Hi all!
My phone got water damaged (a little bit, the back cover wasn't properly put) and the phone now turns on only in safe-mode, even if I reboot, pull the battery or do a factory reset. My volume-down key doesn't work now, if that could be the problem.
Does anyone know what I could do?
Thank you

Mine was doing the exact same thing, except my volume-down key acted as if it was being pressed down constantly. I spilled water on it while on a cruise and it wasn't the same. My phone would constantly mute and the volume overlay was constantly visible on the screen. I had the safe-mode on reboot several times, I'm assuming holding the volume-down during boot is what activates it.
My fix was pretty brutal, I popped the volume button off with a thumb tack, then uses tweezers to rip the volume ribbon cable out of the phone. I now have to go into the settings menu to adjust volume, but at least the phone is usable. My hunch is that water damaged the ribbon cable via the volume button.
The actual fix would be to replace the frame/back housing bezel for the phone. It's only about $8 on Amazon (http://amzn.com/B00K458DUK), however it requires removing the screen. My phone has been dropped a few times so I'm worried the screen won't survive a transplant. A replacement screen is $150, so I've just been dealing with no volume control for now.

I see... thanks for your input! I'm guessing mine is having the same problem. I'm not comfortable doing the brutal fix myself, but I don't know where I could take it around here to get it fixed.

Power Key Stopped working

Alright guys so here's the pie I have been trying to fix my power key on the right hand side of the device opposite the volume key for those of you who don't have a Note 3. Over the past couple months I've noticed that the power key has been getting flatter and flatter against the bezel of the Note 3 so I decided that I would swap it. I realize later that I couldn't get the part in myself so I took it to a company and got them to put it in but what we found out is that the power button is now not turning on the phone we replace the ribbon and still nothing is this software issue or is it a hardware issue. I will also have you know that the phone is now back on I use a trick to get it back on with the download sequence and then just cancelled it and reset my reset the download so that it would just reboot normally so I know that the software itself is probably ok but I'm wondering if it's specifically related to the power key anything you guys have would be awesome because I'd like the phone and it works great and I've had it since it came out but I don't want to just throw it away just because the power button is having an issue that I probably could fix if I knew what the real issue was thanks for any input you all have

power button problem

hello friends, today dropped my droid turbo, after that it seems that power button is little bit fell in, so it's harder to press on it, it's no more like volume button (no click effect), but it steel works, so is there some solution to fix it without disassembling whole device? thanks

Niku7a said:
hello friends, today dropped my droid turbo, after that it seems that power button is little bit fell in, so it's harder to press on it, it's no more like volume button (no click effect), but it steel works, so is there some solution to fix it without disassembling whole device? thanks
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I have a not-quite-so similar issue; I dropped mine a couple of weeks ago, with a Diztronic case on it, and it landed on a brick walkway directly on the power button completely disabling any function whatsoever to the power button. I thought about opening the back of the phone and trying to replace the button with one from a previous busted quark that I still have. But instead, I have gotten by without it by using Lock Screen Widget (free from Google Play, along with other similar apps), which can place a button on the screen, either permanently or on Home screen only, to turn the screen off.
Now, to turn the screen on, Ambient Display has proven to be invaluable, plus in the Button settings of the Bliss (@NepoRood) custom rom I'm using, there is a selection to wake the phone using the volume button and I have it set to wake when it's plugged into a charger / PC. If you're not using Bliss, I'm pretty sure other custom roms have these wake features; if you have unlocked bootloader and root access, the Xposed module Gravity Box may be able to enable this as well. However, if your phone isn't rooted, I'm not sure if this wake feature would be available.
I know this may not directly answer your question, it's just what I've been using to get by. I am curious though if anyone else has had success personally replacing or repairing the power button.

RL_Wells said:
I dropped mine a couple of weeks ago, with a Diztronic case on it, and it landed on a brick walkway directly on the power button completely disabling any function whatsoever to the power button.
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thanks for reply
so does anyone know i need to buy new button and replace it or need to change whole frame, which holds that power button?

Niku7a said:
thanks for reply
so does anyone know i need to buy new button and replace it or need to change whole frame, which holds that power button?
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A few months after I got my original Droid Turbo the power button failed. Wouldn't turn it on or off. Physically had a problem. They told me that there is an issue with their power buttons and when it gets like that they have to replace the button.
However, perhaps you do have something as simple as a dented case/cover in the metal by the button which is restricting the button from functioning as normal. If you have something small and thin like an intricate pick tool, you might be able to get down in there a little bit and see if you can go all the way around the button. If it sticks or stops, that might be a dented area.

Galaxy Note 8 won't turn on or charge!

I have a Galaxy Note 8 model SM-N950F/DS which I bought on the beginning of 2018 from Qatar with UAE FW, yesterday I was talking to my wife through a video call on Facebook Messenger for almost 1 hour, noting that I was calling her everyday since last January as I'm residing in another country for the whole day and never experienced the following problem except the heat one around 1 or 2 times only just lasts for a few seconds to a couple of minutes!
The phone was standing on wooden stand from IKEA Belgium inside a back cover from AUTO FOCUS and the phone is coated by mobile outfitters (these information may help in the over heating issue) and while we were talking the screen freeze and there were a couple of colored lines in a small area in the top quarter of the screen.
I took the phone and found it over heated from the back side at the bottom quarter and not responding with freeze screen, I searched the internet and found that I can restart the device by holding the power button with volume down button, it worked and the device restarted and gave me a black screen with blue blinking LED then I did use again the power button with the volume down button and it worked but turned off after requesting the OS login pin code.
After that I switched it ON and did the same for around more 2 times then stopped working!
I found on the web that I have to connect it to a wall charger via the original charging cable for around 10 minutes and then try the power button with the volume down, it worked and gave me the charging screen with the phone OFF and it was reading something in 20s percentage so I left it until it reached around 44% then tried to power ON the device again and the same thing happened, it gave me the "Galaxy Note 8" logo then asked for the OS boot pin and after I entered the pin it gave me "starting phone..." then stopped!
I tried to leave it again for 10 minutes in the charger and do the power button with the volume down and it gave me the charging screen again!
I left it until it reached 70 or 77% (don't remember exactly) and then tried to switch it on to the boot menu using the power button + Bixby button + volume up button and wiped the cache partition, after wiping that partition the phone restarted and never came up again!
None of the above worked again! Not leaving it charging for 10 minutes then try the power key + volume down key! Not the power + Bixby + volume up! I even found someone connected the charger for seconds then removed it then pressed power + Bixby + volume down and his phone worked, it didn't work to me!
Overall this, the phone isn't warming up when it connected to the charger back! so either it has a full battery or it stopped charging for hardware failure!
I don't know what to do, I almost tried everything and I can't imagine how it can have a hardware malfunction because of the over heating and worked several times after that! As I'm an electronics engineer I faced this before in certain embedded systems boards but it has to stop directly if there's a short circuit or certain damage in the circuitry.
I hope if someone can help regarding this!

I would bring it in for repairs. Sounds like a fried board.
Happened to my wife's redmi note. Phone was left on car dashboard under the sun with waze running and battery charging. Outside temperature was around 37 degrees celsius. When she reached the destination 1 hour later the phone was too hot to hold.
The phone screen froze. Managed to reboot it but phone never booted up again.
Got it fixed under warranty though.. Was a new phone back then. Change of board fixed it.
Sent from my SM-G985F using Tapatalk

vash_h said:
I would bring it in for repairs. Sounds like a fried board.
Happened to my wife's redmi note. Phone was left on car dashboard under the sun with waze running and battery charging. Outside temperature was around 37 degrees celsius. When she reached the destination 1 hour later the phone was too hot to hold.
The phone screen froze. Managed to reboot it but phone never booted up again.
Got it fixed under warranty though.. Was a new phone back then. Change of board fixed it.
Sent from my SM-G985F using Tapatalk
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Thanks for your response, it seems like this is the only way but since that I have to take an appointment because of the current situation of the pandemic and since there still time for this appointment I though to post the problem here may someone discover a solution to try if the problem still software not hardware!

Now I understood what it really may happened if the problem is hardware and it's obvious now that it's definitely hardware!
If it's a fried board so it seems like the tracks on board was about to damage and this explains why it worked several times, during these several times, the passing current in this fried board starts to lose the connection damaging the board more and more until it became a total loss, which switched the phone OFF totally, so if this explanation is correct I don't think that I have anything to do except waiting until the service center open the phone chassis and look inside!

Ahmed.Talaat said:
Now I understood what it really may happened if the problem is hardware and it's obvious now that it's definitely hardware!
If it's a fried board so it seems like the tracks on board was about to damage and this explains why it worked several times, during these several times, the passing current in this fried board starts to lose the connection damaging the board more and more until it became a total loss, which switched the phone OFF totally, so if this explanation is correct I don't think that I have anything to do except waiting until the service center open the phone chassis and look inside!
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Could be the integrated circuit board as well. Thousands of mini gold threads in it.
Sent from my SM-G985F using Tapatalk

vash_h said:
Could be the integrated circuit board as well. Thousands of mini gold threads in it.
Sent from my SM-G985F using Tapatalk
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That's what I was wondering from the beginning, if there's a damaged IC from the over heating, how could you explain that it worked several times after the heating issue? Do you mean there was a partial damage in the beginning doesn't prevent the phone from working back again?

Ahmed.Talaat said:
That's what I was wondering from the beginning, if there's a damaged IC from the over heating, how could you explain that it worked several times after the heating issue? Do you mean there was a partial damage in the beginning doesn't prevent the phone from working back again?
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Sometimes when something is about to fail but isn't completely dead.. Sometimes it works intermittently.
Sent from my SM-G985F using Tapatalk

I have a new update, after I left the phone for around 4 hours since our earlier conversation, I tried the combination of power button + volume down + Bixby key, the phone worked and gave me a green screen, when I pressed volume down to cancel and restart it, it didn't restart but gave my a black screen, I connected the charger and it gave me the charging screen with 0% battery!
Could be a battery issue?! The device was OFF, how did it drain the battery without operation?!

vash_h said:
Sometimes when something is about to fail but isn't completely dead.. Sometimes it works intermittently.
Sent from my SM-G985F using Tapatalk
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It seems like it still working! Now how can I tell there's no hardware issue beside the battery if it's the problem? Should I wait till the service center too or can I confirm with anything else? I'll leave it until reaches 100% and try to switch it ON while the charger plugged in, so it can boot up again easily!

Could it be the power management IC has something wrong? So it can't operate the phone very well?

After the phone reached up to 93%, I tried to switch it ON in Safe mode, but it didn't continue. I tried to open the recovery menu, it stuck in installing updates 3 times, each time it restarts, after that it could enter but without giving me the menu options, instead in the Android console screen it gave me some errors, the first one was that it can't load the recovery menu with no such file or directory between brackets!

To keep all of you updated with the phone's situation, I went today morning to Samsung Service Center and after they tried to operate it, they said the device is acting weird because it login to the OS then shuts off directly and this could be due to either the main board, the battery, or the operating system, but they refused to receive the phone after they knew that it came from outside Europe, so I took it to a 3rd party Service Center and I'm waiting for them to call me after their analysis!

Today the service center called me to pick up the phone and he said it might be the main board nothing else because the system doesn't load to the to the end, so I told him it might be a partial damage in the ROM so there are some corrupted sectors which prevent the system from logging because the loss of some files, he said yes maybe, then I asked him if he opened the phone he said yes, I asked if he noticed any damages in the main board like burns or anything, he said no!