Can not unlock Samsung galaxy s2 after lockung screen - Galaxy S II Q&A, Help & Troubleshooting

Hello to everyone!
Few days ago my phone started behave in strange way: it manually reboots after locking screen. No matter how screen was locked: by pressing button, automatically, or even when it locks when I'm calling somebody.
System was CM 11, but now I have installed CM 12 snapshot. The problem is still present even after reinstalling system.
Maybe, someone also experienced this problem?
I would be glad to hear any suggestions.
I haven't noticed any other troubles.

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[Q] Galaxy S3 lockscreen hang and also unresponsive blackscreen

Hey guys,
I know there has been a couple of posts like this that I have found through searching but none have actually found a solution, so instead of resurrecting a old thread I thought I would start a new one.
Basically I am having some issues with my new pebble blue (yey) S3 . I have found that sometimes when the phone is sleeping when I press the power button to bring it out of sleep the lock screen begins to hang. This is followed by a number of different things, the screen either glitches for a bit and then begins to work or it stays locked and needs a battery pull. As well as this I've found that randomly either when charging or not and the phone is sleeping it simply becomes unresponsive, staying on a black screen and needing a battery pull to fix (this has only occured a few times, the hanging lock screen occurs quite often).
I have done some searching and found little in the way of a solution or what the problem is, however I have found that when the lock screen hangs -if it begins to work again after glitching out the 'WIFI connected to ****' appears at the bottom of the screen. Anyway if anyone has any ideas or also recieves this problem I would really appreciate some help as it's driving me crazy and I'm unsure if it is a common S3 bug or a faulty handset, in which case I have limited time to RMA.
Cheers in advance
Hmm, sounds like a faulty phone to me. Try taking it back to get it exchanged for onother one. S3 was built to fly not crawl.
You'll want to go through a process of elimination to figure out when might be causing it.
Something you can try and test with (one at a time)
-turn on airplane mode
-turn off live wallpaper
-shut down all running tasks
-change your lock screen security method
-limit the number of widgets running on all the screens
-reduce the number of active screens
Probably other things you can try to pull out of the equation, but thats a good start
After looking up dial-a-phones returns policy it would seem that I have 28 days to return if the handset is faulty, so this atleast gives me some breathing room to try out any suggestions for fixes. I will begin to eliminate each of the suggested items above however as the lock screen problem is intermittent it make take a day so actually see if it has had an effect, which is annoying at the least.
On another note a numberupted of people are stating high battery life on their devices however mine doesn't seem to be as good and I do have power saving on as well as nfc etc. turned off. This makes me believe my handset could have a fault, but tbf I haven't allowed for a discharge to 5% and the recharging to 100% which I heare allows for optimisation of the battery.
EDIT**** I have changed the lock screen previously and found it had no effect on the problem and I do not have a live wallpaper in use.
Phone Freezing after reboot and auto wifi signal found on.
Same here, been happening the last few days after I installed Avast. Also, turning off and on the auto on wifi seemed to replicate the problem.
The phone will boot to the lock screen and freeze a bit, and sometimes the news ticker freezes, and then after unlocked, I try to turn off wifi signal has been found on the notification dropdown and then tries to auto connect to wifi, the phone will freeze up if I dont turn it off in time.
Once the auto wifi connect is off and reboots, then the phone will keep glitching up until it catches up processing alot of processes it was trying to do for about 1/2 hr. Also, if phone freezes up for too long, like after trying too many time of unlocking the screen while freezing up, the phone gets stuck at the lock screen and the phone almost overheated, in an area right below the battery. I had to pull the battery out to cool it off.
It seems to be a glitch in the auto wifi, especially if alot of resources are being used. Once Avast was on my phone about 1.5GB RAM is being used sometimes and since has really slowed the phone down. Going uninstall alot of apps.
JCrinage said:
Hey guys,
I know there has been a couple of posts like this that I have found through searching but none have actually found a solution, so instead of resurrecting a old thread I thought I would start a new one.
Basically I am having some issues with my new pebble blue (yey) S3 . I have found that sometimes when the phone is sleeping when I press the power button to bring it out of sleep the lock screen begins to hang. This is followed by a number of different things, the screen either glitches for a bit and then begins to work or it stays locked and needs a battery pull. As well as this I've found that randomly either when charging or not and the phone is sleeping it simply becomes unresponsive, staying on a black screen and needing a battery pull to fix (this has only occured a few times, the hanging lock screen occurs quite often).
I have done some searching and found little in the way of a solution or what the problem is, however I have found that when the lock screen hangs -if it begins to work again after glitching out the 'WIFI connected to ****' appears at the bottom of the screen. Anyway if anyone has any ideas or also recieves this problem I would really appreciate some help as it's driving me crazy and I'm unsure if it is a common S3 bug or a faulty handset, in which case I have limited time to RMA.
Cheers in advance
Click to expand...
Click to collapse
Same problem.
No problem if Wifi is switched off prior to sleep.
No problem if Wifi connection is still available.
Problem to lockscreen if Wifi connection is broken (move away from connected router).
Any suggestion?
sassorock said:
Same problem.
No problem if Wifi is switched off prior to sleep.
No problem if Wifi connection is still available.
Problem to lockscreen if Wifi connection is broken (move away from connected router).
Any suggestion?
Click to expand...
Click to collapse
Exactly the same here. Driving me crazy. I did root the phone using the Samsung Galaxy S3 Toolkit. I don't know if the problem also exists on non rooted devices.
S3 black screen after unlocking
Has there anyone experience S3's screen went on black? I have pebble blue S3 - GT-I9300. Cases when unlocking, answering an incoming call or attempting to turn off an
alarm? Mine happens when after unlocking the screen then it goes black and screen becomes unresponsive. It happens intermittently and even after 3 times of
reprogramming. I am now going to have it replaced. I am having a lot of troubles -- it exits on its own when im reading or composing an SMS; files were deleted after
restarting the unit, and an app opens up even not touching the scree. This is expensive and I am paying a lot just to experience this king of inconvenience.
DavidNieuwpoort said:
Exactly the same here. Driving me crazy. I did root the phone using the Samsung Galaxy S3 Toolkit. I don't know if the problem also exists on non rooted devices.
Click to expand...
Click to collapse
I also rooted my S3 a few days ago (with the S3 toolkit), and have had lots of problems with unresponsive lockscreens (I use PIN, because of exchange connection). It takes a few seconds or maybe up to as long a minute before I'm able to punch in the PIN-numbers. Before this the screen lights up but does not respond to input.
But the WiFi-connection issue might be what is the triggering factor, because after a boot it wotks just fine for several hours, if I'm not moving out of my current WiFi zone. First I thought it was either Secure Settings or Tasker that made my device lock up in this matter, but now as they are both uninstalled, the problem still occurs.
Are you running some kind of custom rom, or just the latest stock ROM, but rooted?
Flodas said:
I also rooted my S3 a few days ago (with the S3 toolkit), and have had lots of problems with unresponsive lockscreens (I use PIN, because of exchange connection). It takes a few seconds or maybe up to as long a minute before I'm able to punch in the PIN-numbers. Before this the screen lights up but does not respond to input.
But the WiFi-connection issue might be what is the triggering factor, because after a boot it wotks just fine for several hours, if I'm not moving out of my current WiFi zone. First I thought it was either Secure Settings or Tasker that made my device lock up in this matter, but now as they are both uninstalled, the problem still occurs.
Are you running some kind of custom rom, or just the latest stock ROM, but rooted?
Click to expand...
Click to collapse
Just the latest stock ROM but rooted. I've found out that turning off the wifi power safe mode fixes the problem for me. To do this:
- In the dailer enter *#0011#
- Press the menu key
- Select wifi
- Press the on/off button.
The wifi power safe mode will however be turned on during boot. So rebooting will set it back on.
*#0011# seems does the trick. But is annoying had to do this every time after power off (change battery, change Sim, flying).... Anyway to keep the setting?
I am also on stock Rom and rooted. Interested to know any non-rooted phone got this problem?
BTW. I found a quick (at least quicker than pull the battery) way to get out of the forzen lock screen (sometimes forgot to do the 0011 trick): press the power button (screen will Dim instead of OFF), then hold the home button for few seconds, as soon as you see the "menu" and "back" button lit up, the lock is un-freeze...
A permanent solution is appreciated for such an advance phone....
sassorock said:
*#0011# seems does the trick. But is annoying had to do this every time after power off (change battery, change Sim, flying).... Anyway to keep the setting?
Click to expand...
Click to collapse
Not that I know of.
Problem solved. For me anyway. Hope works for all of you having the same trouble.
My trouble begin with recent upgrade to LH3. My S3 was rooted by S3 toolkit v2.0. CWM installed was v4 something.
I un-rooted the phone. Uninstalled S3 toolkit v2.0. Re-installed the S3 Toolkit v5.0. Rooted the phone again (CWM become v6....).
I do not know it was CWM version caused the trouble or not. But my S3 is ok now.
I got it on my non-rooted phone, any additional solutions/suggestions? or service?
I found solution for problem . And my phone is working well. I downloaded rom file android 4.1.2 and flash my phone
JB 4.1.1 caused these WiFi issues on my phone
Jodatnia said:
I found solution for problem . And my phone is working well. I downloaded rom file android 4.1.2 and flash my phone
Click to expand...
Click to collapse
Exact opposite for me...never had the problem then since loading stock JB 4.1.1 with root I get lockups or freezes whenever WiFi is turned off or I leave my router's range. As soon as I disconnect from WiFi the whole phone freezes.
The *#0010# also locks up the phone when I turn off the WiFi power saving feature.
None of this happened before JB...and I replaced my phone with week via warranty due to this and the new phone does the exact same thing as soon as I upgraded to JB with root.
Any ideas?
Black screen / random reboot solution
Hi All,
I've had the black screen / random reboot issue for a few days. The only way to restore functionality on black screen lockup was to remove the battery.
I tried changing to Chrome browser and stopping the stock browser as suggested in some threads but it kept crashing.
I searched everywhere and most threads suggest a dodgy motherboard.
For me the issue was related to either a single PDF download via the stock browser or the fact I had quite alot of saved PDF files on my phone (S3 Stock firmware I9300XXELLA)
After deleting all the files listed in Internet downloads (look for Downloads with a green arrow Icon in apps) my trusty S3 has returned to normal. No black screen lockups, no hanging, runs like a dream!
I appreciate this may not solve everyones black sceeen issues but I haven't found any other thread with this solution. Hope it works for you.
Thanks,
Giz.
giz_zard said:
Hi All,
I've had the black screen / random reboot issue for a few days. The only way to restore functionality on black screen lockup was to remove the battery.
I tried changing to Chrome browser and stopping the stock browser as suggested in some threads but it kept crashing.
I searched everywhere and most threads suggest a dodgy motherboard.
For me the issue was related to either a single PDF download via the stock browser or the fact I had quite alot of saved PDF files on my phone (S3 Stock firmware I9300XXELLA)
After deleting all the files listed in Internet downloads (look for Downloads with a green arrow Icon in apps) my trusty S3 has returned to normal. No black screen lockups, no hanging, runs like a dream!
I appreciate this may not solve everyones black sceeen issues but I haven't found any other thread with this solution. Hope it works for you.
Thanks,
Giz.
Click to expand...
Click to collapse
Thanks for the tip...
Was this happening on JB for you? You mention stock firmware (not familiar with I9300)...so I am guessing it was ICS.
For me the issues are with JB and I had no files at all in the Downloads folder after a certain point when I wiped / formatted the SDCard...so I do not think my lockups were related to PDFs. But I did (and still do) have a ton of music and a lot of movies on the External MicroSD Card....and quite a few custom notification and ringtone MP3s on the Internal SDCard. Next time I load JB I will run it a few days with none of this media loaded....
Jodatnia said:
I found solution for problem . And my phone is working well. I downloaded rom file android 4.1.2 and flash my phone
Click to expand...
Click to collapse
For me this also worked. Resolved everything. (on i9300 int)
Boomer6345 said:
Thanks for the tip...
Was this happening on JB for you? You mention stock firmware (not familiar with I9300)...so I am guessing it was ICS.
For me the issues are with JB and I had no files at all in the Downloads folder after a certain point when I wiped / formatted the SDCard...so I do not think my lockups were related to PDFs. But I did (and still do) have a ton of music and a lot of movies on the External MicroSD Card....and quite a few custom notification and ringtone MP3s on the Internal SDCard. Next time I load JB I will run it a few days with none of this media loaded....
Click to expand...
Click to collapse
This is on JB 4.1.2, Phone had been updated to 4.1.2 for about a month. The issues started after a pdf download. Once all pdf's were deleted the handset works perfectly.
Giz

[Q] HELP: Galaxy S2 not turning off screen

I have a strange problem.
My Galaxy S2 (9100) is not turning off the screen anymore.
When I press the power button, usually the phone would turn off the screen and go into sleep mode.
Now the phone immediately wakes up again, showing me the lock screen.
I got that phone on Android 2.3.3 (Gingerbread) where it ran fine in the beginning.
Then this behaviour appeared. I have updated to ICS (4.0.4) via Kies software and problem still exists.
I then thought I might try a completely new ROM, so got CyanogenMod latest stable release from their website and installed that (with google apps).
No other software installed, so I can exclude this as a problem.
Problem still persists.
So it seems not connected to any ROM neither to any software.
The strange thing is:
The power button is working, because I can
- long press to bring up the menu to shut down the phone (which works ok)
- short press and the screen will turn off - only it comes on a second later again.
Obviously this drains the battery quickly.
Help please!
TheMobilist said:
I have a strange problem.
My Galaxy S2 (9100) is not turning off the screen anymore.
When I press the power button, usually the phone would turn off the screen and go into sleep mode.
Now the phone immediately wakes up again, showing me the lock screen.
I got that phone on Android 2.3.3 (Gingerbread) where it ran fine in the beginning.
Then this behaviour appeared. I have updated to ICS (4.0.4) via Kies software and problem still exists.
I then thought I might try a completely new ROM, so got CyanogenMod latest stable release from their website and installed that (with google apps).
No other software installed, so I can exclude this as a problem.
Problem still persists.
So it seems not connected to any ROM neither to any software.
The strange thing is:
The power button is working, because I can
- long press to bring up the menu to shut down the phone (which works ok)
- short press and the screen will turn off - only it comes on a second later again.
Obviously this drains the battery quickly.
Help please!
Click to expand...
Click to collapse
Hmm this is really strange
Maybe it's a "loose connection" of homebutton?!
Try do press a bit "harder" "softer" "more up" etc... hope u know what I mean....
If one of the pressings work it seems to be a hardware prob.
If always the same it must be a software problem and u can try to flash a new kernel (if u also on Cyanogenmod)
Much success
CHEERS
Of course I have already tried to press the power button in any way I could imagine (soft, hard, more up, more down, etc) - always the same result: Screen turns off and comes back on immediately.
The question is, what kind of hardware failure can this be? The power button seems to works.
Are there any hardware features on this phone that would either automatically turn on the screen or prevent the phone from going into standby? I know some of the newer phones have a function that detects if one is watching the screen and then prevents standby. Maybe such a feature is malfunctioning? Only I am not aware that the S2 has such a thing.
I don't think it is a software issue, because I have had the same experience with 3 different ROMs now (Gingerbread, Stock ICS, CyanogenMod 9)
Same issue Here .......

[Q] Stock Android 4.3 - WiFi will not turn on problem

Hey folks, Merry Xmas and all that jazz,
I've a problem with my stock Galaxy S4 in that since a firmware update (4.2.2.2 to 4.3) I cannot for the life of me get the WiFi to turn on.
I've been reading a lot of forums, and it seems many have this issue, yet I can't seem to locate any solid answers. In fact it leaves me with many more questions.
I've been having this problem for almost a week even though the update occurred quite sometime before that. I've tried puling the battery but it didn't have any effect. Tried putting the phone into Recovery Mode, sadly I can't even get that to work (Vol. up, Home and Power together). All that happens is the tiny tiny blue text of "Recovery Mode" appears, vanishes upon button release, then the phone proceeds to boot normally. No recovery mode at all. Eventually I decided to to a Factory Reset in the vain hope it would reslove the problem. Answer: No. All I've succeeded in doing is losing all my data (yes it was backed up but to restore the backup I need to have WiFi turned on!)
Anyone out there know of a solution to this problem?
Just to mention, this is a stock Galaxy S4, non-rooted, on the Vodafone network in the UK.
Help?
Frustrations abound, any help will be greatly appreciated.
Cheers,
Nicowab.
N.B After downloading Kies3 I've been able to update with latest firmware.....and I can now turn on my WiFi!! WOOP!! About bloody time too!
N.B.2 Scrub that last comment. After being able to turn Wifi on and scan for signal, it allowed me to enter the password for my home WiFi then I restarted the device only to find that again the Wifi option on the phone will not turn on. Very very frustrating. Anyone got any ideas?
i have same problem on note 3 n9005

Random Freezing and weird Vietnamese settings page

Hi,
I replaced my cracked screen around 6 months ago. The new screen is an FTS-TS type. Everything was smooth and fine until about 6 weeks ago when the phone started randomly freezing. During a freeze, If I press the power button off and on again (not rebooting) it's OK until the next freeze. It does this very many times a day, some days are worse than others. One consistent thing - it will ALWAYS freeze on the lock screen following a reboot, even following a factory reset or using safe-mode.
Recently I noticed that a page of Vietnamese language settings appears when coming from an idle lock screen state to the home screen. It now does this a few times a day. Since my phone is set to English, this is very odd. Even if it was in English, it's very odd a random page of settings opening itself in such a way. I have hardly any of my own apps installed since I've done several resets so there is no app that I could blame for this odd behaviour.
In desperation I wanted to try a custom rom. However, I could not even install another ROM via TWRP since when I got to the TWRP lock screen (after unlocking the bootloader and installing the TWRP image) I could not swipe to unlock it, and power on and off was having no effect! This means I am stuck with the stock rom (MIUI Global 11.0.8 stable) and can't try anything else.
I did try another bootloader and that also froze
At this stage I am assuming the fault is a software issue rather than an hardware issue.
Xiaomi UK have washed their hands of this issue, I don't expect any help from them anyway as it's out of warranty now. They keep repeating themselves by suggesting factory resets, even though I'm blue in the face telling them that that is not resolving the issue.
Any help with this frustrating issue would be very welcome !

Unlocking problem

Hi!
Since Android 11 update came out everything was fine. Today I've noticed strange problem with unlocking phone... When i lock phone and leave it for a while fingerprint not responding. I need to press unlock button (sometimes twice) to use it.
Build-in test are fine, glass above screen is clean and i did restart.
I've had the same problem, but it actually started happening to me with Android 10 within the week before AT&T released their Android 11 update. I have found no solution to the problem yet, and basically got used to a slow double-press of the power button to pop out of sleep (or AOD) and into my lock screen for unlocking.
I was actually wondering if it had something to do with my preferred dynamic live wallpaper.
(https://play.google.com/store/apps/details?id=games.paveldogreat.fluidsim)
Or perhaps Nova Launcher. I think both got updates around the same time this started happening to me, just before Android 11 landed.
I haven't really tried troubleshooting by removing on or both of these apps, however.

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