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[Q] Problem: Screen doesn't show anything after some time

I have a problem with my Xt720.
I have the Froyo Rom by khalpowers V3. (this one http://forum.xda-developers.com/showthread.php?t=1002993)
Everything works just fine and how it should. But after about 20 minutes when my screen turns off or when I turn my screen off, I can't turn it on again.
I press the Powerbutton and all that happens is that the led row lights up but the screen stays black.
I'm not sure but I think the touch screen doesn't work either because I can't unlock it by sliding the unlock thing. (or I just can't find it when the screen is off)
This began today and I did nothing extraordinary with my phone. When it started I had the Dexter's Froyo (http://forum.xda-developers.com/showthread.php?t=939644) Version 1.2. But it has never been a problem before.
Then I flashed the above called Rom by khalpowers and it's still the same problem.
Everytime it happens I have to remove the battery and reboot the phone to use it again. This is very annoying and not how it should behave.
Wat do?

Monthana said:
I have a problem with my Xt720.
I have the Froyo Rom by khalpowers V3. (this one http://forum.xda-developers.com/showthread.php?t=1002993)
Everything works just fine and how it should. But after about 20 minutes when my screen turns off or when I turn my screen off, I can't turn it on again.
I press the Powerbutton and all that happens is that the led row lights up but the screen stays black.
I'm not sure but I think the touch screen doesn't work either because I can't unlock it by sliding the unlock thing. (or I just can't find it when the screen is off)
This began today and I did nothing extraordinary with my phone. When it started I had the Dexter's Froyo (http://forum.xda-developers.com/showthread.php?t=939644) Version 1.2. But it has never been a problem before.
Then I flashed the above called Rom by khalpowers and it's still the same problem.
Everytime it happens I have to remove the battery and reboot the phone to use it again. This is very annoying and not how it should behave.
Wat do?
Click to expand...
Click to collapse
Let it charge for a while and try again. Your battery may be extremely low. Turning on the button lights is one thing it does when there isn't enough power to boot even to the "display a charging battery" mode. This has happened to me.

I've had this issue ever since I got my phone. This would just happen completely randomly (nothing to do with battery or anything else). It happened pretty unfrequently and barely ever happens ever since I put on Dexter's 1.3. Not sure what causes it - but it looked to be completely random for me.

Monthana said:
I have a problem with my Xt720.
I have the Froyo Rom by khalpowers V3. (this one http://forum.xda-developers.com/showthread.php?t=1002993)
Everything works just fine and how it should. But after about 20 minutes when my screen turns off or when I turn my screen off, I can't turn it on again.
I press the Powerbutton and all that happens is that the led row lights up but the screen stays black.
I'm not sure but I think the touch screen doesn't work either because I can't unlock it by sliding the unlock thing. (or I just can't find it when the screen is off)
This began today and I did nothing extraordinary with my phone. When it started I had the Dexter's Froyo (http://forum.xda-developers.com/showthread.php?t=939644) Version 1.2. But it has never been a problem before.
Then I flashed the above called Rom by khalpowers and it's still the same problem.
Everytime it happens I have to remove the battery and reboot the phone to use it again. This is very annoying and not how it should behave.
Wat do?
Click to expand...
Click to collapse
Another suggestion. Since you've already swapped ROMs, maybe it's related to the SD card. Perhaps try backing your SD card up, reformatting it and copying the data back (do this on the PC not through USB access). Then reinstall your rom in OpenRecovery and factory wipe.
(You don't happen to be running WidgetLocker?)

@Mioze: The battery was at 70% a few hours after I loaded it to 100%, so that's probably not the problem. I don't have widgetlocker and it also happened with the sd card taken out.
But it didn't happen since I've started this thread so maybe I'm lucky and syrenz was right.

i have had this problem on every rom. it is related to sdcard. happens to me almost everytime i try to unrar one of khals rar files it always happens when im doing something sdcard related. last time it happened i did a battery pull and when it powered up my sdcard would stop checking for errors and everytime the screen turned off it wouldnt come back up. i had to plug into pc and check for errors and then it worked again without having to reformat it. my advice is get a faster sdcard. the stock one just doesnt cut it.

Trying a 4Gb Kingston Sd card now I used with my Dslr before.
I used the stock sd the whole day after I checked it for errors yesterday and it went well until I tried to download something from the store.
By now there seems to be no problem. Going to update my post if the problem still exists.
If it's ok: Thank you all for your efforts to help me.

Now this is ironic, as my phone began doing this today after put a new 32GB class 10 (Patriot) microsdhc card and reflashed Dexter's 1.3 and added bugfix v3 to it. After some tinkering, I think I nailed it down to me undervolting the processor.
I'm assuming the new microsdhc card need's a little more power than I was allowing. I was clocking the processor to 720Mhz/Vsel43, I left the speed at 720Mhz, but increased the vsel to 45, which seems to have solved the above described problem. However when I tried to copy my music over to the phone, it borked out again. So I've increased the vsel to 50 and things seem to have settled down. (fingers crossed)
G.
Ack! I spoke too soon. I just tried to install Steve Lin's Gingerbread keyboard and the phone reboots at the end of the download, even though I tried increasing the vsel. Going try clearing the Dalvik/Cache and see if that helps any.

I've flashed my XT720 to the khalpowers MIUI-Optimized V3 with the camera update.
I originally had a Sandisk 8GB Class 4 SD card, but after installing a new Adata 8GB Class 6 SD card, I started having the same issues. I was running Milestone Overclock on non-custom overclock settings, so it was running at 1GHz @ 74 vsel.
Honestly, I don't know that I've seen a discernible difference between the Class 4 and Class 6 card, so I may go back to the original card until I get more concrete data on how to fix this.

Let me share my 2 cents regarding sd cards.
first trouble shouting:
1. use the phone without the sdcard to see if the problem disapear
2. while doing 1. test the sdcard. Have in mind that sdcards are little bit different from normal hdd. For example i had 2 sdcards which locks the phone, but seems good on normal fs checking (even bad sector check option forced). but this 2 cards failed on the following test
test read speed of the sdcard for every 100 MB of it. for my desktop the script looks like:
Code:
i=0; while [ $i -lt 75 ]; do echo $i; dd if=/dev/mmcblk0 of=/dev/null bs=1M count=100 skip=`expr $i \* 100`; i=`expr $i + 1`; done
dd utility will probably report the speed (else just type time dd ....., then you will have the time)
if the card is good, then the speed has to be almost constant
for example on the good card i am using now is almost constant from 13.1 till 13.6 MB/s
for one of the bad, i observerd droping from 10 MB/s to 3 MB/s for a specific space range. then had run several tests just in this range and it turnout that this area of the sdcard is slow. That means that the card is on it way to the RIP.
For us it means that some sdcard io will timeout and soft lookup can happen (e.g. so called warm reboot, or just system_server kill by the watchdog). The other possibilities is more worse, just freeze and the watchdog cannot kill the system_server (probably because hang io operation)
Personally i was runing adb shell when the phone had freeze. it turns out that the linux works somewhat, but even as root i was unable to kill any process (probably because io hung operation), also every operation with the sdcard has hangt the current adb session, so i have to open new one....
secondly performance
0. If you wish you can perform the read speed test from above, but with write and to observe weak areas of the new sdcard
1. align the partitions on 8192s boundary (both of them to start on 8192*X sector)
2. format the fat32 so 64k logical cluster is formed (i use mkfs.vfat -S 4096 -s 16 options )
3. do the read_ahead tweak
4. be sure to using noatime mount options
5. vold checks the fat partition for you, make sure that thex ext[234] partition is checked before is mounted
6. If you decide to move the /data/dalvik-cache, move it to the /cache partition, not the ext[234] one
and do not forget, that free internal phone storage has no benefits. so as the internal nand is faster, use it as much as you can
p.s. and just to share: i have troubles with the thumbnail service. it turns out that when it runs (e.g. when i lock the display) it find some broken images and crashed badly, invoking warm reboot. after deleting this broken images, this problem was solved

I've been using the Kingston 4gb sd for a few days now and the problem's gone.
So that might be the solution.

I use 8GB C2 sdcard, and turn off desktop cache in system setting of ADW, this problem was gone.
It seem to be caused by ADW places cache in SD.

I've left my Adata 8GB Class 6 SD card in for now, but after removing the SD Speed Boost app, it appears my problem has gone away. I've never had the persistent memory setting enabled on ADW, btw.
Edit: I was curious if the SD Speed Boost would work after a reinstall, but 20 minutes after, I was pulling my battery, so I'm pretty sure it was that app at fault.

easye420 said:
i have had this problem on every rom. it is related to sdcard. happens to me almost everytime i try to unrar one of khals rar files it always happens when im doing something sdcard related. last time it happened i did a battery pull and when it powered up my sdcard would stop checking for errors and everytime the screen turned off it wouldnt come back up. i had to plug into pc and check for errors and then it worked again without having to reformat it. my advice is get a faster sdcard. the stock one just doesnt cut it.
Click to expand...
Click to collapse
I got the issue even I'm using the class 10 SD card it seems not related the SD speed.

Annoying.......
This problem just started happening to me but I doubt that it is a SD card problem. Mostly since my phone has been unresponsive since yesterday afternoon and I can't even get the LEDs to light up or get the screen on at all. I got it to work after relentless battery pulls and taking the SD card and SIM out. But I decided to turn it off so I could pop the SD and SIM card back, it went back to its non-responsive mode. I also am unable to get to recovery mode or even the bootloader. My tech always seems to break all on the same day (my bike too >_<).

just try without sdcard
Sent from my Milestone XT720 using Tapatalk

I'm almost positive this is sdcard related it only happens to me when I'm doin something sdcard related. Happens like clock work when I try to unrar one of khal themes that's 100 or more megs same when I use the unyaff app to extract my data.img from my back up. Ive had this problem ever since upgrading to 2.2 never happened on 2.1 I've just gotten used to it. I dont think its gonna go away I'm thinking the sdcard must timeout or something.

easye420 said:
I'm almost positive this is sdcard related it only happens to me when I'm doin something sdcard related. Happens like clock work when I try to unrar one of khal themes that's 100 or more megs same when I use the unyaff app to extract my data.img from my back up. Ive had this problem ever since upgrading to 2.2 never happened on 2.1 I've just gotten used to it. I dont think its gonna go away I'm thinking the sdcard must timeout or something.
Click to expand...
Click to collapse
Well just did a battery pull again and just took out the SD card and put the battery back in and tried to turn it on again but to no avail. Really annoying not having having my phone.....

This is also happening to me too... regardless if i have anything installed or accessing any files on my SDcard... and i already flashed my xt720 back to stock... and still the same... already changed my SDcard from the 8gb that was included on the package to 16gb... but still the same... i am very dissapointed with this device... just got this last week...

Still Annoyed....
My problem is still persisting after 2 days now and I'm torn between junking this phone and getting something else or trying to find a way to get my phone back in working order. I've tried just about everything I can do physically with the phone (battery pulls, w/o SD or SIM or with both in or one or the other out, etc........). So far all I have right now is a $400 dollar paper weight.
On another note, for some reason it keeps phoning my dad or sending him text messages with random assortments of code or error messages..........

Galaxy Tab continually pauses during gameplay

Guys,
I have a very weird problem that started a couple of days back with my Galaxy Tab.
I was running a game (game name does not matter as the problem happens in all games) when all of a sudden the 'Pause' screen came into effect.
After hitting any key to continue it played for around a further 20 seconds then it happened again... and again... and so on.
Some games simply pause whilst others will flip back to the reload the game screen then flip to the press continue to play screen.
Whatever it is it only effects games.
I have tried several reboots and looked at all my recently installed/updated Applications but can not ascertain what is causing the issue.
Further, whilst browsing through my installed Apps using the App 'System Panel' (to see if I could locate the offending App) I also noticed when I scrolled down through my installed Apps every few seconds the list would jump back to the beginning of the list.
No matter how many times I scrolled down after a few seconds it repeatedly jumped back to the beginning.
After about a minute or so it stopped doing this.
It's almost as if something is paging the system every so many seconds ~ which may also explain why when playing games it drops the game into Pause mode.
Anyway, the Galaxy Tab is a stock Tab unaltered. It is not rooted nor had a ROM change.
At this stage I do not wish to update the ROM nor perform a factory reset.
As a surgeon you investigate the cause of the problem and not simply give the patient a tablet to mask the pain and send them on their way..... I wish to do the same with the Tab, find out what is causing the problem and not just do a system reset.
Any ideas ladies & gentlemen?

Same problem
I have the same problem on my stock ROM tab.
It's nerve wrecking to reinstall everything again.

Killerpint said:
I have the same problem on my stock ROM tab.
It's nerve wrecking to reinstall everything again.
Click to expand...
Click to collapse
As the OP that reported this I feel for you.
I have no idea what caused the problem nor do Samsung.
All I can say is I switched the phone off one night because it was playing up that bad and used my Galaxy S that evening.
The following morning I switched the phone back on again and mysteriously the problem simply vanished.
All I can think is whatever was causing the problem must have been memory resident.
Killing the phone for a long period must have cleared the issue.
I have not come back and reported it is fixed yet as I want to do further tests just to make sure it has gone but more importantly try to find out what caused it in the first place.
In a way although I do feel for you I also am pleased someone else has the problem.
This proves it is not a totally isolated case and may crop up again.
The tests I am currently trying are with the external SD card.
Do you have an external SD card and did/does the problem happen only with games installed to the card?
I have found that all but one of the games were installed in this way.
The one game not installed to SD that when run pauses behaves in a slightly different manner in that it does not pause every 20 seconds or so but every 1 minute or so.
I am beginning to think the problem may be something to do with timing, memory and the external SD card.

[A700] crash instead of powering off when empty

Hi devvers,
The last update for the German version of the tablet is not working so well for me.
First things first: the tablet drains a lot of battery power! Have you noticed that too??
And second: when the tablet is almost empty like 7%, the tablet turns off instantly. I don't see the second warning screen because there's still over 4% left. It used to show me the second screen and then when it's really empty, Android powers off.
Turning the tablet back on isn't an option anymore. You have to plug the charger and then it'll boot again.
I'm using a stock rom and no root whatsoever.
Am I the only one out there? :/
Ps. Are there people having a notification showing that the sd card is inserted every hour or so?

Okay, this problem has occured multiple times and today nothing happend and everything went how it should. Awesome.

TomONeill said:
Okay, this problem has occured multiple times and today nothing happend and everything went how it should. Awesome.
Click to expand...
Click to collapse
Self-Healing
With battery drains though, it's better to check your Applications and see if you downloaded some apps that might be using too much battery. Go to Settings/Apps and select Apps running. This will show you what's running in memory.
MD

Thanks for your reply.
Yeah, it's self-healing xD
I did last week and I didn't notice any particular app eating too much RAM memory. I also checked the cached processes, but that wasn't a problem either. I did turn off some notifications from games I didn't play anyway, but that did not really help.
May I ask how much RAM you have left when having nothing running?
I have between 200-300 MB left, sometimes after a boot 300 to 400, but not really that often.
I'm running the stock ROM by the way.
Another thing: Do you have a SD card in your SD card slot? Cause every now and then since the JB update I get the notification "SD Card is inserted". Which I'm sliding away and it pops up back after having my tablet in stand-by modus for a few minutes (perhaps hours).
Edit:
I have to say that I have been installing a lot of apps, but that I deleted a lot of them 2 weeks back. Then I checked my sdcard data (internal data) for any traces of deleted apps, but I was quite surprised how little there was left of traces of deleted apps. Microsoft could learn from that (though it's not Microsoft who makes their uninstallers not fully deleting everything. But am going off topic now.). Could that may have effects on the RAM? I don't assume it will, but just FYI.

S7 freezes and reboots

I have the latest firmware on my S7 (exynos) and once every while the system freezes and then the phone reboots.
I don't know what's wrong with it.
Funny thing is my S5 with cm13 is WAY more stable than the S7...
Gesendet von meinem SM-G930F mit Tapatalk

I have tried few times in my previous S7. I guess it is the compatibility of app

My SD S7 does that when using the iheartRadio app - quite annoying

I'm on my second s7, the first would freeze and reboot regularly. Some folks here said they believed it was a software issue. I ended up exchanging it for a new one and haven't have had a single freeze or reboot since.

I Have it occasionally hoping an update fixes it

I have had mine for more than a week and so far no issues at all
Sent from my SM-G930F using Tapatalk

having the same extremely annoying problem on my g930fd (DUAL sim) nougat
several times even had a black screen with nothing responding anymore so I had to wait to drain the battery completely so the device could reboot
resetted, hardresetted, re-flashed, re-rooted numerous times ... with no sollution
NOW (april 1st) just had a new update from samsung GF930FXXU1DQB7/G930FOLBDQB8/G930FXXU1DQB1
anybody else experience with this last update ?

I'm having the same problem and wrote about it on a Reddit page where a number of other people are having the problem with their S7's also: https://www.reddit.com/r/GalaxyS7/comments/5xx705/after_nougat_s7_keeps_getting_unresponsive/
No solution so far
I wrote:
"I also have this problem with S7 on Nougat which started about 3 weeks ago. It seems to be getting worse.
A couple of times where I've ignored it the S7 got so hot I actually thought about keeping it away from my person. I can always force restart it by Power+Volume. Mostly I can wake it up by pressing the power button and the screen will light up after about 10 seconds of waiting, but nothing responds.
Once I had it happen while using the device. When this happened, I noticed that swiping down the notification bar sped everything up temporarily. If the notification bar was hidden the current application would be laggy. If I swiped down the notification bar partially the application would render quickly as normal.
I've also found that Google Maps and Spotify are the two main apps when this happens, but a common link for me is that either one will be connected to bluetooth in the car or bluetooth headphones. I don't think it's ever frozen without bluetooth being connected, but that could just be coincidence.
A strange thing is that Spotify stays playing songs and responding remotely when the S7 has frozen. If I have Spotify open on my laptop controlling music on the S7, I can still skip forward/pause/play etc for ages, although the songs start skipping audio after 10mins or so before stopping completely. It's like the System UI is the problem on the S7, and the app itself is still responding?
I'm wondering about doing a full reset but I'm dreading the several hours of setting everything back up, without knowing if it will solve the problem.
I use Lightflow and I'm going to try uninstall that for a week and see if I still get the freezing, simply because it is the only app that is continuously running on my phone in the notification drawer."

Re above, I did a factory reset as advised by Samsung support and the problem has gone away.

no solution, not alone
meanwhile I have tried several things
factory reset, swipe, root, no root
I noticed that the problem starts to appear when more and more memory is being used ...
no update from anybody else ?
meanwhile I read on the net this problem is not exceptional anymore, more and more people having this problem ...

Just posting to say it's been two weeks in total since i did the factory reset and I haven't seen the problem happen once since. Thankfully.

S7 and S7 Edge Micro SD / Eject Notification Issue

I sent my S7 to a Samsung authorized service repair center. Verdict: They need to replace the motherboard. Its officially an hardware issue, thus not affecting all devices. The ones that are affected needs replacement/or motherboard replacement. When they replace the motherboard, they have (no choice) to also replace the screen. Cost CDN 690$.
Its all over the web. Small number of units are affected though.
I wounder why Samsung just don't send me a new phone as their cost for a new device is around 240$ USD.

Can you describe more of your issue? I'm also getting a microsd/eject notification on every boot, but it can be cleared away and my microsd is usable/shown in settings->storage.

That's not a problem. Swipe it away and it's gone. It's a notification. Means nothing to performance. Why would that be means for a new motherboard. Does your card not read?
Sent from my SM-G930V using Tapatalk

On a reboot this is totally normal since the phone stops reading the sim as well as the SD. And then reconnect everything. My issue was that the notification was randomly coming back even when the phone was not rebooted. Plus, when I was accessing my music and /or pictures, the phone was sometimes freezing in the middle. Then I had to reboot. Then my music /pictures from SD was working for a while, then freezing again. No it was not just a swipe away fix. If the notification randomly comes back when the phone it means that the phone stopped reading it for a second /micro second and then reading it again (like if I had remove the tray and re introducing it.

jayb222 said:
That's not a problem. Swipe it away and it's gone. It's a notification. Means nothing to performance. Why would that be means for a new motherboard. Does your card not read?
Sent from my SM-G930V using Tapatalk
Click to expand...
Click to collapse
See above reply. No it was a motherboard issue.

Christian99 said:
On a reboot this is totally normal since the phone stops reading the sim as well as the SD. And then reconnect everything. My issue was that the notification was randomly coming back even when the phone was not rebooted. Plus, when I was accessing my music and /or pictures, the phone was sometimes freezing in the middle. Then I had to reboot. Then my music /pictures from SD was working for a while, then freezing again. No it was not just a swipe away fix. If the notification randomly comes back when the phone it means that the phone stopped reading it for a second /micro second and then reading it again (like if I had remove the tray and re introducing it.
Click to expand...
Click to collapse
Aha, I see. My fault for not seeing this post.

samsung s7 edge ejects sd card
Christian99 said:
On a reboot this is totally normal since the phone stops reading the sim as well as the SD. And then reconnect everything. My issue was that the notification was randomly coming back even when the phone was not rebooted. Plus, when I was accessing my music and /or pictures, the phone was sometimes freezing in the middle. Then I had to reboot. Then my music /pictures from SD was working for a while, then freezing again. No it was not just a swipe away fix. If the notification randomly comes back when the phone it means that the phone stopped reading it for a second /micro second and then reading it again (like if I had remove the tray and re introducing it.
Click to expand...
Click to collapse
I, too have this problem. When the sd card is unavailable, my apps that I store there are also unavailable.
Is this a bug? Will Samsung fix this?