Develop Bugs

[Q] Prevent screen wake when plugging in to charge

Hi XDA,
Recently my phone has come up with a problem with the USB charging port where it thinks it is charging when it is not plugged in every few seconds. This causes the screen to wake every few seconds and then turn off to sleep, then re-awake again repetitively, draining the battery very quickly.
I'm not sure of any way to fix this problem except maybe send it back to the manufacturer for warranty and repair (which is difficult for me to do as I have already voided the warranty through rooting), or maybe buy a replacement USB port and try fix it myself. Does anyone know of any other simple and effective ways for me to fix this?
Aside from this, in the meantime I would like to know if there is any way I can prevent the screen from waking up when the phone thinks it is being charged, thus when the phone does its charging/not charging cycle, it doesn't wake up the screen every 15-20 seconds and so won't lead my battery to drain from this.
Any help would be greatly appreciated, thanks!

Unroot, and flash stock then lock bootloader?
Sent from my Galaxy Nexus using Tapatalk 2

dmarmstr said:
Unroot, and flash stock then lock bootloader?
Sent from my Galaxy Nexus using Tapatalk 2
Click to expand...
Click to collapse
Hey, thanks for the reply. Unfortunately I am a bit of a noob at this and am unsure where I should go/what I should do to unroot, flash stock and lock bootloader. I think that would have to be a last resort though, is there not some way I could fix it myself? Is it purely a hardware issue? Also, in the meantime is there a way to prevent the screen wake issue?
Thanks

When we told people not to use toolkits....
Well at least learn after using it, and not just click away and forget about learning.
/end of small rant
Try to push the connectors in your microusb port sightly up(screen facing the sky)
If not use this: http://forum.xda-developers.com/showpost.php?p=27945515&postcount=128
Pressed from my Maguro

Mach3.2 said:
Try to push the connectors in your microusb port sightly up(screen facing the sky)
Click to expand...
Click to collapse
Can you be a little more descriptive here, or post a pic of this? I'm having the exact same issue but don't want to mess up my phone any more than it is.
On a side note, I called Samsung this afternoon to inquire about getting the phone serviced and after he told me that unlocked phones don't come with a warranty (I bought mine that way), he actually said that they couldn't repair it anyway because unlocked phones are actually built differently and use different parts. To which I laughed. But anyway, I now need to find a way to fix this problem.
Thanks.

corboto said:
Can you be a little more descriptive here, or post a pic of this? I'm having the exact same issue but don't want to mess up my phone any more than it is.
On a side note, I called Samsung this afternoon to inquire about getting the phone serviced and after he told me that unlocked phones don't come with a warranty (I bought mine that way), he actually said that they couldn't repair it anyway because unlocked phones are actually built differently and use different parts. To which I laughed. But anyway, I now need to find a way to fix this problem.
Thanks.
Click to expand...
Click to collapse
I actually did this with the edge of a cardboard card, ever so slightly but so far the problem seems to have gone away. Not promising anything though, and is probably only a temporary solution. I think what happens is the contacts between the connector in the middle of the port comes slightly into contact with the bottom through wear and tear over time and they short each other out, so by pressing it up a bit you prevent that from happening.

If you know how to decompile/recompile apk's...
/system/framework/framework-res.apk can be decompiled...
Then under /res/values/bools.xml/ you can edit the line "unplugTurnsOnScreen" to false.
I don't see a "plug in" version...but maybe this does both?
Either way...it cuts the amount of screen wakes in half.
I wouldn't recommend doing this, however...I'd get it returned.
Your problem might only get worse.

Same problem here, did you find a solution for that?
bumluffa said:
Hi XDA,
Recently my phone has come up with a problem with the USB charging port where it thinks it is charging when it is not plugged in every few seconds. This causes the screen to wake every few seconds and then turn off to sleep, then re-awake again repetitively, draining the battery very quickly.
I'm not sure of any way to fix this problem except maybe send it back to the manufacturer for warranty and repair (which is difficult for me to do as I have already voided the warranty through rooting), or maybe buy a replacement USB port and try fix it myself. Does anyone know of any other simple and effective ways for me to fix this?
Aside from this, in the meantime I would like to know if there is any way I can prevent the screen from waking up when the phone thinks it is being charged, thus when the phone does its charging/not charging cycle, it doesn't wake up the screen every 15-20 seconds and so won't lead my battery to drain from this.
Any help would be greatly appreciated, thanks!
Click to expand...
Click to collapse

[Q] Phone melted. Need to return. Rooted. What to do?

I'm a little concerned about my current predicament.
A month ago I bought a rooted Galaxy Note II second hand. I have had no problems with it until Saturday morning.
On Saturday I plugged it in - it was flat because the battery had ran out of juice from the previous night. I left it off and plugged in. I returned not long after to a slight burning smell, and the phone was roasting hot.
I could turn it on, but it hasn't charged, still showing 1% and cutting out immediately. Any time you plug in within seconds, it overheats.
It has burned in one spot, and burned the battery cover as well.
Obviously I am not impressed, it could have burned the place down if I'd left it on overnight.
However, the device has been rooted, and can be turned on but it will damage it more if you do. It has had a theme applied to it that could only be done with a rooted phone so it is blatantly obvious.
I've put in a support call with Samsung who are going to send out a bag to send it off to them in. I would have preferred to send them an unrooted phone, but obviously not practical and I don't know anyone else with a Note 2. I also don't want to buy replacement components in case I make it worse or damage those.
Anyone faced a similar predicament, and what was done about it?

Well, in this case, a melted phone is very dangerous, they should or must send you a new one just to not report it to the police or the media!
I think the problem was in the battery, it's the only component that can get so hot and even it can explode in some conditions.
Sent from my GT-N7100

My concern is they try to say that it was the fact the phone was rooted that caused it to overheat... although it was switched off at the time.
Don't worry I won't let it go without a fight, but am unsure about what rights I may or may not have.

tameracingdriver said:
My concern is they try to say that it was the fact the phone was rooted that caused it to overheat... although it was switched off at the time.
Don't worry I won't let it go without a fight, but am unsure about what rights I may or may not have.
Click to expand...
Click to collapse
Try to run triangle away, before you return it.
Sent from my GT-N7100 using xda premium

Phone is totally flat, and will only turn on when the battery is connected, and it is connected to the mains. It will overheat with a minute.

In Norway, and I assume in the EU too, they have to prove that there is a connection between the broken phone and the fact that it is rooted to void warranty. No worries then if there's similar legislature in your country.
Sent from my GT-N7100 using Tapatalk 2

What if you charge it with usb cable connected to a computer? Does it still overheat?
Alternatively, do you know any1 with a note 2 whos battery you can borrow?
Sent from my GT-N7100 using xda app-developers app

Try buying a spare battery. And then try triangle away. Put the faulty battery back in the phone and send it to Samsung.
It's way cheaper than having to pay for the full phone repair.

sos_sifou said:
Well, in this case, a melted phone is very dangerous, they should or must send you a new one just to not report it to the police or the media!
I think the problem was in the battery, it's the only component that can get so hot and even it can explode in some conditions.
Click to expand...
Click to collapse
tameracingdriver said:
My concern is they try to say that it was the fact the phone was rooted that caused it to overheat... although it was switched off at the time.
Click to expand...
Click to collapse
This thread's funny. A second hand phone received or bought rooted which could have been using a different kernel, been OC'd, or had any of a laundry list of mods done to it overheats. Since none of that can be ruled out, why is there any reason to alert the media or expect Samsung to be responsible for something that's most likely not a defect but customer induced damage? With millions sold I'd expect more reports of phone's melting if there was some sort of common or repeatable fault. Best of luck OP but your fate will be determined by Samsung's graciousness and not you claiming that a rooted second-hand device somehow combusted on its own having nothing to do with what you or the first owner did to it.

To be fair if it's not charging the battery at all and just overheating/melting the phone it sounds more like a hardware issue than a software one. Something in the charging circuit is screwed up by the sounds of it.
Sent from my GT-N7100 using xda app-developers app

tameracingdriver said:
My concern is they try to say that it was the fact the phone was rooted that caused it to overheat... although it was switched off at the time.
Don't worry I won't let it go without a fight, but am unsure about what rights I may or may not have.
Click to expand...
Click to collapse
idk if this help, last time my S2 also got some issue so I go to SC and the guy there said that I voided my warranty coz I rooted it.
And that statement made me angry, so I said to him in angry tone: why the hell you say its illegal to root and voided my warranty becoz I root my phone. If that's illegal, why the hell Superuser/SuperSU/any root tools exist in Google Play and Google let it in there for a long time? I bought this phone by my money so I have right to install anything in play store.
Then they unable to say something and fix my phone rightaway and told me to be careful next time.
So, rooting isn't illegal, its in Google Play anyway.

ask yr friends or someone borrow a battery and reset the counter first

I don't know anyone with an N2 so I can't borrow a battery, I'd have to buy one.
I'll try plugging it just into the computer, I suppose with less power going in, it might not overheat. I've been reluctant to plug it back in.
Phone is running standard kernel, it was only rooted, with a replacement status bar added, and CWM installed. Nothing special.
Ideally, I would need to flash it back to standard though, so I'll need to find out the easiest / quickest way to do this, and, possibly, reset the counter.
I suppose its possible they will refuse to fix it. If I am, that is me massively out of pocket, and I won't be rooting anything ever again, even buying second hand is losing its appeal.
Heck, as I can't afford to replace it, I now may be stuck with this Nokia Lumia 800 I had to buy as an "emergency" phone, which is actually not a bad little machine in many respects (obviously tiny though).

tameracingdriver said:
I'm a little concerned about my current predicament.
A month ago I bought a rooted Galaxy Note II second hand. I have had no problems with it until Saturday morning.
On Saturday I plugged it in - it was flat because the battery had ran out of juice from the previous night. I left it off and plugged in. I returned not long after to a slight burning smell, and the phone was roasting hot.
I could turn it on, but it hasn't charged, still showing 1% and cutting out immediately. Any time you plug in within seconds, it overheats.
It has burned in one spot, and burned the battery cover as well.
Obviously I am not impressed, it could have burned the place down if I'd left it on overnight.
However, the device has been rooted, and can be turned on but it will damage it more if you do. It has had a theme applied to it that could only be done with a rooted phone so it is blatantly obvious.
I've put in a support call with Samsung who are going to send out a bag to send it off to them in. I would have preferred to send them an unrooted phone, but obviously not practical and I don't know anyone else with a Note 2. I also don't want to buy replacement components in case I make it worse or damage those.
Anyone faced a similar predicament, and what was done about it?
Click to expand...
Click to collapse
Given the near fatal consequences of a battery explosion you shouldnt have any problems Samsung will be much more interested in working out why it happened and avoiding any negative PR about their flagship handset.
However if they can proove that it was the root that caused the burn out (we all know thats not the likely reason) then they may reject the device and tell you it was all your fault. at that point take it to the media.
to me it sounds like the charging circuit has failed and instead of passing charge to the battery its built up in the circuit, mechanical failure can't see how a root would cause that. Were you using the sammy charger, cable and battery?
---------- Post added at 10:31 AM ---------- Previous post was at 10:28 AM ----------
D3_ said:
To be fair if it's not charging the battery at all and just overheating/melting the phone it sounds more like a hardware issue than a software one. Something in the charging circuit is screwed up by the sounds of it.
Sent from my GT-N7100 using xda app-developers app
Click to expand...
Click to collapse
Ye that was my thought wonder if OP has original sammy cable and charger or was given a third party one?

Yes I did indeed use the original charger and cable (it looks original too, not like a knock off). In general, in the past, I've had issues using chargers mean't for other devices, usually just slow charging though rather than it blowing up.
The fact the phone was turned off when it was being charged suggests to me, like you say, that its a proper hardware fault.
We shall see. I'm waiting for the jiffy bag to send it back, it will be at least 2 weeks till I get it back (maybe longer now with Xmas coming up).

tameracingdriver said:
My concern is they try to say that it was the fact the phone was rooted that caused it to overheat... although it was switched off at the time.
Don't worry I won't let it go without a fight, but am unsure about what rights I may or may not have.
Click to expand...
Click to collapse
Take a picture of the burned note2 first, maybe you can use it as a "leverage" when the time comes. You know how burned phone have negative impact on products marketing.

[Q] Rooted Motherboard Issues?

Knowing that this is my last resort and with all the wonderful knowledge here on the forums, I'm hoping I might get some creative ideas.
I recently bought a Tab S 8.4, rooted it about 2 weeks after I got it. No problems, everything is working great. Last week, the screen starts to flicker and the tablet reboots randomly. When it does this, the battery goes from 100% down to 12%. Eventually this happens enough where the tablet won't stay on for longer than a minute. Read around the forums and find others mention the exact same issue. Potentially a battery pull/re-plug may alleviate. Tried that to no avail.
I have found that if I hold the battery plug in place *real* tight, by pushing down with my finger, the tablet operates somewhat normally. Could be a motherboard issue.
Anyone run into this at all? Thoughts? Ideas? Replacement parts? I've got a $500 brick on my hands now with no warranty to boot. :crying:
Thanks in advance!

I soldered my battery straight to the board. But before doing that, try spraying some contact cleaner (found in hardware stores) and see if it Will work

hey, i got this issue once ! go to customer service,they will fix it for you in 5min FREE !

sku|| said:
hey, i got this issue once ! go to customer service,they will fix it for you in 5min FREE !
Click to expand...
Click to collapse
Which customer service are you referring to? A local samsung customer service?

Squez said:
Which customer service are you referring to? A local samsung customer service?
Click to expand...
Click to collapse
yes, samsung service center

sku|| said:
yes, samsung service center
Click to expand...
Click to collapse
So they took off the back cover and soldered it back in for you for free with no warranty? I'm a bit surprised they would do that. I'll have to see if I have one in my area.

Please keep us updated
Squez said:
So they took off the back cover and soldered it back in for you for free with no warranty? I'm a bit surprised they would do that. I'll have to see if I have one in my area.
Click to expand...
Click to collapse
Hey Squez please keep us informed and if you get this problem resolved. I am not gonna root my Tab S until I know its safe to do so... thanks and good luck.

TeeShark said:
Hey Squez please keep us informed and if you get this problem resolved. I am not gonna root my Tab S until I know its safe to do so... thanks and good luck.
Click to expand...
Click to collapse
I found a local electronic repair shop that said they could re-solder it for me relatively easily. Brought it in and he said it did look like the terminals on the battery plug had been pulled back a little bit and weren't soldered on there very good (good to hear some type of confirmation on that and he let me view it through a microscope as well). Twenty minutes and twenty dollars later, my tablet is working as it did previously. I've used it sparingly over the last 2 hours, so nothing definitive yet, but the fact that it doesn't restart right away makes me think the issue is resolved.
Thanks everyone for the suggestions!!

Sweet

Squez said:
I found a local electronic repair shop that said they could re-solder it for me relatively easily. Brought it in and he said it did look like the terminals on the battery plug had been pulled back a little bit and weren't soldered on there very good (good to hear some type of confirmation on that and he let me view it through a microscope as well). Twenty minutes and twenty dollars later, my tablet is working as it did previously. I've used it sparingly over the last 2 hours, so nothing definitive yet, but the fact that it doesn't restart right away makes me think the issue is resolved.
Thanks everyone for the suggestions!!
Click to expand...
Click to collapse
eh? 20dorra ??

Squez said:
I found a local electronic repair shop that said they could re-solder it for me relatively easily. Brought it in and he said it did look like the terminals on the battery plug had been pulled back a little bit and weren't soldered on there very good (good to hear some type of confirmation on that and he let me view it through a microscope as well). Twenty minutes and twenty dollars later, my tablet is working as it did previously. I've used it sparingly over the last 2 hours, so nothing definitive yet, but the fact that it doesn't restart right away makes me think the issue is resolved.
Thanks everyone for the suggestions!!
Click to expand...
Click to collapse
Glad to hear you got it working bro.. seems.like a samsung quality or even design issue, they got plenty of space yet decided to use a very small terminal

Battery Results
Just wanted to follow up with everyone that might be experiencing similar issues. After fixing the issue, and de-bloating a bit, my battery life is phenomenal. Much better than when I first got it. I suspect the battery issue was causing some drain as well, even when it wasn't restarting. The attached screen is still with 35% battery left.

Thanks to all those who contributed to this thread. I too was having battery issues. I'd get random restarts, disconnects from the cellular network, forgetting wifi passwords, battery that would go from 50% to dead in three seconds., display glitches etc. I finally opened up my tab which I thought was going to be a pain but was actually pretty easy. By naked eye the solder joints looked fine but under a microscope I could see that all six solder joints on the battery connector were cracked and by pressing on the connector could see the connector move independently from the PCB. Resoldered the joints and everything is good now.

Well my problem is that the battery isn't charging, I get a battery with a red "X" mark when the screen is on but when it is turned off, its charging well but very slow and when it reaches 99% it never goes to 100%. Could it be possible I have the same problem as you guys? no random restarts for me just the issue of sucky battery life (3 hours on wifi) and not charging
Squez said:
Just wanted to follow up with everyone that might be experiencing similar issues. After fixing the issue, and de-bloating a bit, my battery life is phenomenal. Much better than when I first got it. I suspect the battery issue was causing some drain as well, even when it wasn't restarting. The attached screen is still with 35% battery left.
Click to expand...
Click to collapse
Which bloat apps did you exactly remove?

drmodify said:
Well my problem is that the battery isn't charging, I get a battery with a red "X" mark when the screen is on but when it is turned off, its charging well but very slow and when it reaches 99% it never goes to 100%. Could it be possible I have the same problem as you guys? no random restarts for me just the issue of sucky battery life (3 hours on wifi) and not charging
Which bloat apps did you exactly remove?
Click to expand...
Click to collapse
Are you using the stock Samsung charger? Just plug it into the wall and it should be fine. Don't charge from the computer or use a different charger

Got that same problem. My tab will only charge up to 60% under 6 hours. Batterystatus app shows that my 2amp wall charger is just charging at 300mah +/- . Tried my power bank, same issue. Changed the cable and the reading from the wall charger is 1800mAh , could top up the battery in 2hrs

DUHAsianSKILLZ said:
Are you using the stock Samsung charger? Just plug it into the wall and it should be fine. Don't charge from the computer or use a different charger
Click to expand...
Click to collapse
Using wall charger. Never charged via pc...
Any Ideas?

I have experienced this. Flickering of the screen which eventually leads to reboots. Got it fixed at a samsung service center. You rooted it but you're on stock ROM right? I think there's a problem when we root it and stick with the stock ROM. When I rooted my tab again, certain apps started FCing which lead to lags. So I'm gonna wipe this and start from scratch.

tab gets flickering screen and reboots

I dropped by tablet battery down once and now every so often the screen flickers with vertical lines and this is followed by loss of network and the thing reboots.
I've read this to be a battery problem.
Warranty is still active but I've rooted it and my Knox counter has gone up.
What do you think XDA? Just get a replacement battery?

NightShadow02 said:
I dropped by tablet battery down once and now every so often the screen flickers with vertical lines and this is followed by loss of network and the thing reboots.
I've read this to be a battery problem.
Warranty is still active but I've rooted it and my Knox counter has gone up.
What do you think XDA? Just get a replacement battery?
Click to expand...
Click to collapse
If you have the ability, since it was dropped, I would open it and make sure connection is tight to battery and screen. Then if it still acts up, get a battery. Several people had battery issues out of the box. All it turned out to be for a few was a loose connection.

i was thinking about that but i'm afraid of voiding warranty. do i even still have warranty? due to the knox?

flhthemi said:
If you have the ability, since it was dropped, I would open it and make sure connection is tight to battery and screen. Then if it still acts up, get a battery. Several people had battery issues out of the box. All it turned out to be for a few was a loose connection.
Click to expand...
Click to collapse
Well ive opened it up and tightened everything i can see and it seems to work ok for a while, when the charge gets to around 20-30%, the tablet flickers, all mobile connections are lost and 75% of the time, reboots.
So i went ahead and got a new battery. Now this was worse kinda. At random moments, like unlocking the screen, or replying to a message, or maybe just a high cpu load event, the tablet just turns off and is unable to be powered back on without first connecting it to a power supply like a wall charger or a power bank.
The time and date will be reset once its back on and ill have to wait a few minutes before the auto network time setting kicks in before i can use something like whatsapp.
Anyone got any clue what might be causing this problem? Thanks in advance, helpful xdarians.

NightShadow02 said:
Well ive opened it up and tightened everything i can see and it seems to work ok for a while, when the charge gets to around 20-30%, the tablet flickers, all mobile connections are lost and 75% of the time, reboots.
So i went ahead and got a new battery. Now this was worse kinda. At random moments, like unlocking the screen, or replying to a message, or maybe just a high cpu load event, the tablet just turns off and is unable to be powered back on without first connecting it to a power supply like a wall charger or a power bank.
The time and date will be reset once its back on and ill have to wait a few minutes before the auto network time setting kicks in before i can use something like whatsapp.
Anyone got any clue what might be causing this problem? Thanks in advance, helpful xdarians.
Click to expand...
Click to collapse
I'm not by any means an expert or repairman of any kind, just so you know. I'm thinking maybe a loose connection at the terminals on the board the battery connects to or if they use a separate board for the battery to connect to and then to the main board it may be somewhere along in there. Maybe a loose wire going into the tab that connects to the prongs. It sure sounds like something isn't making a good connection. Sounds like a load gets put on it and it and that bad connection can't handle the load.
Might just be you're going to have to send it off...

You may be right. Sounds like a particular connection which does higher load or something. Once i put the tablet in power save mode, the symptoms never reappeared. I dont notice a drastic slowdown in the tablet either. Probably am prolonging the inevitable.

Same Symptoms
NightShadow02 said:
You may be right. Sounds like a particular connection which does higher load or something. Once i put the tablet in power save mode, the symptoms never reappeared. I dont notice a drastic slowdown in the tablet either. Probably am prolonging the inevitable.
Click to expand...
Click to collapse
I am facing exactly same issue what you have described and am in same situation, have tripped Knox on my Tab S 8.4.
I can see that you have been able to suppress the behavior by putting it to Power Saving mode. Have you experienced flicker and reboot since then? I am planning to take it to Samsung store not sure if they will honor warranty, did you tried that?

misrasandeep said:
I am facing exactly same issue what you have described and am in same situation, have tripped Knox on my Tab S 8.4.
I can see that you have been able to suppress the behavior by putting it to Power Saving mode. Have you experienced flicker and reboot since then? I am planning to take it to Samsung store not sure if they will honor warranty, did you tried that?
Click to expand...
Click to collapse
nope, ever since the Power Saving mode solution, it hasnt flickered and rebooted yet. and my warranty was expired by that point so i didnt bring it to the shop. no noticable reduction in performance so far

possible battery connector
NightShadow02 said:
Well ive opened it up and tightened everything i can see and it seems to work ok for a while, when the charge gets to around 20-30%, the tablet flickers, all mobile connections are lost and 75% of the time, reboots.
So i went ahead and got a new battery. Now this was worse kinda. At random moments, like unlocking the screen, or replying to a message, or maybe just a high cpu load event, the tablet just turns off and is unable to be powered back on without first connecting it to a power supply like a wall charger or a power bank.
The time and date will be reset once its back on and ill have to wait a few minutes before the auto network time setting kicks in before i can use something like whatsapp.
Anyone got any clue what might be causing this problem? Thanks in advance, helpful xdarians.
Click to expand...
Click to collapse
I have seen this problems on 2 tablets 10.5 and 8.4 the connector where battery is connected on motherboard gets loose which causes reboots and flicker
Solution in my case was resoldering that connector again

i had the same problem, opened up my tablet, just disconnected the battery, cleaned the contacts, pushed it back, made sure its nice and snug, put it all back together and now battery doesn't drain as fast, no more flickers and reboots!

hmm. i'll have to give it a try. you think this may be something to do with condensation?

Sorry for the bump, but I'm having this issue as well on my S 8.4. Custom ROM. The thing with me is that it's not consistent. One day, it will do it a few times; others, no issues whatsoever. I'll try the suggested if it gets progressively worse.

Hey guys,
Unfortunately our home's tablet (Tab s 8.4 Wifi) has the same problem.
It never did weird whatshowever, but when I flashed a custom rom (which went perfectly smooth actually) the screen flashes and the tablet reboots sometimes.
Now it weird that this never happened before and only when I flashed a custom rom it began showing this behaviour.
I am affraid of opening this tablet, and I guess because of the custom rom there is no warranty left anymore (or can this be bypassed by some terminal trick?)
Also I question myself if this is not a software issue, and that it can be fixed with software or so?
Thanks for answering!

My Fix
Hey Guys!
I might have some surprising news to tell about this "issue".
I saw some unboxing video's and saw at what place the battery connector was placed. It was some sort of a 'push to click' system.
So what I did was the following:
I pushed the tablet at the place of the battery connector. I tried this at various places until I heard a *click*.
Now I don't have this issue anymore. Jay!
I hope this will help you too!

I started to have the same issue on a Tab Pro 12.2, presumably after the battery has lost considerable amount of its energy. Normally I remember this tablet to have a dazzling 10+ hours of usage time. Just after some serious usage time of more than 2 years this issue started, along with increasing temperature and finally reboot. From time to time Android gave a warning message about overheating. From time to time charge values drop big values at a time. From 45 to 20 or 80 to 50. Seems arbitrary. This was happening even when I was on stock, then I switched to some Android 6 stock port from some other tablet. Still the same.
I believe the battery needs replacement. (That's obvious after 18 months, I just mean blinking is related to this) Hope I can find a high quality one cause there are several garbage batteries.

[Q] Tab S signal loss and reset problem

Hi,
My t705 has found a new problem.
It constantly loses mobile signal and brings back the signal a few moments later.
At the time when the signal is lost, if i touch the screen, dark bars appears vertically on screen and vanishes in a blink of eye and if i continue touching and working with screen, the tablet resets.
Not to mention I have no problem if the device is connected to the power source. I mean when it is charging, the device is working perfectly. When i disconnect from the charger, the problem rises again, no matter at which level the battery is charged.
I tired, safe mode, removing sim, selecting gsm only, wcdma only, factory reset, removing sd memery non of the seems to fix the problem.
I am using Android 5.02.
What do you suggest?

I have the same problem too, is it due to battery problem?

I found the information in the link below, it says it`s for the T800and T805, But it should work for the T700 and T705 just the same, be careful i take no responsibility for any damage you do.
http://www.hard-reset.org/factory-d...fi-lte-sm-t800sm-t805-with-safety-hard-reset/
John.

random reboots and green line flickring
nothing going to work as its a hardware problem
replace the tab asap
and if u void ur warrenty than go to any good mobile repair shop
nd ask them to solder ur battery connector to the motherboard
this is the only nd 100% working solution

How can it be a hardware problem if it happens only after software update?

Im currently having this problem as well. It happened to me before and after the lollipop update. I thought it was the battery so i went to buy and install a new battery.
The flickering lines and mobile connections resets have stopped but now it just randomly shuts down and cannot be turned back on unless being connected to a pkwer supply like a wall charger or a power bank. I have not yet found a solution to this problem.
---------- Post added at 05:42 PM ---------- Previous post was at 05:40 PM ----------
saddabas said:
nothing going to work as its a hardware problem
replace the tab asap
and if u void ur warrenty than go to any good mobile repair shop
nd ask them to solder ur battery connector to the motherboard
this is the only nd 100% working solution
Click to expand...
Click to collapse
Could you provide more details about this solution? Like pictures of the connections or just descriptions will do. My device has been knox-tripped and i think claiming warranty wouldnt do anything. I didnt expect samsung to make such a faulty device which has crappy connections which fail within a year. ��

saddabas said:
nothing going to work as its a hardware problem
replace the tab asap
and if u void ur warrenty than go to any good mobile repair shop
nd ask them to solder ur battery connector to the motherboard
this is the only nd 100% working solution
Click to expand...
Click to collapse
I opened the back cover and disconnected and reconnected the battery connector, seemed to solved the problem for a day or less but then again it came back. Not to mention i broke part of the connector while disconnecting it and now the connector does not connect to the motherboard easily, unless I press it hardly. I fixed the problem by putting a thick peice of paper between back cover and connector.
But our main problem is still there. So you say we can solve it by soldering the connector to motherboard?

It seems to be common for Samsung Tablets for the display connector to become loose and even come unplugged due to an drop or bending of the case while no damage to the outside is evident.
I suppose the power connector could come loose as well, there are a number of video`s on Youtube of the connector being off, when the case is opened.
John.
Below shows how to replace the battery on the T705 , Video`s for other version as available.
I can find the battery for my T800 on Ebay for £9 and the pry tool for £1 , or you can pay $60 to newpower99 for the whole kit.
https://www.youtube.com/watch?v=eIbpBImYtYw
https://www.newpower99.com/category_s/287.htm