Problems with touch screen when screen is locked and phone is charging... - T-Mobile Samsung Galaxy S II SGH-T989

Since I thought my phone, I've noticed an annoying problem. When my phone is charging in the screen is locked, I go to unlock the phone and the touch screen seems to have a problem registering my touch for the pattern password.
I would unplug it for a second to draw the unlock pattern, unlock the phone, and then proceed about while the phone is plugged back in. Then out of nowhere, it'll do the same thing.
Anyone experiencing this?
Sent from my SGH-T989 using XDA App

m3trella97 said:
Since I thought my phone, I've noticed an annoying problem. When my phone is charging in the screen is locked, I go to unlock the phone and the touch screen seems to have a problem registering my touch for the pattern password.
I would unplug it for a second to draw the unlock pattern, unlock the phone, and then proceed about while the phone is plugged back in. Then out of nowhere, it'll do the same thing.
Anyone experiencing this?
Sent from my SGH-T989 using XDA App
Click to expand...
Click to collapse
There is another thread here somewhere that talks about the issues while being plugged in. I think this was one that was mentioned.
Sent from my SGH-T989 using xda premium

i am not getting that problem, but if you call tmobile im sure they will switch the phone.

I've had this problem - but only when I used a different charger from the one included (even though it's a Samsung charger). Are you using the cable included with the phone?

Yea it has happened on mine but only if it was laying down when i try to unlock it. once i pick it up it was fine
Sent from my SGH-T989 using XDA App

I can confirm this very issue on two GSII's I've used. It's annoying.
Sent from my SGH-T989 using XDA App

This is a known issue with all variants of the Galaxy S2.
The Galaxy S2 is very sensitive to input voltage, and if it doesn't like what it's getting, the touch screen calibration gets a little funky.
Voltage-regulated chargers (ones that are big and blocky or have a bulb on the wire) tend to work well.
Don't bother exchanging it over this, it won't change anything. You just need a better charger.

Yes, I'm using the same charger came with the phone. I guess we will just settle this issue with the fact that it just gets a little funky When plugged in.
Sent from my SGH-T989 using XDA App

Big thanks to everyone who responded to this thread, hopefully we can figure out what the problem is in the near future
Sent from my SGH-T989 using XDA App

manekineko said:
This is a known issue with all variants of the Galaxy S2.
The Galaxy S2 is very sensitive to input voltage, and if it doesn't like what it's getting, the touch screen calibration gets a little funky.
Voltage-regulated chargers (ones that are big and blocky or have a bulb on the wire) tend to work well.
Don't bother exchanging it over this, it won't change anything. You just need a better charger.
Click to expand...
Click to collapse
better charger yes
phone being sensitive not really
all Properly build chargers will not cause that problem
i purchase cheap 2A charger from Deal Extreme, but those are build good, not like some of the crappo accessories from ebay
BlackBerry chargers works good too

I have the same problem.
As many of you guys said, a good charger is needed for a stable voltage input.
I have no problems charging from the original charger and my desktop computer.
However the problem shows when I am using my laptop (7 year old) usb.
So a good charger is recommended.

I can confirm this issue, but what i want to know is, why does this happen when the phone is lying flat on a surface while charging and goes away the moment you pick it up? If it was a faulty or imprecise charger issue then the problem should persist?
My guess is it has to do with the EM shielding around the charging module, and that it doesnt do enough to shield the totally normal residual interference from interfering with the touch screen digitizer. When we pick it up, our hand acts as an interference dampener and minimizes the issue while it is charging, to almost negligible amounts. But its just a guess. The chargers might also be generating greater than average interference as well. But just charger alone cannot explain why pickibg up minimizes the problem.

The charger doesn't cause any erratic behavior on my Galaxy Nexus like it does on this phone... So what is the explanation behind that?
Sent from my SGH-T989 using xda premium

manekineko said:
This is a known issue with all variants of the Galaxy S2.
The Galaxy S2 is very sensitive to input voltage, and if it doesn't like what it's getting, the touch screen calibration gets a little funky.
Voltage-regulated chargers (ones that are big and blocky or have a bulb on the wire) tend to work well.
Don't bother exchanging it over this, it won't change anything. You just need a better charger.
Click to expand...
Click to collapse
Use the charger that came with the phone
Sent from my Hercules using XDA App

What's unfortunate is that the Samsung charger that came with the device causes the touchscreen issues.
Fortunately, I have an HTC charger lying around that works, no problems.

I have seen this happen with the HD2, Evo 4g, galaxy s4g & Sensation. Its a problem with chargers and the voltage. It happens with those chargers from walmart. Its not just the GS2 phones.
Sent from my SGH-T989 using XDA App

Add the Tmo HD7 to the list.... it happens all touchphones on which i believe has grounds surrounding the phone, touching the touch screen stabilizer or whatever you'd like to call it. It's the ground of the charger, nothing to do with charger instability. Take your laptop's charger, plug it into a wall with no 3rd ground (a laptop that has the 3rd prong) and take that same plug, and plug it into a plug with 3 prongs, you'll notice it has that static-like feeling that makes ur fingers tingle (when you touch a metal part of your laptop). It's the same issue with our phones
I hope this helps someone

Just change charger i have noticed that since i work in a cellphone company .... but i change to a different charger and it stopped doing that....

I used another charger but the problem still exist

Related

Is there a program to lower charging amp?

I am absolutely sick of the phone being pretty much unuseable when charging through an ac outlet. I did some searching and the consensus seems to be its either from the charger itself or the ui.
I'm currently using battery widget pro and I'm not sure if there's a way to lower the charging ma to something lower to make the phone still useable while still charging it. Or if there are such programs out there?
I think charging through a laptop usb charges at a lower ma
Sent from my SPH-D710 using xda premium
I use my girlfriend's Blackberry Curve charger and it's perfect. It does take longer to charge but I can use the phone like normal. I'm guessing it's because the Blackberry has such a small battery that it demands much less power.
Sent from my SPH-D710 using xda premium
Yeah.. I'm just looking for a way to still use my phone while at work and near my bed not near my computer. But, I just won an auction like this one..
http://www.ebay.com/itm/USB-MICRO-W...210902?pt=PDA_Accessories&hash=item4cfb27e796
Hopefully it'll be slow charging since I only paid $0.60 shipped for it lol. Thanks for the input everyone.
My phone is competely usable while charging. I don't understand the problem you are having.
Is it because it gets hot? I have it plugged in near my bed all the time and before bed I'll load up a little Angry Birds and sometimes I'll check my email when I wake up and it's perfectly usable plugged in. Gets a little warm when gaming though I guess.
No problems here using with charger...
Bobby O'S Epic Touch..
Any other charger works perfect. I just use one of my 3 Epic chargers
Sent from my Nexus S 4G using xda premium
A lot of people report the touch screen bugging out when connected to the factory Samsung charger. I can't even unlock my phone using the stock charger. People speculate that it uses such a high amperage that it interferes with the touch screen somehow. When I use my old HTC charger I have a 50/50 chance of using the touchscreen for a few minutes before it acts up,but it eventually does act up. The Blackberry Curve 3G charger has been the only one that works perfectly for me.
Sent from my SPH-D710 using xda premium
This problem is very hit and miss for all touchscreen phones. Well capacitive touchscreen phones at least. It's normally not the charger - it's your ground. In case anyone doesn't understand how capacitive screens work I suggest using Google to read up.
The grounding can work two ways.
1: The electrical source is not grounded very well. This can cause the screen to register 1 touch as multiple inputs in multiple areas. Picture it as a mini electrical storm on your screen.
2: The user is grounded. Go ahead, test it. If you're grounded how do you expect the electrons to transfer from you to the screen? In this case the screen will fail to register input.
Try moving when the screen is going crazy, or not working. Go to a different spot or plug it in to a different outlet. If none of this works, then you have a busted charger (or where you are is wired poorly - get that checked).

Touch screen misbehaving while charging

running cm7.1. Had this problem crop up randomly back on 7.0 or maybe on 7.1rc. Wiped and did a fresh install. It's as though, when plugged in, my touchscreen doesn't exactly understand what I am doing. Every few touches will result in a stray random touch elsewhere on the screen. Anyone got any advice?
Sent from my ADR6300 using XDA App
For what it's worth, the problem is more pronounced the lower my battery is. Charging above 70 is no problem, while below 30 it becomes practically unusable. I am running SETCPU with defaults.
Sent from my ADR6300 using XDA App
gornul said:
for what it's worth, the problem is more pronounced the lower my battery is. Charging above 70 is no problem, while below 30 it becomes practically unusable. I am running setcpu with defaults.
Sent from my adr6300 using xda app
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Click to collapse
is this an htc charger or a 3rd party charger?
The reason i ask is because a co worker of mine bought a cheap 3rd party charger from the flee market and when he tried to charge his phone the light would come on but the screen would do what your describing. I didnt believe him so i plugged my phone into it and my screen wouldnt work at all. Let him borrow my charger that was an htc charger and it didnt do it at all.
That'd do it. Coworker destroyed my HTC charger and bought me a Verizon branded chinese-made piece of crap, and now that you mention it this doesnt happen when charging via my car.
Sent from my ADR6300 using XDA App

Screen doesn't respond to the touch

Well, it seem every phone I use in last 6 month getting this disease when you swipe or touch on screen and nothing happens, or when you press one key on keyboard and it inputs completely different character from opposite side of the screen...
Just now I had the same exact crap going on on Nitro!
I pressed and hold on back button on the gb keyboard and it was acting like I'm pressing random keys at 50 keys per second!
But before that I had trouble unlock the phone, since the slide off motion didn't register at all, the slider would move a few pixels and go back.
The weird fact is the most noticeable this occur when phone is plugged in and charging, unplug it and problem usually goes away or at least become manageable.
What the hell I'm doing to these phones that causing this? Actually this is the first phone where I f.k with the system files, all others I either used CWM or market, nothing else.
I have not had any touch screen issues with this phone other than its just a hair less sensitive compared to my captivate.
[email protected], are you a ghost? I have heard that sometimes phones will act strangely during use if you are a ghost. Something to do with spiritual electromagnitism. This would also explain why you are having compass issues!
Okay, so back to being serious. I've had the EXACT same issues you speak of when my phones (yes, this has happened to other phones too) were connected to 'dirty' power.
What I mean by 'dirty' is either a power supply that was very low quality or using a USB cable that the phone didn't like. Just recently my Nitro was acting erratically while I have it plugged into my computer. It shouldn't have been a problem because I was using a high quality, well shielded Blackberry branded cable (worked perfectly fine with my Nexus One), but as soon as I used the usb cable that came with the Nitro then everything worked correctly again.
Hope this helps!
i had that promblem today ... but nothing i did fixed it so i was able to pull the battery and do a dreded hard reset and its working as good as gold now
tokie_ said:
i had that promblem today ... but nothing i did fixed it so i was able to pull the battery and do a dreded hard reset and its working as good as gold now
Click to expand...
Click to collapse
Just got the same problem. Tried everything listed here to fix it. No luck.
Any other suggestions ?
I've found what Namuna said to be true. Also, I experienced this issue with my phone plugged into the power strip on the nightstand. Apparently there is a grounding issue in that power strip.
Sent from my LG-P930 Full Android on Emulator using xda app-developers app
AllstarE4 said:
I've found what Namuna said to be true. Also, I experienced this issue with my phone plugged into the power strip on the nightstand. Apparently there is a grounding issue in that power strip.
Sent from my LG-P930 Full Android on Emulator using xda app-developers app
Click to expand...
Click to collapse
Could be it. I use a power bar also. Plus I think I'm using a cable from a galaxy nexus now that I think about it.
Maybe I'll try to find an official lg cable.
Thanks again.
Sent from my LG-E973 using xda app-developers app
khanfed said:
Could be it. I use a power bar also. Plus I think I'm using a cable from a galaxy nexus now that I think about it.
Maybe I'll try to find an official lg cable.
Thanks again.
Sent from my LG-E973 using xda app-developers app
Click to expand...
Click to collapse
I haven't had a complete loss of touch responsiveness, but I have experienced the erratic behavior; but only when plugged in and only while charging in AC mode. I've noticed this a lot more since I dropped my phone with the charging cable attached... I can be in USB mode and the slightest touch will knock it off charge yet I have no touchscreen problems. Once, every now and then, I am lucky enough to get into fast charging AC mode; which is much more stable as far as touching and using while charging... but the screen is almost unusable due to the erratic touches. I turned on "show touches" in developer options and while in AC mode, it shows multiple touches in a horizontal line relative to where my finger is. It even affects my soft keys.
Happens with every charger I've tried; my original charger, both HTC chargers I have, and a charger I found a few weeks ago. I've experienced the problem in my house, multiple hotels, and a few other places; both with and without a power bar. Pretty much, what I'm saying, I'm sure I've been connected to a good grounded source of power, yet I still experienced those problems.
Out of curiosity... have any of you either replaced or had your digitizer replaced? I've replaced mine twice, and my problems began shortly after cracking the screen the 2nd time.
Well i tried the charger that came with my optimus g (using a power bar ) and it seems to work fine now.
One more thing i did was try it without my memory card for a bit. I don't know if that had anything to do with it also.
Anyways so far so good.
Sent from my LG-P930 using xda app-developers app

Phone shows charging and not plugged in

My phone charges fine but even after unplugging it still shows that its charging.
Any suggestions? Anybody else?
Sent from my Galaxy Nexus using xda premium
i wouldnt worry about it. every once in a while if my phone is on standby it goes up by 1%. also why does yours say 2s on time?
It connects and disconnects. It just started yesterday....
My screen will turn off and on sometimes like I'm connecting it to my charger.
See the green charge bar and top right battery shows its plugged in.
Sent from my Galaxy Nexus using xda premium
More and more people are seeing this kind of problems. See http://forum.xda-developers.com/showthread.php?p=21840063#post21840063
It's a faulty USB connector on the phone, you should have it serviced, or change it yourself.
I bought this: http://www.ebay.com/itm/ws/eBayISAPI.dll?ViewItem&item=150713366355 and it fixed it.
Melhouse said:
More and more people are seeing this kind of problems. See http://forum.xda-developers.com/showthread.php?p=21840063#post21840063
It's a faulty USB connector on the phone, you should have it serviced, or change it yourself.
I bought this: http://www.ebay.com/itm/ws/eBayISAPI.dll?ViewItem&item=150713366355 and it fixed it.
Click to expand...
Click to collapse
Oh no, same problems with my phone. How difficult is it to change it?
Sent from my Galaxy Nexus using xda premium
Not that hard. It's the easiest board to change on the phone. Look at some disassembly videos on youtube.
I did get bad GSM reception after changing the board though, but I just used a scissor to cut out the antenna part of the old board and used that instead. Could be that the board was a CDMA one. Anyway, now the phone is good as new!

Screen sensitivity greatly lowered when on charge?

Hey guys, has anyone else had this strange problem that when on charge, the screen definitely becomes less responive, harder to type on, and the main screen becomes laggy and must be swiped edge to edge on the screen to scroll apps. This can't just be me D:
Running latest 1.29.401.11 unrooted and on stock Rom.
Sent from my HTC One X using XDA App
theslugman said:
Hey guys, has anyone else had this strange problem that when on charge, the screen definitely becomes less responive, harder to type on, and the main screen becomes laggy and must be swiped edge to edge on the screen to scroll apps. This can't just be me D:
Running latest 1.29.401.11 unrooted and on stock Rom.
Sent from my HTC One X using XDA App
Click to expand...
Click to collapse
Try a different charger.
I am using the official HTC charger, and same thing happens when I used other people's different chargers, but only started happening with the latest update
Sent from my HTC One X using XDA App
theslugman said:
Hey guys, has anyone else had this strange problem that when on charge, the screen definitely becomes less responive, harder to type on, and the main screen becomes laggy and must be swiped edge to edge on the screen to scroll apps. This can't just be me D:
Running latest 1.29.401.11 unrooted and on stock Rom.
Sent from my HTC One X using XDA App
Click to expand...
Click to collapse
Its your charger, turn on show touches in developer options and see where it is registering your finger when on charge, then try again when charging from your computer.
Me too experienced this. Are you on stock or custom rom?
I am on custom rom! Now in charmeleon i dont have any issue.
I'm experiencing this on my HOX as well. The unlock ring becomes nigh on impossible to drag to the center to unlock & get to the home screen. Completely stock & on 1.29.401.11
I also have this problem too, using stock unbranded phone on latest software. When plugged in with official charger its very difficult to unlock and slows screen response considerably.
Sent from my HTC One X using XDA
this has been mentioned before, i get this issue sometimes, some people say its charger, but it can't be, seeing as both my chargers do this, and my desire hd doesn't do that on either charger, so by process of elimination it must be the phone at fault, seeing as it only happens when on charge, and not always on charge, i suspect a software bug somewhere
report it to htc though, then we might get a fix sometime.. i already have btw
Does it do the same when charging via your USB port on your pc?
Sent from my HTC One X using Tapatalk 2
lawrence750 said:
this has been mentioned before, i get this issue sometimes, some people say its charger, but it can't be, seeing as both my chargers do this, and my desire hd doesn't do that on either charger, so by process of elimination it must be the phone at fault, seeing as it only happens when on charge, and not always on charge, i suspect a software bug somewhere
report it to htc though, then we might get a fix sometime.. i already have btw
Click to expand...
Click to collapse
I wouldn't necessarily say that. My friend has a charger that messes up my Infuse's touch screen, but it has no issue on his phone. Certain phones can act weird with certain chargers. I've never really understood exactly what the issue is, but the HOX seems to be pretty picky. What worries me is the fact that it seems like there are a number of people with issues with the stock charger. It makes me wonder if the issue is a build issue with the phone, perhaps in the connector, that's making it picky or causing the problem all together. We should probably start gathering information about phones that have trouble with certain chargers and what version of the phone they are and see if there is a common trend.
Me 2,updated to 1.29.can't pull up to top,when I want remove the shortcut app from main page.
Sent from my HTC One X using XDA
Sometimes after i do manage to unlock the screen while on charge, the phone will immediately open the 'Phone' app. I thought it may just be because I dragged the ring too close to the 'phone' quick launch icon but definitely not the case.
Has anyone else experienced anything like this?
Yes I have noticed this to!
Sent from my HTC One X using xda premium
I had this too from day one and thought I had a faulty handset. I noticed somebody mention the charger and at the time I was using my (not too old) Sensation XE charger. I switched to the charger supplied with my HOX and haven't had the problem since. Still seems strange why this occurred because using the cable from the Sensation to connect to my PC it was never unresponsive, only when it was plugged into the wall socket.
Sent from my HTC One X using xda premium
liberator72 said:
I had this too from day one and thought I had a faulty handset. I noticed somebody mention the charger and at the time I was using my (not too old) Sensation XE charger. I switched to the charger supplied with my HOX and haven't had the problem since. Still seems strange why this occurred because using the cable from the Sensation to connect to my PC it was never unresponsive, only when it was plugged into the wall socket.
Sent from my HTC One X using xda premium
Click to expand...
Click to collapse
The reason you don't see the problem when connected to your pc is because most computers have good quality,regulated supplies to provide the 5V on their USB ports. The reason some wall chargers, even the official One X type in cases, are affected is because they are switch mode power supplies which convert 110/230V AC to 5V DC using high frequency pulses, if those aren't filtered properly they interfere with the touch screen. That's why I suggested testing by charging over USB earlier.
Sent from my HTC One X using Tapatalk 2
Yes, I've noticed it too.
But I have in my past phones too, don't all phones do this?
Sent from my HTC One X using Tapatalk 2
After nearly 2 and a half years with my desire (bravo) I have never had any sort of screen problems, it's weird!
Sent from my HTC One X using XDA App
Super Saiyan said:
Sometimes after i do manage to unlock the screen while on charge, the phone will immediately open the 'Phone' app. I thought it may just be because I dragged the ring too close to the 'phone' quick launch icon but definitely not the case.
Has anyone else experienced anything like this?
Click to expand...
Click to collapse
Same thing happen to me.... any solution for that?
ha, looks like I am not the only one with this issue... it happened to both the HTC original charger and another 2 units of usb+3pin charger as well...
Anyone got solution?
shuflie said:
The reason you don't see the problem when connected to your pc is because most computers have good quality,regulated supplies to provide the 5V on their USB ports. The reason some wall chargers, even the official One X type in cases, are affected is because they are switch mode power supplies which convert 110/230V AC to 5V DC using high frequency pulses, if those aren't filtered properly they interfere with the touch screen. That's why I suggested testing by charging over USB earlier.
Sent from my HTC One X using Tapatalk 2
Click to expand...
Click to collapse
brilliant point, it so happens that im currently living in an old house, with a crappy power supply, even my speakers were affected before. i don't have this problem whilst charging the phone at work (albeit with a different charger)
I think ill try plugging into different power ports around the house etc and experiment a bit... never thought it could be the house, although again the dhd isn't affected, so something must still be missing/not right on the one x for it to display this symptom.

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