Develop Bugs

Problems with touch screen when screen is locked and phone is charging...

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
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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?
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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

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
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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
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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

Nexus thinks it's always charging?????

I have had my v-gnex for a few months now and all of a sudden the micro USB port seems to be having issues. It doesn't light up when plugged in and the phone, no matter what from I use. Its always charging. USB be in or out. Any one else having this issue? Tried many different types of chargers.
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Alex8404 said:
I have had my v-gnex for a few months now and all of a sudden the micro USB port seems to be having issues. It doesn't light up when plugged in and the phone, no matter what from I use. Its always charging. USB be in or out. Any one else having this issue? Tried many different types of chargers.
Sent from my Galaxy Nexus using xda premium
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Try backing it up and then factory wipe the phone. If it's still present more than likely the USB bits has died on you or is dying.

For what it's worth, I had a similar issue with a completely different device which had USB charging.
USB port was basically dying, as evidenced when I pulled it apart.

I did research on it cuz it happened to me.
When using a non-samsung usb plug, you have a high chance of bending the tounge of the USB port down.
Its touching the metal casing surrounding it. Take a toothpick or a pocket knife and make sure its in the middle. Also clean it out of any debris.
Fixed it for me.

Some have had luck with trying to bend the USB pins a little, but don't try that without reading up on the issue. And a lot of people have needed a USB board replacements.
If you still have a valid warranty on your device i'd go for a claim on that.
Do a search in these forum's, there should be MANY threads about the same problem.

http://forum.xda-developers.com/search.php?searchid=39192424
good day.

Alex8404 said:
I have had my v-gnex for a few months now and all of a sudden the micro USB port seems to be having issues. It doesn't light up when plugged in and the phone, no matter what from I use. Its always charging. USB be in or out. Any one else having this issue? Tried many different types of chargers.
Sent from my Galaxy Nexus using xda premium
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Click to collapse
I have quite the opposite! mine seems to think it's NEVER charging. Samsung stock charger Samsung ns4g charger..the only one that i eventually get working is an lg one and not usb
Sent from my Galaxy Nexus using xda app-developers app

Alex8404 said:
I have had my v-gnex for a few months now and all of a sudden the micro USB port seems to be having issues. It doesn't light up when plugged in and the phone, no matter what from I use. Its always charging. USB be in or out. Any one else having this issue? Tried many different types of chargers.
Sent from my Galaxy Nexus using xda premium
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Click to collapse
My galaxy nexus went in for repair about 2 weeks ago to intercity in birmingham for exactly this problem, under samsung warranty got a text from them earlier tonight saying if i want my phone fixed that will be £51+vat! I went to the samsung site and found that my service request status had changed to cancelled.. is this normal?!
intercity could give me no further info when i called them so i have had to contact samsung but if i dont pay the charge my phone is going to be returned to me unrepaired in 48hours. is it normal or is it the repair place trying to pull a fast one. My nexus is only 6 months old..

Same thing happened to me since yesterday. Hope I can fix it without sending it for repairs.
Sent from my Galaxy Nexus using Tapatalk 2

nemo astrai said:
My galaxy nexus went in for repair about 2 weeks ago to intercity in birmingham for exactly this problem, under samsung warranty got a text from them earlier tonight saying if i want my phone fixed that will be £51+vat! I went to the samsung site and found that my service request status had changed to cancelled.. is this normal?!
intercity could give me no further info when i called them so i have had to contact samsung but if i dont pay the charge my phone is going to be returned to me unrepaired in 48hours. is it normal or is it the repair place trying to pull a fast one. My nexus is only 6 months old..
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Click to collapse
Bad form replying to my own post but Samsung have said that the reason my service request was changed to cancelled was because it had been determined it wasnt a manufacturing defect... great..

Battery/USB fix

Thanks to Simms22 for this easy fix...
Was having battery issues where my battery would be "charging" without being plugged in....right at 14% the stupid low battery screen popped up every 2 seconds. Tried everything software wise and couldn't fix it. I was confused. The USB prong seemed like it wasn't touching the housing but Simms22 clearly pointed out the obvious and said it could still be touching. Low and behold I tore my phone apart, cleaned the USB and stuck a razorblade under the prong, pryed it up ever so slightly and wouldn't you know, fixed (for now). Morel to the story, try this fix before anything else.
Sent from my Galaxy Nexus using xda premium

DarkJatrix said:
Thanks to Simms22 for this easy fix...
Was having battery issues where my battery would be "charging" without being plugged in....right at 14% the stupid low battery screen popped up every 2 seconds. Tried everything software wise and couldn't fix it. I was confused. The USB prong seemed like it wasn't touching the housing but Simms22 clearly pointed out the obvious and said it could still be touching. Low and behold I tore my phone apart, cleaned the USB and stuck a razorblade under the prong, pryed it up ever so slightly and wouldn't you know, fixed (for now). Morel to the story, try this fix before anything else.
Sent from my Galaxy Nexus using xda premium
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Click to collapse
I ended up breaking the usb connector trying to unstuck the little guy in the port. Luckly it's an easy part to replace even for me without any soldering experience so I ordered one from the internet for 10$ and replacing the whole usb board.

micheledm said:
I ended up breaking the usb connector trying to unstuck the little guy in the port. Luckly it's an easy part to replace even for me without any soldering experience so I ordered one from the internet for 10$ and replacing the whole usb board.
Click to expand...
Click to collapse
Dang. Lol. I was worried bout that. Glad that didn't happen.
Sent from my Galaxy Nexus using xda premium

[Q] Stuck charging? - Hardware, yeah?

I've already googled and found that it seems like this problem happens to galaxy nexus owners often so...
I noticed yesterday morning that my phone would think it was still charging despite being unplugged. Looking into the battery stats it could tell when it was or wasn't.
My suspicion is that my use of an old micro usb cable (plastic housing was kind of chipped off) led to it wiggling more than normal, and something got messed up within the micro usb port of my gnex.
It still charges fine. I went on to update to 4.2.1 (dirty flash I guess?); upon booting up it would flip back from charging and not charging for a little bit, then go back to charging.
I think I was able to get my phone to light up and say it was charging while off as well, so I'm pretty damn sure it's hardware...
My issue is that I'm still within a year of my warranty, but I've already rooted and unlocked, and am not 100% familiar with reverting and back anymore... I haven't tried contacting Samsung either.
I think I could live with it being stuck charging, as long as it still charged. It just seems like it has problems reading on whether or not it is or isn't, not being able to charge.
Should I try to seek a warranty fix? What's my best option at this point?
Thanks!

look in your usb port, make sure that none of the fingers are slightly bent touching each other. ive found thats the most common cause of the phone showing that its charging when its not.

simms22 said:
look in your usb port, make sure that none of the fingers are slightly bent touching each other. ive found thats the most common cause of the phone showing that its charging when its not.
Click to expand...
Click to collapse
I think something may be touching, but I've never looked before so I'm not sure if it wasn't like that to begin with. I'm going to try taking a picture of it tonight when I get off work, but I don't suppose you could explain to me what the fingers are? I tried googling briefly but didn't find anything.

IF you haven't fixed this, try a toothbrush with some rubbing alcohol on it. I had the same problem, and it solved my problem. I imaging some dirt was just shorting a connector.

I had this issue happen to me before. I decided to send it into Samsung for service. I thought it was hardware and I would be dome with it well it is now 3 months later and its doing the exact same thing again, so at this point I know it isn't software, ROM, kernel. I did all that troubleshooting the first time around.
Anybody else had this problem return after being repaired? Is it more than just the micro USB port? I am going to try the tooth brush thing when I get home though. I don't see any pins bent but I will look closer
Sent from my Galaxy Nexus using xda premium

So I got a toothbrush and alcohol and will be testing that out tonite. I also bought some canned air. Anybody else chime in on what to try? I really don't wanna send it in AGAIN
Sent from my Galaxy Nexus using xda premium

Just dip a qtip in the rubbing alcohol and dab it on the port or dip the toothbrush I'm the alcohol and then shake it out. You don't want to soak in the connector just enough to help remove any contaminants.
Sent from my Galaxy Nexus using xda app-developers app

Worked really good xD... At first didn't seem to work, but after charging it and disconnecting the charger the icon disappeared ... That was a couple days ago and so far so good.
Thanks a lot xD
Sent from my Galaxy Nexus using xda app-developers app