Develop Bugs

[Q] Touch Screen issues?

Hey guys. I'm not sure if this is because I have a screen protector on or what... But pretty often I'll have issues with my touch screen where it either doesn't respond, or it jumps to a place my thumb isn't really near. Swype will go to an extra letter or two and the touchscreen keyboards sometimes input 3 of the same letter or nearby letters to the one I pushed.
I'm sorry if I couldn't articulate the problem well enough. But what should I do?

gmap516 said:
Hey guys. I'm not sure if this is because I have a screen protector on or what... But pretty often I'll have issues with my touch screen where it either doesn't respond, or it jumps to a place my thumb isn't really near. Swype will go to an extra letter or two and the touchscreen keyboards sometimes input 3 of the same letter or nearby letters to the one I pushed.
I'm sorry if I couldn't articulate the problem well enough. But what should I do?
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to me screen protectors are a waste of money and un needed. This could be your problem. I have never had an issue with screen nor has my wife and we have never used a screen protector. Try it without!

So I took the screen protectter off and its still having the same issue
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Though... I noticed it seems to happen when I'm either USB tethering or wireless tethering on Cm7 gb6. Gonna update to nightly 8 and see if I can reproduce the problem.
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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?
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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.
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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.
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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.
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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?
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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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There is another thread here somewhere that talks about the issues while being plugged in. I think this was one that was mentioned.
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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
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I can confirm this very issue on two GSII's I've used. It's annoying.
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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.
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Big thanks to everyone who responded to this thread, hopefully we can figure out what the problem is in the near future
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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.
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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.
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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.
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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

Touch.Screen unresponsive while charged?

What's this about? Is there a fix for this? evertime I plug my epic into the charger the touch screen acts weird..pressing random buttons and not responding to touches. Tried flashing multiple roms and it happens on all of em...any help would me greatly appreciated.
Currently using Thunder Hawk 3.1
Stank you smelly much!
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There is probably a short in your usb cable. It can cause erratic behavior in our screens, unresponsive or it just reacting whichever way it wants to. It'd be best to look into another cable, it seems to be the only constant thing in all cases you've experienced it.
Sent from my Epic 4G

I made this same exact thread but no one would answer meeee I'm having the same exact problem
Imthinking it might be from the charger/usb tho.. cuz I have 3 and 2 of them give me this problem and 1 works perfectly so I think it is the cable too
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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
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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.
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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.
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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.
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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.
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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.
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