Develop Bugs

[Q] Touch Screen goes crazy when plugged in

When my Mytouch 3g Slide is plugged in the touch screen goes crazy. It isn't accurate and starts clicking everything. Could it be my charger? 5.2DC - 500mA

shefsalad7 said:
When my Mytouch 3g Slide is plugged in the touch screen goes crazy. It isn't accurate and starts clicking everything. Could it be my charger? 5.2DC - 500mA
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I'm guessing that it is because of something along the lines of the electricity from the charger shorting to the touch screen, and since the touch screen works by using the electrical signals in your fingers, the electricity is screwing with the digitizer. I doubt its a charger issue, probably something within the phone. You could try using another charger. Does it happen when you plug your USB cable in?
Sent from my T-Mobile myTouch 3G Slide using XDA App

MusicMan374 said:
I'm guessing that it is because of something along the lines of the electricity from the charger shorting to the touch screen, and since the touch screen works by using the electrical signals in your fingers, the electricity is screwing with the digitizer. I doubt its a charger issue, probably something within the phone. You could try using another charger. Does it happen when you plug your USB cable in?
Sent from my T-Mobile myTouch 3G Slide using XDA App
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It seems to be fine when plugged into the computer via usb. Thanks for the quick reply.

MusicMan374 said:
since the touch screen works by using the electrical signals in your fingers, the electricity is screwing with the digitizer. I doubt its a charger issue, probably something within the phone.
Sent from my T-Mobile myTouch 3G Slide using XDA App
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Really? Anyone that does any troubleshooting knows that if problem is unknown that one must start eliminating possible problems.
@shefsalad: If the phone is fully functional before plugging it in, then the charger must be the issue. Now since the charger is two piece, it must be the cord or the charging unit. You had it right with asking to plug it into a computer. If it works fine plugged into a computer, the cable is fine and its the charging unit. If you'd like to further put suspicions to rest, see if you can borrow another persons charging unit or see if tmobile can lend you one for a minute.
Sent from my T-Mobile myTouch 3G Slide using XDA App

shefsalad7 said:
It seems to be fine when plugged into the computer via usb. Thanks for the quick reply.
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Then there's a good chance it's the charging unit, like the other guy said, try to get another one, maybe a warranty replacement from tmobile. It would also be good to try a different unit as well as a different cable entirely, as the problem could still be with the usb cable. We want to narrow it down as much as possible.
@guitarist5122, no need to be so hostile, I was simply projecting a theory. Somehow, electricity is flowing over to the digitizer with the phone plugged into ac power. This is why I asked him if it happened with just the usb cable plugged into his computer. If it didn't, then its possible that either the charging unit is defective, giving the device too much electricity, which is resulting in it discharging in the digitizer or elsewhere, or it could also be that the wiring within the phone is slightly messed up, so that the small voltage of usb doesn't affect it, but full AC power overloads it. Now all he needs to do is try using a different AC unit to determine the problem. However, the problem could still lie in the usb cable, the problem could just not be emerging until full AC power is fed through it, so it would be ideal for him to try an entirely different charger, with a different unit and a different usb cable. This would eliminate all possible problems. So, I think my troubleshooting skills are just fine, thanks.
Sent from my T-Mobile myTouch 3G Slide using XDA App

No hostility. Just pointing out that i see advice coming from little knowledge disguised as solid advice. Nothing wrong with advising people with what knowledge we do have, but mention that the advice is based on little knowledge and may be inaccurate.
I must point out the flawed advice. It simply cant be the cable since the cable just transfers electricity. In this instance, it could only be the cable if it had a bad connector (the standard A or micro B) like maybe a bad ground. If that was the case the problem would carry over to the pc.
Also, it has nothing to do with AC simply because the phone does not recieve AC, but rather DC. The charger converts AC to DC. DC is the same current coming from the laptop as well. If i actually think about it, i dont know a charger that supplys AC to a device (especially a chargable one).

I experienced this when I tried to plug my Motorola Milestone into my Dad's Blackberry 9700 charger. It charges just fine, but the screen goes wacky when I touch it. Other chargers such as the one from Motorola, or my Nexus One charger, did not have this problem. So it appeared to be some sort of odd grounding issue.

I also have this issue happening, but only with the cheap aftermarket charger. It also does it to my girl's motorola Cliq. It's simply the charger, get a new one if it bugs you, or unplug it when you want to use it.

Thanks to everyone for your input and advice. I was worried that this might cause my phone to explode or something.
Sent from my T-Mobile myTouch 3G Slide using XDA App

Have the same problem with Desire HD
I'm using HTC charger and cable, it also happened when connecting to pc so I'm suspecting the cable.
I'll try a different charger and cable then I'll try the original charger with the new cable. The problem is that this issue is happening sporadically so it will be difficult to test.

Definitely the charger despite being the one that came with the phone

same problem.
I bought a local manufactured phone. And when i plugged in as for the first charge it went crazy when trying to use the phone. But it does even when USB is plugged in and not switched on.v but works fine when cable not plugged in. And when i tried my brothers Samsung Galaxy Nexus charger it worked like a charm with no problem. It's just matter of hours(2/3hrs) after i bought it.

Evo charging lag?

This isn't a problem but more of just a general question. So does anyone else experience your phone kinda lagging or having screen sensitivity issues (have to press hard on screen to scroll) while having the phone charge? This is like a 50/50 thing sometimes it does this sometimes not. So post your experiences with this
Sent from my PC36100 using XDA Premium App

Yes indeed. In my case, it's caused by my HTC USB cable that came with the phone. When I use the charger from my old LG ENV3, i never get that problem at all. As soon as I switch to the HTC cable, it's nearly un-usable whilst plugged in. It's odd, because the HTC cable works fine for charging and transferring data, so I don't know, but there's something wonky with it.

Hmm interesting
Sent from my PC36100 using XDA Premium App

I've always wondered if I was the only one...

joehunni said:
I've always wondered if I was the only one...
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Nope, you're not. It can certainly become rather annoying if you're trying to use your phone while it's charging.

Yea, using swype is IMPOSSIBLE when plugged in.

I never used to have this problem before, so I wonder if this is something that comes with age of the phone. I've run all kinds of roms/kernels and never had this issue until maybe a month ago. But I think I've successfully narrowed it down.
You need a charger that outputs 5v at 1000mA. Any more or less and you'll get the wonky response. I have an 800mA and a 1.5A charger at 5v and I get the laggy response. And I took it a step further and noticed that I get maximum charging speed (regardless of kernel, I've tried stock and custom/SBC kernels) with a 28/24 AWG or 24/24 AWG micro USB cable. If you still rock the stock HTC charger/cable combo you should be golden.

adamantypants said:
I never used to have this problem before, so I wonder if this is something that comes with age of the phone. I've run all kinds of roms/kernels and never had this issue until maybe a month ago. But I think I've successfully narrowed it down.
You need a charger that outputs 5v at 1000mA. Any more or less and you'll get the wonky response. I have an 800mA and a 1.5A charger at 5v and I get the laggy response. And I took it a step further and noticed that I get maximum charging speed (regardless of kernel, I've tried stock and custom/SBC kernels) with a 28/24 AWG or 24/24 AWG micro USB cable. If you still rock the stock HTC charger/cable combo you should be golden.
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i don't think its from age of the phone because i just got my phone in december (hw 0004) and i am still using the stock htc charger/cable. so idk its a mystery. nice work finding all that out tho its good to know that i am not the only person who experiences this haha.

I only get the problem when I'm plugged into A/C power, but not when I'm plugged into the D/C car charger... I think it has something to do with how the outlet is grounded. Maybe the touchscreen gets confused by getting grounded through the charging port rather than through your body. I'm basically making this up based on hazy memories from an E&M class I took about 8 years ago, but I think it's close. Anybody with any actual knowledge care to correct me?

[Q] Charger messing with touch calibration

So I have this charger for work : http://www.amazon.com/gp/product/B001LRPN0S/ref=oh_o04_s00_i00_details
And when I have the phone plugged in and I try to use the touch screen, it doesn't register my touch correctly. Sometimes it thinks I'm tapping an inch higher, or left/right of where I was actually tapping.
When I unplug the phone it works great, nor does this happen at home with a different charger.
Is there a specific reason this happens/is anyone else having this problem?
EDIT: Mods, please move to the Q&A. Thanks!

wolfman87 said:
So I have this charger for work : http://www.amazon.com/gp/product/B001LRPN0S/ref=oh_o04_s00_i00_details
And when I have the phone plugged in and I try to use the touch screen, it doesn't register my touch correctly. Sometimes it thinks I'm tapping an inch higher, or left/right of where I was actually tapping.
When I unplug the phone it works great, nor does this happen at home with a different charger.
Is there a specific reason this happens/is anyone else having this problem?
EDIT: Mods, please move to the Q&A. Thanks!
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Click to collapse
It could mean that the charger is not supported by the phone. Yes, I know it sounds ridiculous and/or stupid. But I had the same problem with a 1A charger from Nokia on my Nexus S (I checked 3 different chargers in shop and all were making the phone act like it was drunk, lol). Changed the charger to a 1A HTC one and it worked. So dunno, change the charger and see if it helps.

Yep this apparently happens to quite a few smartphones on aftermarket chargers. I saw several similar reports on the desire board when I was on that phone, but never had it myself on any of my phones.

I had the same issue with my atrix with a generic charger from best buy. I don't have the same issue with my nexus but I've definitely seen it before.
Sent from my Full AOSP on Maguro using Tapatalk

Yep, have that same problem from third party chargers.

my generic charger does the same thing. i was getting very mad that my screen was acting up. glad this is not a big issue. guess ill use the original charger. also, has anyone noticed that the screen goes crazy if you have to many finger prints on it? i have to clean my screen to make it work....

On the manual that comes with the GSM Galaxy Nexus Samsung says:
"While the device is charging, the touch screen may not function due to an unstable power supply. If this happens, unplug the travel adapter from the device."
I guess that means your charging is feeding the phone an unstable current.
I would not use such a thing and will stick to Samsung's charger.

This happens to me on my Incredible, but may have to do with 500 vs. 1000 amps... Not sure...

lambda30 said:
It could mean that the charger is not supported by the phone. Yes, I know it sounds ridiculous and/or stupid. But I had the same problem with a 1A charger from Nokia on my Nexus S (I checked 3 different chargers in shop and all were making the phone act like it was drunk, lol). Changed the charger to a 1A HTC one and it worked. So dunno, change the charger and see if it helps.
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Same thing happened to me with a Nokia charger on my Nexus S.

Burned/Melted USB Cable.

So I saw the disclaimer for the HTC Hero, however this is a completely different device / manufacturer (Besides, it's Google ).
I was charging my phone over night, like I usually do. However, when I woke up, I noticed that the phone wasn't charging and sitting at around 70%. So in the dark, I was plugging and unplugging the cable (You know, the fun things you do when you first wake up). After about 3 tries and seeing the device not even registering to being charging (Using the 'high pitch squealer' black charger cube that came with it), I turned the lights on. Noticed burn marks around the connector that goes into my Phone. Pulled the Cube out and that was the end of that.
Later in the day (when I came home from class), I contacted my Carrier (Rogers) and told them. They apologized for the inconvenience (a melted cable on a potentially flammable surface is an inconvenience >.>). They basically told me to go back to Cellcom and replace the unit. After this, I contacted Samsung, who actually, to my surprise, simply didn't care. The now damaged unit now shows up as USB 1.0, but this depends on the angle of the other USB cable.
The "tl;dr" is:
- Burn marks around USB connection to my Phone.
- Cable no longer functions. See the cable as to why, the one (and potential 2nd) ground pin has melted bits surrounding it them.
- Damaged Unit
- Samsung told me basically it's not their problem.
Pictures of the Cable. I can't really get inside my unit without voiding the warranty so there are no pictures of that.
hxxp://i.imgur.com/9kcEe.jpg
hxxp://i.imgur.com/8jubQ.jpg
Apologies about the picture quality, I took them with my Galaxy Nexus.
Anyone else have a similar experience/issue with this?
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Wow that sucks, I would expect the odds of that happening are pretty slim. I am surprised that samsung didnt care. I'd like to hear their reasoning behind it not being their problem. I am even MORE surprised that Rogers did care since they can very easily say that since they didnt make the phone that it isnt their problem to deal with and to contact samsung.

Wow , that sucks dude. I haven't seen that happen to a galaxy nexus yet. (It happened to me with my nook tablet, but that's a different story lol). The actual micro USB slot in the phone isn't burnt is it? If it is , you may want to just invest in an extra battery and external wall charger if you can't charge with another micro USB .( thats what I do, I haven't actually charged my nexus via USB since I got it). But if I were you , I would absolutely raise some hell with the carrier you bought it from until they give you a new one. I cant see how this could be your fault .
Sent from my Galaxy Nexus using XDA App

I have charged mine on the one provided, a different samsung charger, car charger from my Droid X dock, BB cable, and blackberry charger. Never had a problem. Sorry to hear that.

Holy crap. I had the charging problem that is a "known bug" until I realized that the cable that came with my phone was defective. I have half a dozen other Samsung cables around so it was no big deal to swap the useless cable and throw it away. But the thought of a defective cable causing a fire hazard situation is worrying.
Sent from my Galaxy Nexus using XDA App

yes
In answer to your question: I found this thread by searching for an explanation after my port and cable just now burned up while I was using the phone. Started to smell something funny, and then heard a crackling noise from the phone while seeking the source of the odor. I can only imagine what might have happened if I had been asleep in the other room rather than holding it in my hand when it happened! Not cool, Samsung.
The specifics: I was using the cable that came with the phone and the stock battery, but plugged into a multi-port USB charger. The information here helps my confidence that the problem wasn't my charger, thank God. I say that I can only imagine what might have happened because the loud crackling and intensifying burning smell gave me the distinct impression that it would have burst into flames if allowed to progress much further in the process. Also, the first symptom was failing to show it was connected to the charger, and one of the things I tried was unplugging it and plugging it back in (to a different port of my charger.) The charger doesn't seem to be malfunctioning or damaged, but the cable and port are similarly scorched. The phone made the same crackling noise immediately when connected to a different USB cable and stock charger (for a split second.) And other than that my phone is still working, now on the extended battery that was charged on an external charger; it's what I'm typing this with.

p1ague said:
In answer to your question: I found this thread by searching for an explanation after my port and cable just now burned up while I was using the phone. Started to smell something funny, and then heard a crackling noise from the phone while seeking the source of the odor. I can only imagine what might have happened if I had been asleep in the other room rather than holding it in my hand when it happened! Not cool, Samsung.
The specifics: I was using the cable that came with the phone and the stock battery, but plugged into a multi-port USB charger. The information here helps my confidence that the problem wasn't my charger, thank God. I say that I can only imagine what might have happened because the loud crackling and intensifying burning smell gave me the distinct impression that it would have burst into flames if allowed to progress much further in the process. Also, the first symptom was failing to show it was connected to the charger, and one of the things I tried was unplugging it and plugging it back in (to a different port of my charger.) The charger doesn't seem to be malfunctioning or damaged, but the cable and port are similarly scorched. The phone made the same crackling noise immediately when connected to a different USB cable and stock charger (for a split second.) And other than that my phone is still working, now on the extended battery that was charged on an external charger; it's what I'm typing this with.
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Holy ****! That must of been a scary sight, and especially waking up to a smell of that. I am glad now that I have the landscape dock that I use for my charging purposes. I think now I will be extra cautious to plug in a usb cable into my phone and if I need to transfer any files I will either be using bluetooth (for the small files) or using ftp file transferring over wifi.
If I were in your shoes I would be calling Samsung to tell them about it and to see if they can take a look at it to see what was causing it and perhaps replace it.

I'm not entirely surprised by their lack of concern. My efs on my Nexus S corrupted on the stock 2.3.4 OTA. They not only would not fix my device but claimed it had corrosion on the circuit Printed Board Assembly and that was the issue and voided my warranty.
I've had the PBA inspected by a buddy of mine who all he does for a living is repair electronics, and the PBA has zero corrosion on it. My IMEI still comes and goes as it pleases on my Nexus S still to this day. Sometimes it returns after a few reboots with no SIM in sometimes its over a month and everything in between.
The point being is that when you own a phone they don't really care but when my TV broke they cared and fixed it immediately and sent someone to my house.
Good luck man I'd call and raise hell if you can't get a reasonable person to help you. The Galaxy Nexus hotline from the Play Store also deals with Galaxy Nexus devices not purchased from them I believe, at least there's an option for people who didn't buy them from Google in the menu when you call. (855)-83-NEXUS
Sent from my Galaxy Nexus using xda premium

Why did you apologize about the picture quality? They look fine.

Same thing here. Phone just stopped charging. I pulled the USB cable because I smelled burning/fire/smoke.
I looked at the USB plug and it was charred on the inside, as was the phone. Just... wow.

burned micro usb cable
so literally a few minutes ago i plugged in my charger into the wall and smoke came out of the microusb side and then from smoking went to burning, i just wanted to know if anyone else has had this problem and to warn you guys so that you dont plug it in and it burns your phone

Look for my other thread about the Galaxy Nexus.
Sent from my Galaxy Nexus using Tapatalk 2

This happened to me yesterday. Samsung does not care. Google does not care. Samsung wants me to send in the phone, no replacement, said the repair would start at $70. Seems unlikely I will be buying another Samsung device. Tempted to avoid all future Nexus devices too.

[Q] High-pitched whining noise while plugged into charger

I have a rooted stock 4.4.2 Nexus 7, and I'm encountering a really weird problem where there's a persistent high-pitched whining noise that seems to come out of the speakers whenever it's plugged into a wall charger. I tried the stock charger + cable that came with my device as well as 2 other third-party chargers all with the same results. Meanwhile, charging it via USB connected to my computer doesn't produce that sound at all.
Does anyone know if there are any tweaks or settings that could be causing this? I looked in the FAQ, and I only see a giant thread about static while at low volumes, but this looks to be a completely separate problem since it's unrelated to volume settings & it happens when I have no sound playing at all. Googling this returns a bunch of results with people's chargers making noises, but not the Nexus 7 itself.
If anyone else has had this problem and can offer any insight, that'd be appreciated. It's not the biggest deal in the world, since I just have to make sure I'm not in the same room when it's charging so I don't get annoyed, but if I can fix it, that'd be great.

tarotsujimoto said:
If anyone else has had this problem and can offer any insight, that'd be appreciated. It's not the biggest deal in the world, since I just have to make sure I'm not in the same room when it's charging so I don't get annoyed, but if I can fix it, that'd be great.
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Maybe a ground loop. Can you ground your tablet and see if that helps. Just a theory at the moment.
Sent from my Nexus 7 Flo running CM 11 4.4.2 with ElementalX Kernel using XDA Premium 4 mobile app

LinearEquation said:
Maybe a ground loop. Can you ground your tablet and see if that helps. Just a theory at the moment.
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Sorry for the dumb question, but to ground it, just have it touching metal?
Also, a new piece of information: I found that the noise only happens when the tablet is fully charged (100%) and still plugged in, so it happened last night while I left it in to charge after going out. I'll have to wait for it to fully charge again before I can test this theory today.

tarotsujimoto said:
Sorry for the dumb question, but to ground it, just have it touching metal?
Also, a new piece of information: I found that the noise only happens when the tablet is fully charged (100%) and still plugged in, so it happened last night while I left it in to charge after going out. I'll have to wait for it to fully charge again before I can test this theory today.
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Not an extra ground, isolate the ground. Make sure the tablet and charging brick are grounded well. Is your outlet/house grounded well? Can you use an outlet with nothing else plugged into that line?
You say this only happens when fully charged and not until? I wonder if there is a problem with the battery perhaps over charging. Have you switch charging bricks? Switched cords? Does the charging brick get warm? How about the back of the tablet?
Edit: Are you using the official cord and charging brick? That can make a difference. If not what are the specks of the brick you are using?
Sent from my Nexus 7 Flo running CM 11 4.4.2 with ElementalX Kernel using XDA Premium 4 mobile app

LinearEquation said:
Not an extra ground, isolate the ground. Make sure the tablet and charging brick are grounded well. Is your outlet/house grounded well? Can you use an outlet with nothing else plugged into that line?
You say this only happens when fully charged and not until? I wonder if there is a problem with the battery perhaps over charging. Have you switch charging bricks? Switched cords? Does the charging brick get warm? How about the back of the tablet?
Edit: Are you using the official cord and charging brick? That can make a difference. If not what are the specks of the brick you are using?
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Click to collapse
Another new piece of information discovered today: The high-pitched whine only happens when the battery is 100% AND when the screen is on. When the screen is off, everything is fine.
So far I have tried:
1. Directly plugging into the outlet the stock Nexus 7 charging brick & cord.
2. Using the following bricks: Stock charger, Anker 40W 5-port USB charger, Amazon Kindle charger, Moto G stock charger. I've also tried all the cables that came with these devices as well as any other microUSB cables I've got lying around the house.
3. My device is not hot at all, and neither are the chargers.
Thanks a lot for your help so far! Looks like what I need to do is to turn the screen off to charge my device, and then unplug it when I want to turn the screen on & use it.