[Q] Static when plugged into AUX port. - HTC One X

So after seeing how disappointing the iPhone 5 is I upgraded to the One X. Im having issues when I have my phone plugged into my Aux port in my truck. Certain notes mainly snare beats and higher notes, there is some static and popping noises. I tried turning Beats off, different cable, but still nothing. Any thoughts?

I had a problem like that with an old phone. Turned out that my case was keeping the plug from going all the way in on the phone.
Check it out. Doesn't hurt to look.
Also try the phone it a pair of headphones to rule out the phone itself as the problem.
Sent from my HTC One X using xda premium

Static and other whining noises through the car audio when connected over AUX (and especially when the phone is charging) is a very common problem. There are many reasons, all of them are due to problems of your car and not the sound source (i.e Phone). It could be due to a poor ground, electromagnetic interference, noisy power input (to the phone charger) or a phenomena called ground loop. There are cheap ground loop isolators and noise filters (on Amazon and eBay) that you can use between the AUX port and Audio output of your phone to minimize these noises.
EDIT : More info on this thread.

I feel that it might be a combination of both. I got a little static with my Inspire 4G in the car, but if I switch to my SGS3, the static is way more noticeable. I really dot know what the problem might be as I've looked into it. My first thought was the 4G signal interference but I have yet to back up that claim.
Sent from my SAMSUNG-SGH-I747 using XDA Premium App

Purchase a new AUX port, can be easily installed in most vehicles. Though it could be a bit expensive.

Related

[Q] Desktop Dock Line Out Electrical Noise/Static

After the release of Froyo I picked up the desktop dock. However, I found that when both line out audio and the micro usb charger are connect to the back of the dock, electrical noise/static comes out from the speakers (connected to line out).
I have replicated this with two different micro usb chargers. The wall charger that came with the dock and a car usb charger. The audio is perfect when only the line out is connect to the dock. But, as soon as a charger cable is connected static/noise immediately starts up.
Has anyone here both charged and used line out audio without any issues? Suggesting that I may have a defective unit, terrible power, unshielded audio cable, etc.
Thanks for any insight you might have on this issue.
Have you tried connect to a different setup of speakers or use a different audio cable? It sounds like you are having a problem with poor shielding on the audio cable connected to the back of the desktop dock.
I have the same problem, and I'm using the ear buds at work. I'm highly disapointed with the quality of audio coming from this device. I waited all this time and I get static!
same static with my dock
try samsung support.
their products, their problem...
its obviously a hardware design flaw, where the internal wiring/ components are picking up interferance, from itself or the phone.
WARNING SIGHTLY EDUCATIONAL: i dont have a dock but i cant set my phone within 1.5 feet of my alarm otherwize the alarm will "chirp" every few minutes. This is due to the alarm having a transistor radio and capasitors inside, the radio picks up the waves from the phone, and that energy builds up in the capasitors until it reaches max capasity then discharges to the speaker, chirpping.
chances are that they built the guts of the dock too small and compact, probably running the 3.7V power wires right along the auido wires which use less than a Volt, millivolts actually, and all wires with flowing electricity create magnetic feilds, the power wire would have a much stronger feild than the audio wire and could interfere with it, because inversly, magnetic feilds can create electricity in other wires (known as induction).
or it could be a culmination of the two factors.
back to topic, If it is the phone causing interference with the dock, it should have been built to be sheilded, if its the internal components of the dock it should have been designed different, EITHER way it would be samsungs fault or cheap overseas labour. I would gladly pay an extra (5-10%) on an item if it were made in North America (Can/US). Not mexico they take enough of our manufacturing jobs down there and might as well be overseas labour for quality and price.
if you dont care about the warranty pop it open and take some pictures for us, might be able to see/ possibly fix the problem.
At the time I tried with two different auxilery input cables, one well shielded for car audio and the other for a logitech speaker set; they both produced static. However, after restarting the phone it has yet to produce static. This phone and it's accessories are temperamental.
Ground loop
You have a ground loop, You need one of these.
http://www.crutchfield.com/p_127SNI...e-Filter.html?tp=2653&tab=review&rvm=ShowAllt
that is actually EXACTLY whats needed to filter out the interferance! nice i never saw a headphone one before...
Can anyone confirm that this device (noise filter) in the link solves the problem?
Anyone know of any other solutions, other than returning the dock? Shame because it is a great idea and is nice when it is working properly.
knaufism said:
same static with my dock
Click to expand...
Click to collapse
I just imported one of these docks, and the static on it really sucks, totally disapointed.
I haven't experienced static on mine due to the fact that I haven't gotten the headphone jack to even work in any capacity (media or calls). Has anyone had this problem at all?
I just picked up one and had the same issue. First few hours it worked great then all the sudden the volume went low and static started. 2 different power cords and 3 sets of headphones/audio cables later and still there.

Using for Media Player in Car = Buzzing Sound

I use the phone as my media player in the car. When I plugged it in to the AUX on the car stereo AND it is on the charger there is a buzzing and whining sound. This was almost an instant return. However it seems to be that it is only in that condition if the phone is not outputting any sound. Once I engaged GPS, or MP3s the buzzing sound goes away (not quite but actually gone). I need to test more for long pauses in between navigation prompts, but it seems to be ok as long as some app is planning to make a sound to the headphone port. Maybe a power saving feature?
I never had this with my EVO, my Wife's Epic 4G, or any other phone I have owned.
-
I experienced the same phenomenon on an LG g2x. Only would buzz when NOT playing sound.
EDIT: not in a car, this was on an A/C adaptor at home.
CrozB said:
I use the phone as my media player in the car. When I plugged it in to the AUX on the car stereo AND it is on the charger there is a buzzing and whining sound. This was almost an instant return. However it seems to be that it is only in that condition if the phone is not outputting any sound. Once I engaged GPS, or MP3s the buzzing sound goes away (not quite but actually gone). I need to test more for long pauses in between navigation prompts, but it seems to be ok as long as some app is planning to make a sound to the headphone port. Maybe a power saving feature?
I never had this with my EVO, my Wife's Epic 4G, or any other phone I have owned.
-
Click to expand...
Click to collapse
the noise you are hearing is from the alternator of your car.( the whinning) go in your car hook up your phone and charger and give it some gas, you will hear what i mean. there is nothing wrong with your car or phone, its actually something that is rather common, so dont worry. you can buy a '' 3.5mm ground loop isolator to hook up and it should take that sound away.
hope this helps
using it as a usb drive, is better than the aux input
the phone isnt grounded very well, and will cause some noise issues
and the headphone output really isnt that strong in comparison to the evo series, imo
I use Bluetooth for.media. Works great bumping that dub step
Sent from my SPH-D710 using xda premium
expertzero1 said:
I use Bluetooth for.media. Works great bumping that dub step
Sent from my SPH-D710 using xda premium
Click to expand...
Click to collapse
What receiver are you using? I tried the C3, but when it was fully charged fro some reason the sound goes to crap.
Here is a video of the noise. Note the car is NOT running. All the noise you hear comes from the stereo aux and phone. When I plug in my EVO, or the wife's Epic 4G there is NONE of this.
http://youtu.be/YoqdwVlpBAQ
It really freaks when panning and zooming.
I read this post this AM and decided to do my own testing. I used a Monster Cable 3, a generic Radio Shack cable, and something I found in a parking lot for the AUX, and 3 different car chargers and 2 different ones for the AC tests. I also tested with the music app, navigation, and no apps.
The results:
no apps - popping noises no matter what combination of cables or chargers I used
Music - popping noises when not playing music no matter what combination of cables or chargers I used
Navigation - popping noises when not navigation nowmatter what combination of cables or chargers I used
It seems that if you have something generating sound the popping sounds are gone (or at least mutted to the point where I didn't hear them). Otherwise, you get all sorts of odd noises as reported by other posters.
The car chargers were a BB charger, an iGo charger, and a Motorola charger and the test was repeated with both the engine running and just in AC mode (to keep the chargers active). The AC chargers were the out of box charger and my BB rapid charger.
I also repeated the tests with my wife's Evo and my old BlackBerry tour. Nether of those phones exhibited the same issue although both picked up some minor alternator whine when I was driving.
gksmith said:
I read this post this AM and decided to do my own testing....
Click to expand...
Click to collapse
I can't tell what truck you got splashing through the puddle in your profile, but I am driving (having this issue) in a Nissan Frontier. I too tried several cables and chargers always with the same result. I even ran power from my Motor Cycle and Audio to the Truck AUX and still had noise.
So then I tested this in my wife's car (Chrysler Sebring) and the noise is not there, gone nada. WTH?
I took advice from someone else on this thread and hooked up a Bluetooth receiver to the aux and that works fine.
My conclusion is it must be something between my Nissan Aux and this phone when connected directly.

Car dock

Well, I got the Samsung dock, and as much as I like the E4GT, the dock is terrible. Here's my experience:
1. There's a ton of line noise when the phone is docked but nothing is playing, just like with the Epic. I'm using the OEM charger, but that's not the problem--using the same charger, the Photon's car dock is absolutely silent. Samsung must be using some cheap electronics in this thing, and it's simply horrible. (Sorry for venting, but seriously...)
2. The software isn't nearly as seamless as the Photon's either. First, on the Photon, when you dock an app starts that essentially takes over the home button. That means you can move back and forth between the app and the home screens easily. On the Samsung, it seems like once you leave the Vlingo app to, say start a radio streaming app, you can't get back to the dock mode. At least, not without unplugging/replugging the dock connector, but that's extra wear and tear. If I'm wrong about this, please let me know.
Then, the Photon app allows for 4 custom apps to be assigned. That provides a great deal of flexibility, and again it's easy to go from one app to another and then back to dock mode.
Overall, the Samsung car dock experience is nowhere near the Photon's. Motorola really did a great job with this, and Samsung makes it look like they gave actually using the phone in the car zero thought.
What's everyone else doing to make this experience more usable? I'm still choosing between the Photon and the E4GT, and the car dock definitely is a mark in the Photon's favor.
1) Use bluetooth audio streaming for zero noise. Are you connected by the dock's audio out jack, or the GS2's headphone jack? I noticed better sound with the latter, but using BT is easier and sounds so much better.
2) Ditch Vlingo for CarHome Ultra. Extremely customizable and lots of great features, including up to 18 app shortcuts and auto-switching day/night themes. I love it.
You could make a profile in tasker that recognizes when the phone is plugged into a dock. Or you can make one for when it is rotated in landscape and plugged in. Then, you can enable an app to run, or have a list of apps that you can choose from. This is what I do with my phone and I don't even have a dock. It's awesome how much you can do with tasker!
fonseca898 said:
1) Use bluetooth audio streaming for zero noise. Are you connected by the dock's audio out jack, or the GS2's headphone jack? I noticed better sound with the latter, but using BT is easier and sounds so much better.
Click to expand...
Click to collapse
I'd love to do that, unfortunately my car doesn't have Bluetooth audio. And I'm going from the dock's audio out to my car's AUX in. That's an idea, using the headphone jack, but I hate adding wear and tear.
2) Ditch Vlingo for CarHome Ultra. Extremely customizable and lots of great features, including up to 18 app shortcuts and auto-switching day/night themes. I love it.
Click to expand...
Click to collapse
Great, I'll give that a try, thanks!
Sholland91 said:
You could make a profile in tasker that recognizes when the phone is plugged into a dock. Or you can make one for when it is rotated in landscape and plugged in. Then, you can enable an app to run, or have a list of apps that you can choose from. This is what I do with my phone and I don't even have a dock. It's awesome how much you can do with tasker!
Click to expand...
Click to collapse
That's another idea. Thanks!
fonseca898 said:
2) Ditch Vlingo for CarHome Ultra. Extremely customizable and lots of great features, including up to 18 app shortcuts and auto-switching day/night themes. I love it.
Click to expand...
Click to collapse
Thanks again for the tip, that app rocks. In fact, it's better than the Photon's car dock app.
Now all I need to do is find some way to clean up the line noise and I'll be a happy camper.
Go to radioshack. Ask them for a ferrite core. Should be a ring of "ferrite" or iron. Make sure it's big enough to put the plug on your audio cable through. Push it through and wrap it around a few times and see if that helps. Also, running a separate hot lead and ground from your car battery to the cigarette plug you use should help. But the ferrite core should be easier/cheaper
Sent from my SPH-D710 using XDA App
iamtheug said:
Go to radioshack. Ask them for a ferrite core. Should be a ring of "ferrite" or iron. Make sure it's big enough to put the plug on your audio cable through. Push it through and wrap it around a few times and see if that helps. Also, running a separate hot lead and ground from your car battery to the cigarette plug you use should help. But the ferrite core should be easier/cheaper
Sent from my SPH-D710 using XDA App
Click to expand...
Click to collapse
I'll give it a shot, thanks! I might even have one sitting around somewhere...
call audio routing
Has anyone else been able to get call audio to route to the output on the dock? media audio comes out the port so I can hear that on my cars speakers but when I make a call it comes out of the phone speaker....
So, I've tried a variety of power adapters, USB cables, and audio cables, and the line noise remains. I'm going to try the ferrite core around the audio cable, but I don't think that's the issue--if you unplug the unit from power, the line noise disappears. So, I think it's just bad circuitry in the dock.
One would think that Samsung would have received complaints about this with the Epic dock (at least) and would have fixed it. Motorola managed to make a dock with excellent sound quality and zero noise, so it's certainly possible.
Otherwise, the E4GT is decent in the car with that Carhome Ultra app. Although, that doesn't really help with my decision between the E4GT and Photon, because with the Photon I could have the same dock app but also outstanding audio quality.
I can only assume the noise you are hearing is due to a Ground Loop/Hum.
It has to do with the fact that your power source is grounded to a different point than the stereo/speakers. the hum you hear is the difference in voltage's between the 2 grounds being represented as noise in the line.
for instance. I recently installed a new head unit in my truck, the unit has an AUX in and a USB port. If i plug my E4GT aux cable into the stereo and plug the USB charger into the port on the stereo - NO Noise. However, if i plug the phone to charge in another outlet (say, the cig lighter) then there is Line Noise everytime. The same principle applies when plugging your phone audio jack into any electronics.
Hope this helps shed a little light on the noize.
ReFiLL said:
I can only assume the noise you are hearing is due to a Ground Loop/Hum.
It has to do with the fact that your power source is grounded to a different point than the stereo/speakers. the hum you hear is the difference in voltage's between the 2 grounds being represented as noise in the line.
for instance. I recently installed a new head unit in my truck, the unit has an AUX in and a USB port. If i plug my E4GT aux cable into the stereo and plug the USB charger into the port on the stereo - NO Noise. However, if i plug the phone to charge in another outlet (say, the cig lighter) then there is Line Noise everytime. The same principle applies when plugging your phone audio jack into any electronics.
Hope this helps shed a little light on the noize.
Click to expand...
Click to collapse
I hear you, except that I have two different docks that display entirely different behavior. Actually, I have two docks from the same manufacturer (Samsung, for the Epic and the Epic Touch) that have significant line noise, and one (Motorola) that does not. Note that these are all plugged into exactly the same power adapter and outlet and using the same USB and audio cables.
So, you'd need to account for the fact that the Motorola signal is perfectly clean in precisely the same circumstances while the Samsung's signal isn't.
I believe every word of it.
From what I know about Ground Loop Hum there are many weak links in the chain, and certainly some products behave better than others. The problem is still most likely the Ground.
One possibility would be that the manufacturer of the Moto Dock has included an isolator in the power supply line (or even in the audio supply line), and the manufacturer for the Sammys didnt.
My experience in this subject is with my Laptop/DJ setup making noise when plugged into audio equipment. when the power supply was plugged into the lappy, 60hz hum. Unplug it and it goes away. More than likely the problem was inside the computer or the power supply was just poorly manufactured as other models may not have the Hum. In my case i purchased a small isolater solved the problem. It may be possible to find one for a 12v car electrical system.
ReFiLL said:
I believe every word of it.
From what I know about Ground Loop Hum there are many weak links in the chain, and certainly some products behave better than others. The problem is still most likely the Ground.
One possibility would be that the manufacturer of the Moto Dock has included an isolator in the power supply line (or even in the audio supply line), and the manufacturer for the Sammys didnt.
My experience in this subject is with my Laptop/DJ setup making noise when plugged into audio equipment. when the power supply was plugged into the lappy, 60hz hum. Unplug it and it goes away. More than likely the problem was inside the computer or the power supply was just poorly manufactured as other models may not have the Hum. In my case i purchased a small isolater solved the problem. It may be possible to find one for a 12v car electrical system.
Click to expand...
Click to collapse
I actually hooked up an old RadioShack groundloop isolator to the AUX cable, and it got rid of the hum.
Something like this should work fine: http://www.amazon.com/GROUND-LOOP-I...QTRI/ref=sr_1_2?ie=UTF8&qid=1322958491&sr=8-2
ReFiLL said:
I believe every word of it.
From what I know about Ground Loop Hum there are many weak links in the chain, and certainly some products behave better than others. The problem is still most likely the Ground.
One possibility would be that the manufacturer of the Moto Dock has included an isolator in the power supply line (or even in the audio supply line), and the manufacturer for the Sammys didnt.
My experience in this subject is with my Laptop/DJ setup making noise when plugged into audio equipment. when the power supply was plugged into the lappy, 60hz hum. Unplug it and it goes away. More than likely the problem was inside the computer or the power supply was just poorly manufactured as other models may not have the Hum. In my case i purchased a small isolater solved the problem. It may be possible to find one for a 12v car electrical system.
Click to expand...
Click to collapse
Well, the salient point is that Samsung uses inferior components. It's possible to make a device that doesn't suffer from the problem, as Motorola has shown.
DevalB said:
I actually hooked up an old RadioShack groundloop isolator to the AUX cable, and it got rid of the hum.
Something like this should work fine: http://www.amazon.com/GROUND-LOOP-I...QTRI/ref=sr_1_2?ie=UTF8&qid=1322958491&sr=8-2
Click to expand...
Click to collapse
Thanks, I'll give that a try.
Sent from my SPH-D710 using Tapatalk
most times I've had line noise, be it from improper grounding or from cellular interference (namely from ground issues) the ferrite core fixed it. If it doesn't, the power isolation will. The reason the USB Ports on the head unit doesn't create line noiseis because it has isolation circuitry built in. The core is cheap. If that doesn't work, isolate power.
Sent from my SPH-D710 using XDA App
Okay, in the latest saga with the Samsung car dock, I noticed this morning that when I received a Bluetooth phone call, the TuneIn Radio audio I was playing didn't stop. Or, rather, it did stop once the stream buffer ran out, because I was on 3G and of course 3G data isn't available during calls.
Is this really how the Samsung dock works, that audio doesn't give way to Bluetooth calls? Or is that perhaps the CarHome Ultra app?
Still a bit frustrated with this aspect of the Epic Touch. The Photon's car dock works perfectly, including muting audio while on a Bluetooth call.
Grrr. I know, I know, if I like the Photon's car dock so much, why I don't I just stick with that phone... But seriously, Samsung, how hard is it to get this right?
wynand32 said:
Okay, in the latest saga with the Samsung car dock, I noticed this morning that when I received a Bluetooth phone call, the TuneIn Radio audio I was playing didn't stop. Or, rather, it did stop once the stream buffer ran out, because I was on 3G and of course 3G data isn't available during calls.
Is this really how the Samsung dock works, that audio doesn't give way to Bluetooth calls? Or is that perhaps the CarHome Ultra app?
Still a bit frustrated with this aspect of the Epic Touch. The Photon's car dock works perfectly, including muting audio while on a Bluetooth call.
Grrr. I know, I know, if I like the Photon's car dock so much, why I don't I just stick with that phone... But seriously, Samsung, how hard is it to get this right?
Click to expand...
Click to collapse
I wonder if it might be the phone or the application. When listening to Sirius/XM radio without a dock, and I get a phone call, the radio keeps blasting away.
You don't stick with that phone because this one is superior in every other way. Its a minor issue. Why would you even have the aux input selected when there is no music playing? I have the noise too so I get it but ...yeah I just change the input when I don't need it.
Sent from my SPH-D710 using XDA App

Anybody else's headphone jack noisy when car charger plugged in?

Hello all,
Has anybody had any trouble with noise/whine when using their Gnex headphone jack and charger at the same time. It is basically alternator noise as the pitch changes with the speed of the engine. Sucks that I can't use Pandora and charge the phone at the same time because of this.
Is it the phone or the charger that causes this?
falcaraz said:
Hello all,
Has anybody had any trouble with noise/whine when using their Gnex headphone jack and charger at the same time. It is basically alternator noise as the pitch changes with the speed of the engine. Sucks that I can't use Pandora and charge the phone at the same time because of this.
Is it the phone or the charger that causes this?
Click to expand...
Click to collapse
This is commonly referred as a "ground loop". There are several things you could try. What I would do is rewire your cigarette lighter so it shares a common ground with the head unit. You could also try another car charger, or putting a noise filter on the cigarette lighters +12v wire.
Sent from my Galaxy Nexus using xda premium
Rem3Dy said:
This is commonly referred as a "ground loop". There are several things you could try. What I would do is rewire your cigarette lighter so it shares a common ground with the head unit. You could also try another car charger, or putting a noise filter on the cigarette lighters +12v wire.
Sent from my Galaxy Nexus using xda premium
Click to expand...
Click to collapse
Spot on. This is especially the case if you're using an aux-in jack on your headunit. Also applies to the FM-transmitter folk too, though not all obviously.
An alternate fix is getting a ground loop isolater (http://www.amazon.com/GROUND-LOOP-ISOLATOR-3-5-APPLICATIONS/dp/B001EAQTRI like this). You can probably find a diagram online if you're handy with electronics (and want a side project) and get the parts at radioshack or something.
Happens to me when using bt streaming as well but only on certain stations. Also the whine starts out low and eventually the pitch goes so high I can no longer hear it.
Sent from my Galaxy Nexus using Tapatalk 2

static noise when plugged in car

when i plug my phone into my car to play music its fine. when i use my car charger and play music at the same time tis fine but the second the music stop i hear a static noise from my speakers (which is attached to my galaxy)
this static noise is an imitation of whatever my car is doing at that moment (if im reving the engine the static will resemble the revs, same with turn signals)
anyone else experiencing this problem?
It's feedback from the car electrical system. Usually a bad alternator ground or corroded battery cables, or even the cables going to the starter.
i727-ucle2-SkY IcS
bengali548 said:
when i plug my phone into my car to play music its fine. when i use my car charger and play music at the same time tis fine but the second the music stop i hear a static noise from my speakers (which is attached to my galaxy)
this static noise is an imitation of whatever my car is doing at that moment (if im reving the engine the static will resemble the revs, same with turn signals)
anyone else experiencing this problem?
Click to expand...
Click to collapse
i get that same thing =/
Damn, I was hoping this wasn't a problem on the gs3. It is probably the only true thing I don't like abut my skyrocket.
I'm assuming it isn't a stock deck? Check your ground and of possible try a new location.
All in all though, Androids micro USB is a horrible horrible connection. Every Android phone I have ever owned makes some sort of hissing sound while charging and listening to audio through the headphone jack. Even the Google Nexus does. But the iphone doesn't. Go figure.
Sent from my SGH-I747 using xda app-developers app
I only get it using the cigarette lighter outlet.
Sent from my SGH-I747M using xda app-developers app
bengali548 said:
when i plug my phone into my car to play music its fine. when i use my car charger and play music at the same time tis fine but the second the music stop i hear a static noise from my speakers (which is attached to my galaxy)
this static noise is an imitation of whatever my car is doing at that moment (if im reving the engine the static will resemble the revs, same with turn signals)
anyone else experiencing this problem?
Click to expand...
Click to collapse
g2tegg said:
I'm assuming it isn't a stock deck? Check your ground and of possible try a new location.
All in all though, Androids micro USB is a horrible horrible connection. Every Android phone I have ever owned makes some sort of hissing sound while charging and listening to audio through the headphone jack. Even the Google Nexus does. But the iphone doesn't. Go figure.
Sent from my SGH-I747 using xda app-developers app
Click to expand...
Click to collapse
On my i747m, I could not use the USB port to listen to music while I was charging via cigarette lighter. There is a definite design flaw. I bought an Ibolt dock and am not able to use it the way it is intended. Even when I wired it myself from scratch (I'm a sound tech) it failed.
Not only does it make white noise and static between songs, but there is some kind of GATE that kicks in 1 or 2 secs after any music pause....it cuts the noise in half but it still remains...and the act of cutting, is an irritant in itself. Further more, even when your playing music, the NOISE is fighting for sonic real estate. I can hear it. I am trained.
So for me, I am running the audio out of the headphone jack. It's 98% better but still not 100%. I don't get the classic REV issue...which has to do with grounding and/or cable shielding. But, if I was you, I would go to The Source store and pick up a Ground Isolator. They have one specific for car issues like yours.
Its a ground loop.
outkast22 said:
Its a ground loop.
Click to expand...
Click to collapse
Is there a way to fix it?
arcticrobot said:
Is there a way to fix it?
Click to expand...
Click to collapse
It MIGHT... be a ground loop.
It might NOT.
Read my post #7.
If your using USB audio, there is an internal design flaw NOISE issue independent from any GROUND issues. (at least with my i747m) I can reproduce the machine like noise in the car, on a desk dock, on a separate stereo system. The Ground Loop isolator did not help my issue but it's worth trying if you get the hum/car interference noise from usb and/or headphones.

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