Does anyone have static when charging? - HTC EVO 3D

What the title says. Whenever I listen to music in ny car through the aux jack and charge my phone theres just a ridiculous amount of static. Whenever i disconnect the charger the static just disappears. Does this happen to anyone else? Anyone know a fix?
Sent from my PG86100 using XDA

all good here
but being a bit of an audio guy.. u may have a problem w/ your charger or your aux cable. audio signals get screwy when when they come close to a power source. so try other cables first before worrying too much.
this is the reason that when u install a car stereo, u run the power cable on one side of the car and the audio cables on the other.

shad0w77 said:
all good here
but being a bit of an audio guy.. u may have a problem w/ your charger or your aux cable. audio signals get screwy when when they come close to a power source. so try other cables first before worrying too much.
this is the reason that when u install a car stereo, u run the power cable on one side of the car and the audio cables on the other.
Click to expand...
Click to collapse
Thanks for the input. I'll try it out
Sent from my PG86100 using XDA

Get shielded rca cables.
#Root-Hack_Mod*Always\

a good quality power inverter (fanless) can eliminate the noise. i use Tripp-lite 150watt in my truck to eliminate the noise
http://www.newegg.com/Product/Product.aspx?Item=N82E16812120305

Related

[Q] Strange noise on MP3 playback in car

Hi all,
I tried searching for this issue but no success on paging through and search still seams to be down (for me).
I use my HD2 as an MP3 player when I'm out and about. The problem is, when I use it in the car (I have an AUX in on my car stereo so plug it directly in via the 3.5mm audio out jack) and have it plugged in to charge (especially when I have SatNav running as well) it makes an odd noise, its not loud and doesn't disrupt the music but it is clearly there and only does it when plugged into charge in the car (not noticed it via earphones when plugged in via PC or Mains).
I tried putting one of those Ferrite cable magnets on to try and stop any interferance but that has no effect.
Has anyone else had this? Does anyone know a way of fixing it as it does get annoying, especially on long trips I have to do for work?
Cheers
BigDave
The charger is causing the interference. Try another charger if you can...
I second that. Your car charger probably isn't shielded enough and you are getting electrical interference.
Try a motorola microusb car charger. maybe 10 bucks on amazon. That is what i am using and I don't get any interference.
xlr8me said:
The charger is causing the interference. Try another charger if you can...
Click to expand...
Click to collapse
I have this too, using my HTC branded cig lighter charger. It is alternator/ignition system noise coming though the cig lighter.
Just about any car audio shop should be able to install a noise filter on your cig lighter socket to eliminate most of the noise. You can also find these on ebay for about $20-30 and install yourself. They are easy to install. Generally they wire inline on the Pos wire and have a 3rd wire coming out of the filter that you tie to a grounded portion of the car body.
I had to install the above mentioned filters i picked up off ebay onto my stereo head unit and amp. There is still a nearly unnoticeable amount of noise. and I mean to hear it you have to turn the volume all the way up, have the car stopped, and no audio playing. Normal road noise or music content otherwise drowns it out. Now that i use my HD2 with the stereo I need to filter the cig lighter as well, I just haven't gotten around to it.
d0ug said:
I have this too, using my HTC branded cig lighter charger. It is alternator/ignition system noise coming though the cig lighter.
Just about any car audio shop should be able to install a noise filter on your cig lighter socket to eliminate most of the noise. You can also find these on ebay for about $20-30 and install yourself. They are easy to install. Generally they wire inline on the Pos wire and have a 3rd wire coming out of the filter that you tie to a grounded portion of the car body.
Click to expand...
Click to collapse
Cheers d0ug, just what I was looking for.
Thanks for the other replies too guys, i know it wasn't a specific charger issue as it did it with my HTC charger (before i broke it) and with my current outlet (a single unit with 2x 12v outlets and 2x USB sockets fed from a single 12v, only 1 usb in use at the moment).
Will try to pick one of those 12v noise filters up as soon as i can

Possible Car dock sound issue out of 3.35mm

Hello everybody i recently got the sprint car dock and i was wondering if anyone else has seen this same kind of behavior as I have been seeing. Basically music played using the 3.35mm jack to an aux port on the car stereo just doesn't sound right. It seems like all the sound is going to my rear speakers while i play music from RDIO and my streamed music from Google play. It seems like the audio sounds much better while the phone is not docked. Has anyone else run into this issue? I remember that original Evo's dock did something where it automatically lowered the volume of the music being sent through the 3.35 jack.
When I had the photon and the dock, I had the same issue. Do you have a case on your phone?
If you do try to push down a bit harder with music playing, I bet you your other speakers will start working again.
The USB audio is picky on just how "properly" seated it is. I also noticed (again the photon) the audio is a bit quieter. Eventually I ended up using the mini jack connector and the usb for charging.
So after re-reading your post, I realized you are not talking about USB but the mini jack. What i have noticed however, I was using the 3.55mm today and the radio had to be turned up a bit more to get the normal listening levels I am currently used to (used to be 22-24, now its 30-35 for volume level on my radio) The sound did sound a bit.... off... but could not quite place it. I noticed the beats audio icon on the top when I had the music playing. It does not appear to be customizable except for an on and off?
anoying sound
As soon as I inserted my phone into the car dock with my 3.5 audio jack in it started making a buzzing sound. I double checked that the phone was seated properly and that the audio jacks were all the way secure. The sound disappeared as soon as I removed it from the dock. It is not very noticible if music is playing but if is not it is terrible. Am I the only one?
This is likely a ground loop issue. I'm seeing it with my dock too. But i also see the exact same issue while charging WITHOUT the dock and always have with every phone in my truck. Unplug the charger, issue goes away.
Eventually I'm going to re-ground my cigarette outlet to a cleaner ground in my truck and see if that solves the issue.
modplan said:
This is likely a ground loop issue. I'm seeing it with my dock too. But i also see the exact same issue while charging WITHOUT the dock and always have with every phone in my truck. Unplug the charger, issue goes away.
Eventually I'm going to re-ground my cigarette outlet to a cleaner ground in my truck and see if that solves the issue.
Click to expand...
Click to collapse
Id have to agree. I dont have the sound issue in my truck atm, using an aftermarket Pyle 7in dvd. But Ive had that same issue in other vehicles/devices (not with my LTE). Does the sound increase with the RPM at any range? If so they make a filter (I think its just a magnet idk) that can clear up that sound.
modplan said:
This is likely a ground loop issue. I'm seeing it with my dock too. But i also see the exact same issue while charging WITHOUT the dock and always have with every phone in my truck. Unplug the charger, issue goes away.
Eventually I'm going to re-ground my cigarette outlet to a cleaner ground in my truck and see if that solves the issue.
Click to expand...
Click to collapse
I do not have the issue at all when I disconnect from the dock. In fact, its minimal once I start to play something like Pandora. But as soon as I don't have something playing the buzzing kicks in and its annoying as hell. I have two 12v ports in my car and several different chargers and it does them for all of them. I think it may be something HTC knows about but hasn't confirmed yet...
modplan said:
This is likely a ground loop issue. I'm seeing it with my dock too. But i also see the exact same issue while charging WITHOUT the dock and always have with every phone in my truck. Unplug the charger, issue goes away.
Eventually I'm going to re-ground my cigarette outlet to a cleaner ground in my truck and see if that solves the issue.
Click to expand...
Click to collapse
This is pretty much spot on. I had to re ground one if my cigarette lighters that did this with my zune.
Sent from my EVO using Tapatalk 2
donatom3 said:
This is pretty much spot on. I had to re ground one if my cigarette lighters that did this with my zune.
Sent from my EVO using Tapatalk 2
Click to expand...
Click to collapse
I'm not saying that it wasn't the case for you, because it certainly is possible. However, correct me if I am wrong, you had the problem regardless of if the phone was in the car dock correct?
I ONLY have the problem when it is in the car dock. That makes me think it's not the 12v plug.
bds369 said:
I do not have the issue at all when I disconnect from the dock. In fact, its minimal once I start to play something like Pandora. But as soon as I don't have something playing the buzzing kicks in and its annoying as hell. I have two 12v ports in my car and several different chargers and it does them for all of them. I think it may be something HTC knows about but hasn't confirmed yet...
Click to expand...
Click to collapse
Can you try something? Take the same charger and try it with the phone in another car. One thats less then 10 years old if possible. (Not that its some magic age of the car, just better/properly grounded radios are more common, imo) Report back and let us know if the sound persists in that vehicle? Thanks
*Not saying yours, or anyone with the problems vehicle is 10+ years old - just wondering if it persists elsewhere.
bds369 said:
I'm not saying that it wasn't the case for you, because it certainly is possible. However, correct me if I am wrong, you had the problem regardless of if the phone was in the car dock correct?
I ONLY have the problem when it is in the car dock. That makes me think it's not the 12v plug.
Click to expand...
Click to collapse
I've had it on multiple devices that had their power adapter plugged into the car. There is also a chance it's your power adapter.
This is not an uncommon problem in car audio, it's so common that many manufacturers make devices to try to reduce the noise. http://www.radioshack.com/product/index.jsp?productId=2062214
Try adding a ground loop isolator into the audio cable. They can't be bought just about anywhere (Amazon, Radio Shack, etc.) for about $15 and should eliminate and ground loop noise. Ground loop noise is why it is so hard to find a car dock that includes audio out. Companies understand consumers want a car dock with 3.5mm audio out but wouldn't be able to design a dock that would eliminate noise in every case.
Filtering the audio line with a ground loop isolator is not a solution for me. They often dramatically reduce high tones and degrade audio quality overall. A real solution is to solve the issue on the electrical side, not the audio side.
OK, I think I understand what you are saying now. I get the normal ground loop whine that I have always gotten in my truck, that changes pitch with RPMs. Known issue with all phones in my truck, whatever.
But today I also noticed a Static (1 second) Static (1 second) Static (1 second) Static (1 second) that was only noticable when my phone was in the dock, plugged in, no music playing (in between songs) AND the beats audio logo was visible (beats was off, I do not use it). Beats logo goes away (when there is more than a second or two of silence) and the static stops. I'm not sure if the static is stopping then because the beats signal processor is turning off, or because the phone is turning off power to the headphone jack. If it is the beats processor turning off, I could try to make a mod to always keep it off (I don't use it anyway).
Is anyone seeing this static (static, not whine) while plugged in but NOT in the dock?
Is this what the OP is seeing? How about the rest of you?
modplan said:
OK, I think I understand what you are saying now. I get the normal ground loop whine that I have always gotten in my truck, that changes pitch with RPMs. Known issue with all phones in my truck, whatever.
But today I also noticed a Static (1 second) Static (1 second) Static (1 second) Static (1 second) that was only noticable when my phone was in the dock, plugged in, no music playing (in between songs) AND the beats audio logo was visible (beats was off, I do not use it). Beats logo goes away (when there is more than a second or two of silence) and the static stops. I'm not sure if the static is stopping then because the beats signal processor is turning off, or because the phone is turning off power to the headphone jack. If it is the beats processor turning off, I could try to make a mod to always keep it off (I don't use it anyway).
Is anyone seeing this static (static, not whine) while plugged in but NOT in the dock?
Is this what the OP is seeing? How about the rest of you?
Click to expand...
Click to collapse
I am not the OP but I am getting the exact same results that you are. It sounds perfect when not in the dock. When in the dock it makes a terrible buzzing noise until I start to play something. I have tried multiple chargers including OEM HTC ones in multiple vehicles and the problem still persists. How can ground loop be non existent when I'm charging my phone with just the cable (outside of the dock)? It has to be something else. I ordered the HTC Stereoclip yesterday and should have it be the end of this week to test wireless play.
willyam111 said:
Try adding a ground loop isolator into the audio cable.
Click to expand...
Click to collapse
I already had one installed for my Epic, and still get the noise on my EVO....
Just out of interest, is the 3.5mm jack going into the Phone, or is it tied into the charger cable. I currently have a MOTO Atrix and the Car Dock USB Cable splits off with an Aux Jack connection. That way you don't need to keep plugging the Aux Cable into the phone everytime you dock. I've never had any interference with this approach.
I'm getting the EVOLTE as soon as possible, so I'm interested in this answer. Plus, how it's being connected may be part of the problem?
csyrell said:
Just out of interest, is the 3.5mm jack going into the Phone, or is it tied into the charger cable. I currently have a MOTO Atrix and the Car Dock USB Cable splits off with an Aux Jack connection. That way you don't need to keep plugging the Aux Cable into the phone everytime you dock. I've never had any interference with this approach.
I'm getting the EVOLTE as soon as possible, so I'm interested in this answer. Plus, how it's being connected may be part of the problem?
Click to expand...
Click to collapse
There is no audio jack coming out of the dock. You still have to use the one on the phone itself.
So I took apart the dock and there is one small chip inside. Seems like a lot for what should just be usb passthrough. I tried removing the blue led hoping that that was the cause of the interference but it did not help.
There are lots of resistors and capacitors on this board. Does anyone know of we remove them all it will be straight usb passthrough? I get MUCH less interference in my truck with just charging and NOT the dock using the same cable. I good way to test this is to turn the Media volume all the way down on your phone and up high in ur vehicle and you will get tons of static and popping.
Any electrical engineers in the crowd? I if not I guess I have to buy a stereo clip :-(
Sent from my EVO using XDA
Those electronics are probably what activate Car Mode.
ahecht said:
Those electronics are probably what activate Car Mode.
Click to expand...
Click to collapse
Activating car mode is done my simply shorting pins 4 and 5 on the USB connector, no electronics required and is why the dock will still put your phone into car mode when not even plugged in.

High pitch squeal with aux cable

I'm have an imonster aux cable and a dynax and both of them create a high pitch squeal. Is it the car and is there anyways to fix this??
Sent from my EVO using XDA
PinnerProxy said:
I'm have an imonster aux cable and a dynax and both of them create a high pitch squeal. Is it the car and is there anyways to fix this??
Sent from my EVO using XDA
Click to expand...
Click to collapse
Its engine noise from your car make sure its plugges all the way in on both ends and twist them a little my truck does the same thing Nd this is how i fix it
Sent from my EVO using xda premium
Funny how an iPod cannot produce the same problem. My OG EVO did the same thing, but my brother's iPod did not.
Sent from my EVO using XDA
Have you tried using your phone and the same cable with a different aux in? Meaning try it hooked to another car stereo or the like. If it continues it is either your phone or the cable. Otherwise it is your car. It is likely a ground issue if it is your car. Do you notice it more or less when you hit the gas pedal? I have heard them before that would whine in time with the speed of the alternator. Almost always a ground issue and sometimes difficult to fix. Many electronics will react to it differently, so it may be more or less noticeable depending on what you have hooked up.
As mentioned check, check all your connections. Try a different cable. Try it with a different source signal. Try it with the vehicle turned off also.
Are both of those devices being powered by the car while you are testing? There is a phenomenon called ground loop interference where if a device is being charged by the car and the stereo is also powered by the same source, as well as being grounded by the same source, in this case the vehicle's auxiliary power ground, then there will be electrical interference going through the headunit when the phone is plugged in to it. One way to get around this is to wire the phone's power source with a different ground.
If its not ground loop interference that you are experiencing, then its most likely just good old electromagnetic interference put out by the alternator or the plugs when they fire, the solution to which are better insulated 3.5mm aux cables.
edit: i forgot to mention they make aux cables with ground loop isolators built inline, but they tend to kill some of the sound as the function is to basically filter out certain frequencies down the line.
Sent from my Transformer TF101 using Tapatalk 2
I bought a new cable that didn't work and i tried it when the car's turned off as well and i don't understand the ish with this squeal sound /:
Are you using a lighter to USB power adapter? Could be picking interference from that. Those things are noisy as anything. I have to unplug it when I am using my Amateur Radio rig. Could try getting a pair of ferrite rings. Wrap the ends of your audio cable a couple of turns and see if that helps.
Also can you adjust your input gain on you headunit? Might be adjusted to too high a setting overdriving the input. Also turn off your preamp if the headunit has one. IIRC you said this happened with your OG EVO. I would suspect the headunit itself rather than phone.
Sent from my EVO using Tapatalk 2
Mine will do this sometimes as well when the phone is ideal it's annoying. I'm sure it's something that is going to need to be patched not sure why the phone is outputting it for my 3D never did. I just don't turn the volume up until I hit play in Slacker or Rhapsody. It won't always do it, but I say it does it more often than not. I will say it sounds better than my 3D the beats by dre comes on when u plug in a cable but it doesn't output as high a volume as my 3D did.
PinnerProxy said:
I bought a new cable that didn't work and i tried it when the car's turned off as well and i don't understand the ish with this squeal sound /:
Click to expand...
Click to collapse
The alternator charges your car's electrical systems... It can produce a whine in your audio.
Did the sound still happen with the car off? If the new cable you tried was bad, why even mention it? You need to isolate the problem before we can really help you.
ls3mach said:
The alternator charges your car's electrical systems... It can produce a whine in your audio.
Did the sound still happen with the car off? If the new cable you tried was bad, why even mention it? You need to isolate the problem before we can really help you.
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Click to collapse
The car off it didn't work and nothing but the aux cable plugged in it still creates the squeal and like a new cable didn't fix it. The second its plugged in completely into the socket it squeals. From time to time it stops while driving
Sent from my EVO using XDA
PinnerProxy said:
The car off it didn't work and nothing but the aux cable plugged in it still creates the squeal and like a new cable didn't fix it. The second its plugged in completely into the socket it squeals. From time to time it stops while driving
Sent from my EVO using XDA
Click to expand...
Click to collapse
Is this a stock or after market head unit?
Sent from my EVO using xda premium
I had the same problem, I tried multiple aux cords and had the same interference. Then I tried my girl's og Evo and had no problems. Brought my phone to sprint and they tried another evo lte, had the same interference. So I bought the HTC stereo clip and the problem was solved. The stereo clip plugs into your aux in your car and connects via bluetooth to your phone. Sounds way better than my aux cord and is wireless!
Sent from my EVO LTE using xda premium
wileout said:
Is this a stock or after market head unit?
Sent from my EVO using xda premium
Click to expand...
Click to collapse
Its stock aux/usb combo for bmws
PinnerProxy said:
Its stock aux/usb combo for bmws
Click to expand...
Click to collapse
....i too am having this problem with my new evo. and i too have a bmw made head unit (i have a mini). im going to buy a new cable tomorrow and try it out. for the record ive never had a problem with a og evo, nexus, gs1, gs2, ipod and ipod touch.
I'm having this same problem with my new EVO LTE. My 3D was fine, but this one with same cables now has this crazy sound going on that is only on when there is no audio being played through my phone. I was thinking about trying the Kensington Noise Reducing AUX cable, but could there be a better alternative, as that doesn't seem to fix it for some or reduces the audio. Worth mentioning, noise changes during accereration, really bizarre, made me laugh actually.
Thanks.
Ground loop isolator is what you need. They're cheap.
Sent from my EVO
mbaseball3 said:
Ground loop isolator is what you need. They're cheap.
Sent from my EVO
Click to expand...
Click to collapse
Either that or a noise reducing aux cable like the Kensington one that's been posted around? I had found it, so I was planning on grabbing it unless a ground loop isolator would be better.. ?
Thanks.
For any who are reading this in 2014...
I had the same problem with my car/phone. Turns out it was the stereo all along, and I had to take the unit out and change the ground, and all done now. :]

Odd whistling noise when connected to aux input in car

I've got an aux input in my car, and today when I tried plugging in my GSIII, I got met with a faint but annoying whistling sound underneath my music.
It stops if there's no sound being sent over the wire, but the moment a notification (or music) starts playing, it comes up.
Car worked fine with my DX, and still works fine with my friends' iPhones, but I get the stupid sound with my brand new galaxy siii. Oddly enough, it works fine with headphones.
any ideas guys? I'm kinda stumped.
Search ground loop isolation. You are getting dirty power to your phone.
Sent from my SPH-L710 using xda premium
none
Do you have the phone charging through the cigarette lighter? You can get ground noise from there, and it will be transmitted through the phone to your stereo.
Hm. Let me try again without it charging, but that's strange. Why did my old DX not experience this?
Assuming that's the issue - will a different cable solve the problem?
edit: So I checked the phone without plugging it into the charger. Still get a whistling noise. It's really more like a high pitched hum. I notice that if I don't plug the plug in all the way it doesn't happen (but I think I only get one channel).
I'm getting the same thing, and it's driving me crazy. At first I thought my brakes were going bad in my car!
I've tried different audio players and apps, but it still always get the noise. The phone is not charging, and I did not get this with my old captivate either.
Any ideas?
Doesnt happen in my Porsche. I'm using Bluetooth audio though.
Sent from my SGH-T999 using Tapatalk 2
Thats strange. I will get that when charging, but only while nothing is playing.
Sent from my SAMSUNG-SGH-I747 using Tapatalk 2
I am having the same issue. First time experiencing it though; never heard it with the iPhone, HOX, or NS
I'm using a line in cable, and when i jiggle it, i can hear the noise change tone at the same time. I have a feeling it might be because it's a regular stereo cable and the microphone combo jack on the phone is not working right with it. But that's just a guess.
It's pretty annoying and its making the phone unusable as a music player.
Happens in my Lamborghini (Dodge Caravan) when using a MP3 player. Usually, if I run my hand down the cable it clears as though it's some kind of static build up in the cable.
Sent from my Transformer TF101 using xda premium
try flipping the cable (putting the aux in side into the phone and the phone side in the aux in) it happens to me sometimes and if I flip the cable it clears it out I couldn't tell you why though. also make sure there isn't any dust in the ports or on the cable ends.
That noise you hear is most likely due to the electrical system in the car. I rent cars all the time for work and never know the shape the electrical sys is in so to resolve the issue I bought a Kensington Cable from amazon and now have CD quality sound from any music app including pandora & spotify.
Hope this helps.:cyclops:
rmelendez3 said:
try flipping the cable (putting the aux in side into the phone and the phone side in the aux in) it happens to me sometimes and if I flip the cable it clears it out I couldn't tell you why though. also make sure there isn't any dust in the ports or on the cable ends.
Click to expand...
Click to collapse
Unfortunately, my cable is RCA on one side (L+R channels split) and regular 3.5mm on other.
nyciz said:
That noise you hear is most likely due to the electrical system in the car. I rent cars all the time for work and never know the shape the electrical sys is in so to resolve the issue I bought a Kensington Cable from amazon and now have CD quality sound from any music app including pandora & spotify.
Hope this helps.:cyclops:
Click to expand...
Click to collapse
Not sure what you mean by "the electrical system" and the "shape" of it. Could you clarify? As I said, I have no problems with other devices in this car.
I would usually suspect something wrong with the car, or maybe a ground loop, but I can plug in my Galaxy S (Captivate) or iPod with the same cable, same everything, just switching out the phone, and the noise goes away.
The way the noise cuts in and out between songs, and when I close the music app, it seems to only happen when the audio chip is getting a signal or is being energized. This is making me think that it may just be a noisy chip :crying:
I was on conf call with SGS3 plugged to AUX, no power charging was going on. And either noise canceling didn't work, or noise was getting in thru AUX line to receiving end. I didn't have problems listening, but ppl on the other end complained, and I had to mute the mic.
:crying:
cashyftw said:
doesnt happen in my porsche. I'm using bluetooth audio though.
Sent from my sgh-t999 using tapatalk 2
Click to expand...
Click to collapse
sorry! Could you speak up please? I couldn"t hear you over the sound of your e-penis
I am having the same problem. My HTC Thunderbolt never had this problem. Same car and cables, I get the hissing and popping until I play something. Then it goes away until I stop the music and then it comes back again. Weird and disappointing.
The problem comes from the 4-pin (TRRS) audio jack in the GSIII combined with presumably bad grounding in my 2007 Honda Accord, or the Aux adapter.
I fixed it with a simple DIY solution. I cannibalized a TRRS headphone jack and bought a TRS (3-pin) port from radioshack. I clipped off the jack with a generous portion of wire, then stripped them and cleaned them from their insulation (they are covered in insulating dye).
I connected 3 of the wires to the TRS connector, and taped the whole thing up. No more hum.
Also known as Road Noise. Where the power cable and audio input are too close to each other. Electrical current emits a small magnetic field which will hinder audio quality and promote road noise from the alternator.
This is a very typical senario in car audio install, when you run the power cable and rca right next to each other.
this buzzing noise happens to me every time i drive my car for the past 3 years:
solution: turn down the car volume. if you keep your car volume half-way, then you wont hear it as much, or you wont hear it at all.... you can make the phone volume as loud as you want though. also, as you accelerate faster, the noise gets louder. watch, try it.

[Q] buzz from 3.5mm jack when charging in car

Wondering if I am the only one who gets an audible buzz when I am in my car using the 3.5mm jack to feed audio to the car stereo, and am charging at the same time. The instant I unplug the charger, no more buzz. Seems that maybe HTC didn't properly isolate the circuits or something.
lukester01 said:
Wondering if I am the only one who gets an audible buzz when I am in my car using the 3.5mm jack to feed audio to the car stereo, and am charging at the same time. The instant I unplug the charger, no more buzz. Seems that maybe HTC didn't properly isolate the circuits or something.
Click to expand...
Click to collapse
Try a different charger. I had that same problem with bad charger.
Sounds like a ground loop. That happens when multiple devices are connected to the same power source and by other means. (Audio cable)
The easiest way to fix it is to unplug the charger. But if you must, try a different plug since usually car outlets are individually fused.

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