Headphone jack EMI - Lenovo P2 Questions & Answers

It's only audible when the audio is low volume, for example during dialogue in a video.
When the radios are turned off, the problem disappears. Seems like a major design flaw to me.
Is every unit affected by this? Is worth to return my unit because of this or should I just switch to bluetooth headphones?

Never noticed this on my device
Sent from my Lenovo P2a42 using Tapatalk

Uibon said:
Never noticed this on my device
Sent from my Lenovo P2a42 using Tapatalk
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More info on this:
https://forums.lenovo.com/t5/forums/v3_1/forumtopicpage/board-id/lp05_en/thread-id/540/page/3
Someone managed to record what it sounds like:
https://youtu.be/r0z6X7zB-pw

Related

Gunshots to speakers when connected to 3.5 mm jack

Hi, have you experienced this problem when you connect active external speakers to Z over 3.5 mm jack? I experienced this even when I used original HTC rom before I rooted my phone and it remains with all ROMs I tested so far including ICS based ones. This strange but unusualy strange sounds reminding big bangs are produced mainly when starting or closing some music apps. Sometimes even between tracks. It there any remedy?
Does the jack have any give to it? Aka wiggle while connected?
Sent from my HTC Vision using xda premium
Spastic909 said:
Does the jack have any give to it? Aka wiggle while connected?
Sent from my HTC Vision using xda premium
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absolutely not-this is new HW. and it is happenig while not even touching the phone.
Are you using any sort of graphic eq or sound enhancing app? Was thinkin maybe the audio was clipping, but you stated it happens more when opening/closing audio.
Does the same thing happen with headphones?
If it does and also happens on every rom you use it sounds like defective hardware. Hope you still have a warranty
Sent from my HTC Vision using xda premium
Spastic909 said:
Are you using any sort of graphic eq or sound enhancing app? Was thinkin maybe the audio was clipping, but you stated it happens more when opening/closing audio.
Does the same thing happen with headphones?
If it does and also happens on every rom you use it sounds like defective hardware. Hope you still have a warranty
Sent from my HTC Vision using xda premium
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Yes this is happening when I manipulate open/close any music app. I tried several ones and it is always there. I can hear very silent clipping having normal headphones connected, so I assume my speakers are very sensitve for this. I will try different ones too. BTW my phone main board was replaced recently in warranty for different reason and I think problem was there before. Even with original board.

Connected to external speakers (Hifi system) - while idle crazy noises / cracking

Ok, here is what I found out. I did unroot teh devide and reset it to factory. To wrap my findings up:
I connected my Nexus 7 to my AV Receiver and Speakers.
1) When playing Music all is fine - no humming / buzzing / cracking!
2) WhenMUSIC IS OFF, but SCREEN IS ON you can start hearing a buzzing ( which I could live with as I know analogue sources do sometimes have that buzzing, although none of my other devices such as the Galaxy S4 has it)
3) THIS IS NOT ACCEPTABLE! Whenever the Screen turns off I get a high pitched buzzing that could potentially ruin my speakers!
Can anyone confirm this or help me out here?
Here is a video with my findings https://www.youtube.com/watch?v=Ug4T...Yzhu26gJOT36mg
Kind Regards
Riccardo
Riccardo83 said:
Hello guys, i have a random problem. I have my nexus connected to external speakers and only when idle I hear weird crackling noise, when playing music or going through menu and such it almost disappears.
I have my nexus connected via aux cable. It is really bad that cracking noise.its not like a smooth humming that u can expect from analog sources. It gets also high pitched etc and I'm afraid to break my speakers once it goes idle.
Is my device faulty?
BTW with headphones attached I don't really get it much.
Gesendet von meinem GT-I9505 mit Tapatalk
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I might suggest you try using a ferrite core and see if that helps.
mdamaged said:
I might suggest you try using a ferrite core and see if that helps.
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Sorry I dont really know what u mean. I tested on 2 hifi systems with also one premium cable..
Riccardo83 said:
Sorry I dont really know what u mean. I tested on 2 hifi systems with also one premium cable..
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One of these: http://www.thatcable.com/product/7mm-Clip-On-Ferrite-Core (you can find them cheaper, this was only for example) it reduces click and whine, they are cheap enough so if it doesn't work it's no big deal.
But why does it happen when idle? Do you get any noise, Crack, anything when u hock it up to a receiver, external speakers?
Gesendet von meinem GT-I9505 mit Tapatalk
Riccardo83 said:
But why does it happen when idle?
When I oldy music or walk through menu settings it's a lot let / reduced. Do you get any noise, Crack, anything when u hock it up to a receiver, external speakers?
Gesendet von meinem GT-I9505 mit Tapatalk
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Gesendet von meinem GT-I9505 mit Tapatalk
Riccardo83 said:
But why does it happen when idle? Do you get any noise, Crack, anything when u hock it up to a receiver, external speakers?
Gesendet von meinem GT-I9505 mit Tapatalk
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Do you want an explanation or a fix? I am telling you of a possible fix, I would have to do a site survey, and test the equipment with various pieces of equipment to accurately determine the why.
No, I don't hook my tablet up to my equipment, they are capable of playing all my music without the aid of my tablet, the suggestion I made was to correct noise which can be caused by grounding or external RF, buy the core, or don't buy the core, it's all the same to me, I'm just trying to help you out here.
I'm very thankful. But nevertheless it would be interesting to see if others experience the same. I'll order it anyway thanks.
Gesendet von meinem GT-I9505 mit Tapatalk
I use an older phone (Droid RAZR Maxx) that is connected to my home stereo for Pandora, Google Music, etc and yes, I have the loud crackling noise. Actually, I should say I had the noise. I used a different device, called a ground loop isolator. I would assume it serves a similar purpose as the core, to simply reduce grounding noise. They are cheap on amazon or newegg or something.
I think this actually the exact one I have:
http://www.amazon.com/PAC-Ground-Is...92235085&sr=1-1&keywords=ground+loop+isolator
The other day I plugged my N7 to my Logitech Z323 speakers and I had blank noise aswell during idle.
It would fade into the music as soon as music played louder than the noise itself but it was still there.
What I did was a bit random but it worked and I believe the noise is caused by the lack of grouding.
Plugged the N7 to my speakers (the Z323 speakers have 2 extra aux slots) with an aux cable and then plugged the speakers to my computer through their own aux cable. This created grouding and the noise disapeared.
Was it really just a blank constant noise? If it was just that fine I could live with it. But this noise I'm experiencing is not smooth it gets high pitched too etc. Not a stable humming.
I plugged mine into an av receiver, only Nr 414.
When I'm back home I'll record a video for u to see.
By the way I rooted my device. But I doubt that has anything to do with it?
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My device is also rooted but I doubt it has anything to do with it.
In my case, the sound was similar to when you don't properly plug the aux cable hence why, plugging the speakers a second time, onto my computer fixed the issue.
username4this said:
My device is also rooted but I doubt it has anything to do with it.
In my case, the sound was similar to when you don't properly plug the aux cable hence why, plugging the speakers a second time, onto my computer fixed the issue.
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I dont get what u mean with pluggin in a second time? I only want to connect my N7 with my av receiver. Are you saying that pluggin in the cable from the AV Receiver into the Laptop and then pluggin in the N7 afterwards helped?
Please verify once more, have u connected to a AV Receiver, or just some Speakers?
http://www.youtube.com/watch?v=0citcj-adYc&feature=youtu.be
This is what I did.
I know it's not exactly the same thing but I bet the cause is the same.
i have my nexus hard wired to my car. using the headphone jack, i can hear all kinds noise when booting up. during playback there are no issues, but once i pause or stop playback, the DAC seems to go to sleep mode, then i can hear some noise again. ofcourse, its not as loud as noise i hear during bootup, but still annoying.
i switched to using the behringer uca 202 usb dac with an otg cable, and all problems went away. also audio quality became definitely much better.
Ok, here is what I found out. I did unroot teh devide and reset it to factory. To wrap my findings up:
I connected my Nexus 7 to my AV Receiver and Speakers.
1) When playing Music all is fine - no humming / buzzing / cracking!
2) WhenMUSIC IS OFF, but SCREEN IS ON you can start hearing a buzzing ( which I could live with as I know analogue sources do sometimes have that buzzing, although none of my other devices such as the Galaxy S4 has it)
3) THIS IS NOT ACCEPTABLE! Whenever the Screen turns off I get a high pitched buzzing that could potentially ruin my speakers!
Can anyone confirm this or help me out here?
Here is a video with my findings https://www.youtube.com/watch?v=Ug4T-ta6Z24&list=UU77YO7cRKYzhu26gJOT36mg
Kind Regards
Riccardo
It seems like a grounding issue in your car or you need a better shielded wire. Just my opinion for what ever that is worth.
Sent from my Nexus 4 using xda app-developers app
in my car? Do you see that im driving ?
Riccardo83 said:
in my car? Do you see that im driving ?
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dude, are you using the headphone jack? issue is just a design flaw. get a USB DAC and OTG cable
schlager said:
dude, are you using the headphone jack? issue is just a design flaw. get a USB DAC and OTG cable
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well yes its a headphone jack and its quite a premium cable nothing cheap. ive tested many devices plugged in via aux calble.. galaxy s4, lg phone, iphone 4 / 5 - NONE of them had these issues.
Its quite bad that in order for me to play music from my nexus i need to buy extra stuff dont u think?

Phone beeps with minijack

Got my g3 today and I loved it to I connected a headset....
When I connect headsett it's goes beep beep once and with my bose headset it makes interference sounds.
Anybody else have this issue?
I think i get it with earphones in the box at certain volume
Sent from my LG-D855 using XDA Premium 4 mobile app
I have the same issue. With my custom headphones I hear a lot of hum noice during music play but with other headphones it's ok so I think that problem is with impedance. 25 ohms for custom (1964Qi) and 15 ohms Sony MH1C. If anyone can test it or has idea how to solve it?
HoriCZ said:
I have the same issue. With my custom headphones I hear a lot of hum noice during music play but with other headphones it's ok so I think that problem is with impedance. 25 ohms for custom (1964Qi) and 15 ohms Sony MH1C. If anyone can test it or has idea how to solve it?
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Today I tested 2 LG g3 and 1 LG G2. All off the phones do have this issue we have. But only with my bose. Testet nye pair of headphones and same problem so our phone is OK and I am buying a new headset possibly wireless
C'mon I don't think that problem is in my 500$ headphones. It looks like some incompatibility but needs to be investigated somehow. Some portable headamp or DAC can help as I need good headphones
HoriCZ said:
C'mon I don't think that problem is in my 500$ headphones. It looks like some incompatibility but needs to be investigated somehow. Some portable headamp or DAC can help as I need good headphones
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The problem is in the LG phones not just ours but all LG phones. Maybe it is software related?
It's possibly hardware related and just poor isolation of the circuits used for audio on the phone. I hear the two beeps on earphones and headphones but little/no static.
Dubhar said:
It's possibly hardware related and just poor isolation of the circuits used for audio on the phone. I hear the two beeps on earphones and headphones but little/no static.
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Yeah but why would they make a phone that way
chriso89 said:
Yeah but why would they make a phone that way
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It's cheaper. PC motherboards are only _just_ starting to get isolated audio as a standard feature and think how long they've been around. To isolate components from other parts you need more room as well, something phones don't have.
Try pulling it in and out a few times and then wrot wipe the connector. I've read some making this work. Seems to be an oil or something in there.
Update. This did the trick for me!

Headphone volume low

Has anyone noticed that headphone volume isnt that loud..
Any ideas how to make better?
Sent from my LG-H812 using Tapatalk
Yea I agree
Not till root.
The G3 suffered from the same ailment, but it was easily fixed by editing a file with the max volume value. There was also an app on the play store, but as stated above - root is required.
Sent from my Nexus 9 using Tapatalk
Same **** here. Even cm made a better rom for 1+1...
Sent from my LG-H815
it was easily fixed by editing a file with the max volume value.
sseuorosal said:
it was easily fixed by editing a file with the max volume value.
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Yeah but why do people need to worry about fixing all these bugs for a phone that costs $600+ and is supposed to be a flagship. I bet it also sucksnt recording audio in rock concerts and alike.
Sent from my LG-H815
So what have to be edited to gain the volume ? Can someone provide me a link ?
Verstuurd vanaf mijn LG-H815 met Tapatalk
Agreed. I can set it to max volume and not be bothered at all.
Agree headphone volume is low but I'm usually BT streaming to my car so all good there.
Sent from my VS986 using Tapatalk
drt054 said:
Agree headphone volume is low but I'm usually BT streaming to my car so all good there.
Sent from my VS986 using Tapatalk
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I cannot take a car into the train.
officerdoofy said:
I cannot take a car into the train.
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Hahahaha
Sent from my SM-G920T
The volume is low on my Bose headphones, same headphones on my nvidia tablet sound pretty good. Blue tooth isn't bad with an equalizer app.
officerdoofy said:
I cannot take a car into the train.
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I've found that the type of headphones you use play a factor as well. I have a pair of Bose in ear headphones that are designed for sports activities such that they stay in your ear no matter how crazy you move; the volume is fairly low with those headphones, but with the Quadbeats that LG provided with the phone - the volume gets plenty loud. I've actually started using the ghastly red and black headphones just because they're decent quality and can get very loud.

Bluetooth randomly cutting

So my Bluetooth randomly cuts audio and starts stuttering... Any ideas? I'm full stock...
Sent from my Pixel XL using Tapatalk
on what kind of device, and what version of BT does that device support?
It happens to me too, but only with cheap devices listening to music, it does not happen when talking.
Happens on my Echo & 2014 Audi A4. People say disabling wifi will fix it. 7.1.2 looks like it IMPROVES it but doesn't RESOLVE it.
I say returning the phone and buying an iPhone will fix it...because both my Echo and my Audi worked fine with my iPhones.
It happens with my Sony headphones mdr-x950...
They are pretty good I guess...
Sent from my Pixel XL using Tapatalk
Android bluetooth has always been a bit lame.
TonikJDK said:
Android bluetooth has always been a bit lame.
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In the current day and age where everyone has bluetooth headsets...how do they get away with this?

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