Hey there everyone!
As my title says, my proximity sensor has gone crazy! It is of course a hardware problem but i need some help here! 2-3 weeks ago, i dropped my nexus⁴ in a bowl of dal , upside down (the phone's upper portion was affected only, the lower one was intact). For some hours the earpiece didn't work properly but the proximity and ambient light sensors were working properly and so were the camera(front and back both) and flash! Whenever i tried calling someone, the earpiece didn't work BUT as soon as i plugged in my earphones(with mic), i could hear and respond without any hiccups.. I thought it might be due to the phone detecting that there's an earphone already plugged in (before it was plugged in) to the phone , probably because the earphone jack got some dal (liquid) stuck in it. Anyways, i tried finding a solution for this and then i installed "SOUNDABOUT", an app which changes the way the phone's jack and earpiece and speakers behave (in short, controls what does what and media and phone call output) . I set the phone call audio to "earpiece" and media audio to "speaker" which works great and which solved the earpiece problem for me but now whenever an object comes in range of the proximity sensor, the screen turns itself off and turns back on as soon as the object is removed. This is making me crazy. However, when i switch the phone call audio to "earphones with mic" and restart the phone, the proximity sensor works fine but then no sound from the earpiece.
NOTE: When i restart the phone, for 2 mins or so, everything works flawlessly and works like it is supposed to, but after that it starts malfunctioning(maybe some service is causing this malfunction? )
I need your help with the following questions
1. Is it a hardware problem? (Since, the jack and sensors are one hardware unit)
2. If it's a software problem , can it be fixed without reinstalling the OS?
3. If it's a hardware problem, will i have to replace the jack unit?
Oh, and btw i am using Paranoid Android 4.6 BETA1 and Faux kernel.
Thanks!
Dal? You got goop in your phone. But it still sort of runs. I'd take it apart, take out the battery, then use the highest alcohol content you can find and rinse out the phone use at least 70% alcohol
Sent from my SAMSUNG-SGH-I957 using XDA Free mobile app
jd1639 said:
Dal? You got goop in your phone. But it still sort of runs. I'd take it apart, take out the battery, then use the highest alcohol content you can find and rinse out the phone use at least 70% alcohol
Sent from my SAMSUNG-SGH-I957 using XDA Free mobile app
Click to expand...
Click to collapse
It's a nexus⁴ -_- doesn't have a removable battery.. Phone is working perfectly...if you have a solution, please tell but don't crap the thread...thank you
if you don't know how to remove n4 battery - doesn't mean that it's not removable
and about your problem - as jd1639 suggested, try to clean mainboard, especially proximity sensor/ headphones connector area and maybe sensors itself
RolF2 said:
if you don't know how to remove n4 battery - doesn't mean that it's not removable
and about your problem - as jd1639 suggested, try to clean mainboard, especially proximity sensor/ headphones connector area and maybe sensors itself
Click to expand...
Click to collapse
I know how to take apart the n4 and remove the battery and all but haven't done it before...maybe ifixit guide can help?
So should i open up my N4 and clean the sensors and the jack...i don't think there's anything wrong with the sensors as they work perfectly but the only glitch is they work all the time
Nevermind guys! I fixed it! all i did was turn off the sound about service and it's working flawlessly! Thanks a lot for your help anyways!
Just open the phone and remove mainboard to clean it with isopropyl alcohol. Don't wait until corrosion damage it completely . Also not bad idea would be take a look at sensors/headphone jack assembly ...
Related
The rear speaker of my JAMin blew... I need a replacement so I can do the work myself and not have to send it over for a week to the lab. Where can I get one?
Thanks,
Nir
How to repair the sound issue on Prophet
Hi
I could read a lot of posts on that issue and found this solution:
Remove the battery cover. Then the camera cover: to do so, lift up the gently the cover starting from the side of the battery.
You will see something looking like a fan. This is the speaker. the problem is with the red wire whixh connect the speaker.
Turn on your prophet and run your favourite MP3 song.
then touch the red wire with your stylus. The sound should come back. Insert a piece of folded paper to keep the cable properly fixed. that's all
Watch out not to wish to fix it too nicely, you could damage the wire !
Hope this help, otherwise a return to the service department will be necessary !
Hope this helps
Regards
Régis
Hay the paper trick works!
I went here to learn how to remove the flap to the speakers:
http://www.modaco.com/index.php?showtopic=240109
Well, my speaker had the voice coil broken... touching the membrane would bring it back to life but that is no real solution. I replaced it with a speaker from a used old cellphone with some minor use of hot glue to fix it in place and seal around it.
It works now just as new.
Nir
yeah it is a real Problem.
mine is broken twice in 6 months.
tried the paper thing. but it sometimes sounds weird and there's some hissing. maybe I did it wrong. so I tweak it a bit and just lost it completely. no sound whatsoever now.
went to the service center today. they said that they have a new batch of speaker which supposed to be better than the previous one. if anyone can confirm.
rlou77 said:
Hi
I could read a lot of posts on that issue and found this solution:
Remove the battery cover. Then the camera cover: to do so, lift up the gently the cover starting from the side of the battery.
You will see something looking like a fan. This is the speaker. the problem is with the red wire whixh connect the speaker.
Turn on your prophet and run your favourite MP3 song.
then touch the red wire with your stylus. The sound should come back. Insert a piece of folded paper to keep the cable properly fixed. that's all
Watch out not to wish to fix it too nicely, you could damage the wire !
Hope this help, otherwise a return to the service department will be necessary !
Hope this helps
Regards
Régis
Click to expand...
Click to collapse
That's great, this fixed my problem. After I touch the red wire with my stylus, the speaker just works fine, don't even need a folder paper.
starrayfly said:
That's great, this fixed my problem. After I touch the red wire with my stylus, the speaker just works fine, don't even need a folder paper.
Click to expand...
Click to collapse
I'll try this one myself - my speaker just died again - it's been back once already.
Well, I followed the instructions above and now I have a working speaker again. A very low tech fix to a high tech device.
I have found a small bit of sponge does the job better than folded paper.
what is the type of speaker.
i mean can i use any speaker?
what's the best?
Mohammad, you seem to have missed the point of the replies in this thread. We don't know where to get another speaker from but we do know how to make the existing one work again.
oh, dude!!!
sorry
What a piece of ugly Speaker: O2 xda Neo!
Hay Guys,
I am suffering from this nasty problem since sometime. My brother has tweaked the speakers with a metal piece seem to work. However if I use speakerphone, it goes off.
Is there a permanent solution to this constant spurce of unhappiness.
Incidently I have been blessed with a on & off camera problem as well. I think I will never buy a DOPOD product in my life again.
My Camera has those colour matrix instead of proper images. Occasionally it behaves normally. I have tried hard reset already.
Any body? help !!!!!
Ugly Speakers: O2 xda Neo
Hay Guys,
I am suffering from this nasty problem since sometime. My brother has tweaked the speakers with a metal piece seem to work. However if I use speakerphone, it goes off.
Is there a permanent solution to this constant spurce of unhappiness.
Incidently I have been blessed with a on & off camera problem as well. I think I will never buy a DOPOD product in my life again.
My Camera has those colour matrix instead of proper images. Occasionally it behaves normally. I have tried hard reset already.
Any body? help !!!!!
I tried this....when i touched the red wire i got the sound back i was happy.. but not for long cause touching the wire now doesn't help anymore so i have to send it back
drdeepak said:
Hay Guys,
I am suffering from this nasty problem since sometime. My brother has tweaked the speakers with a metal piece seem to work. However if I use speakerphone, it goes off.
Is there a permanent solution to this constant spurce of unhappiness.
Incidently I have been blessed with a on & off camera problem as well. I think I will never buy a DOPOD product in my life again.
My Camera has those colour matrix instead of proper images. Occasionally it behaves normally. I have tried hard reset already.
Any body? help !!!!!
Click to expand...
Click to collapse
I wedged in a piece of foam. That's worked a treat.
The manufaturing quality of HTC is bad
I also have the speaker problem. And thanks for all of you to suggest that sponge and folder trick. I did it and i have put a small slice of ear plug sponge. For past 2 days my spearker is working. But dont know how long will this sponge give my speaker lifesupport. I am sure after few days again its going to be problem. Hey,...... is there anyone in this thread who has used sponge/paper and the speaker is working for long time.. at least a year ?.
These HTC products seem really bad quality products.
that worked
http://www.4shared.com/file/6894706/ca35cee6/altavoz_s200.html
motorola l7 speaker is too a candidate
It's too bad they saved on the speaker. Guess the manufacturer of the speaker had a very nice presentation @ HTC
Trying to download that pdf file, but it's not working :/ However I've read on other occasions that people talk about that motorola speaker as a replacement. Might be worth giving a more detailed look into that.
What exactly is the problem with the speaker btw? Did anyone narrowed that down already? Why is the speaker not functioning properly?
pdf
The file contains instructions to change the original speaker using the spk of a motorola v525.
I did it yesterday, and works fine, but isn´t easy to do it
This is not my phone but a friend's phone that I am trying to fix. She dropped it 2 stories and the phone, due to its sturdiness, looks absolutely fine.
In any case, there is nothing wrong with the phone:
External speakers (used for playing music, watching Youtube, etc) works
When calling people, they hear me just fine [works]
However, the in-call speaker doesn't work (when I call people, they can hear me but I cannot hear them)
Here's what I have tried so far:
-putting the call on speaker works but that's probably because it switches to use the external speaker
-I reflashed her ROM but the problem still persists
-if I use headphones, I can hear the caller speaking
Any other things I can try?
P.S. I am amazed at the sturdiness of this phone!
Two stories, did you say? She's lucky.
You gotta open it up- see if the contacts of the handset speaker are in the right place. I don't think it would have gone bad.
While you are at it, make sure the antenna contacts are proper, a known problem after dropping this phone is low or erratic signal after a fall.
Swyped from my HTC HD2 using XDA Premium
2ft or 2meters right?
but 2 stories high & it's still OK?
man what casing was she using?
anyways there could be a dislodge wire/ connector from that fall & luckily it's just that:fingers-crossed:
nexus14 said:
This is not my phone but a friend's phone that I am trying to fix. She dropped it 2 stories and the phone, due to its sturdiness, looks absolutely fine.
In any case, there is nothing wrong with the phone:
External speakers (used for playing music, watching Youtube, etc) works
When calling people, they hear me just fine [works]
However, the in-call speaker doesn't work (when I call people, they can hear me but I cannot hear them)
Here's what I have tried so far:
-putting the call on speaker works but that's probably because it switches to use the external speaker
-I reflashed her ROM but the problem still persists
-if I use headphones, I can hear the caller speaking
Any other things I can try?
P.S. I am amazed at the sturdiness of this phone!
Click to expand...
Click to collapse
Hd2 have two speakers, front called ear speaker and back speaker which is activated on notification, playing media files and putting call on handsfree mode.
You need to check Ear speaker.
There are few movies on youtube how to open hd2, search for disassembling hd2.
Check connector on ear speaker.
If doesn't help then buy new one there on internet from 5 to 10$ if you are from States you can have free shipping.
Changing ear speaker isnt complicated just be sure to check few videos before doing it.
I have same issue atm, ill need to do this also.
Sent from my NexusHD2 using xda premium
ph03n!x said:
Two stories, did you say? She's lucky.
You gotta open it up- see if the contacts of the handset speaker are in the right place. I don't think it would have gone bad.
While you are at it, make sure the antenna contacts are proper, a known problem after dropping this phone is low or erratic signal after a fall.
Swyped from my HTC HD2 using XDA Premium
Click to expand...
Click to collapse
Sorry for the late reply. Based on the responses I got, it seems the only way to fix this is to open it up. Thanks for your help
mengfei said:
2ft or 2meters right?
but 2 stories high & it's still OK?
man what casing was she using?
anyways there could be a dislodge wire/ connector from that fall & luckily it's just that:fingers-crossed:
Click to expand...
Click to collapse
She was not using any case at all, surprisingly.
simply replace the speaker
its very easy just unscrew four screws from back and and lift the front from back from edges from opener
here is guide for hd2 from mikechannon
http://mikechannon.net/PDF Manuals/HTCHD2Dismantling.doc
Similar problem here
Hi,
I have the exact same problem you have regarding the non-working ear speaker. I inherited my phone so I don't know if it's been dropped or not, or if the non-working ear speaker is due to software and/or ROM issues. The previous owner had winmo and he said it worked fine.
I suspect it's due to software since sometimes the ear (front) speaker does work, but usually not. I've tried a bunch of different ICS ROMS (CM9, AOKP, PA, currently on Slim-ICS 4.2) and the problem remains which would seem to point to hardware failure, no? What confuses me is the fact that it sometimes (rarely) works. Most of the time I have to enable speakerphone to hear the other side of calls.
Any suggestions would be appreciated.
Thanks
I have enclosed a clip from logcat in case anyone sees anything weird that I'm not seeing.
janus19 said:
Hi,
I have the exact same problem you have regarding the non-working ear speaker. I inherited my phone so I don't know if it's been dropped or not, or if the non-working ear speaker is due to software and/or ROM issues. The previous owner had winmo and he said it worked fine.
I suspect it's due to software since sometimes the ear (front) speaker does work, but usually not. I've tried a bunch of different ICS ROMS (CM9, AOKP, PA, currently on Slim-ICS 4.2) and the problem remains which would seem to point to hardware failure, no? What confuses me is the fact that it sometimes (rarely) works. Most of the time I have to enable speakerphone to hear the other side of calls.
Any suggestions would be appreciated.
Thanks
I have enclosed a clip from logcat in case anyone sees anything weird that I'm not seeing.
Click to expand...
Click to collapse
Same thing for me. Im 99% sure is hardware failure, ear speaker died or it is disconnected from slot.
Why im thinking this, when gently tap back of cover where speaker is i can here like its disconnected from slot. Sometimes when i tap while in call sound come back for sec.
Next week ill dissemble my hd2 to check if its disconnected or ear speaker died.
Anyway you can buy ear speaker on net for few bucks, they are mostly for u.s. model but think its same as for eu version
Sent from my HTC HD2 using xda premium
Looks like this may be more common than initially thought.
Any one know of any app or diagnostic software in Android that can be used to test the rear and ear (front) speakers to determine whether this is a hardware or software issue?
I'd like to make sure this is a hardware issue before opening the phone up.
Hello guys! My loudspeaker suddenly stopped working few weeks ago. I know the cause, and I am pretty sure it is hardware related.
Here is the story:
I installed this ROM (don't think it's important). It worked fine for about a month. The sound volume was lower than MoKee or MIUI, so I started searching for some solution.
I followed a guide similar to this to boost volume, and it worked!
Although I read in the post to not set the value over 95 (to avoid damaging speakers), I decided anyway to set it to 100, because I didn't think that could happen. Sound was very loud, and I was very happy.
Next morning, alarm screamed very strong, but suddenly stopped ringing. I realized my mistake, loudspeaker is completely mute since then.
Earpiece, headphones, microphones work, everything works except loudspeaker.
I hoped so much that was software. I formatted and installed some other ROMs (MoKee, MIUI, CM12) but still no sound. Then I restored a previous MoKee backup (taken when sound worked) but no success. Unfortunately it's a hardware thing.
I bought a new loudspeaker, learnt from YouTube how to open the Note, and replaced it. Still no sound.
Then I tested both loudspeakers (the original and the one I bought) and they both emit sound when attached to an external source (jack plugged to mp3 player). So the problem is not in the loudspeaker itself!
My knowledge ends here.
How can sound stop working by simply raising a software value? But above all, how can the loudspeaker work correctly, but not when placed into the phone? Is there another component that can be damaged in abovementioned way? If so, can that component be replaced?
I hope somebody could share some knowledge to help me solve the problem, or at least point to the right direction. Thanks in advance.
Open your Phone and look if something "looks" broken and make a picture for analysing. It can be not anything but more that just one piece that's broken.
(Sry for bad English, I'm from Germany)
OverBit said:
Open your Phone and look if something "looks" broken and make a picture for analysing. It can be not anything but more that just one piece that's broken.
Click to expand...
Click to collapse
I opened it many times today, but discovered nothing wrong or weird, although I'm not an expert so maybe I simply haven't noticed.
Will post picture as soon as I manage to take photo without phone
Yeah, its like taking a selfie with your phone on your phone without mirrors, only Chuck Norris can do that
(sry for bad English, I'm from Germany)
Some photos
I resurrected my old phone and took some photos. As I said, there's apparently nothing weird, nothing that appears burned or cut.
Here three photos (full phone, upper part, lower part) the loudspeaker contacts are highlighted.
I don't expect a hint on how to fix that (although I hope so much ) because I know this forum is meant for developers/modders/those working with software. My real question is:
Why after just altering value in mixer_paths.xml my phone is now mute? Can someone describe how the sound goes from the CPU to the loudspeaker? Is there something I can do?
udda90 said:
I resurrected my old phone and took some photos. As I said, there's apparently nothing weird, nothing that appears burned or cut.
Here three photos (full phone, upper part, lower part) the loudspeaker contacts are highlighted.
I don't expect a hint on how to fix that (although I hope so much ) because I know this forum is meant for developers/modders/those working with software. My real question is:
Why after just altering value in mixer_paths.xml my phone is now mute? Can someone describe how the sound goes from the CPU to the loudspeaker? Is there something I can do?
Click to expand...
Click to collapse
I did the exact same thing. I replaced the loudspeaker just like you. My sound still doesn't work. I have done a complete factory reset and tried new roms and nothing works.
tripper22 said:
I did the exact same thing. I replaced the loudspeaker just like you. My sound still doesn't work. I have done a complete factory reset and tried new roms and nothing works.
Click to expand...
Click to collapse
My friend device redmi note 3g got same problem.. tired change with new rom.. new speaker..and factory reset that all not work..so open the case..and discovered .the problem came from cpu/chip . coz mtk chipset camera n sound came from cpu..
Hi Guys
I have exactly the same problem with my Xiaomi Mi3. After display replacement lound speaker stopped working. While I had broken display (just the touch screen, dispay was fine) loudspeaker worked fine (I cannot switch off alarm, even shut down the phone)
I bought new speaker, but sound still doesn't work. Do you think that it is comming from CPU? It is possible but I don't think so, because everything works fine via earphones or bluetooth speaker.
Did you find any solution?
tripper22 said:
I did the exact same thing. I replaced the loudspeaker just like you. My sound still doesn't work. I have done a complete factory reset and tried new roms and nothing works.
Click to expand...
Click to collapse
nokovica said:
Hi Guys
I have exactly the same problem with my Xiaomi Mi3. After display replacement lound speaker stopped working. While I had broken display (just the touch screen, dispay was fine) loudspeaker worked fine (I cannot switch off alarm, even shut down the phone)
I bought new speaker, but sound still doesn't work. Do you think that it is comming from CPU? It is possible but I don't think so, because everything works fine via earphones or bluetooth speaker.
Did you find any solution?
Click to expand...
Click to collapse
I tried many other ways, none of them worked. I ended up buying a small BT speaker and carrying always with me.
In my case I learned in the worst way that excessive software amplification can burn audio chip. I replaced EVERY replaceable part (speaker, USB/speaker lower board, main ribbon cable, maybe others I don't remember) with no success.
@tripper22 I think you have no options. If you did my same steps, sadly your sound is lost. I have not yet replaced my phone only because there was a recent increase in development, and many custom ROMs to flash, but I will probably change that phone sooner or later.
@nokovica My sound from earphones or bluetooth is working too. I remembre reading that the audio amplifier is in a separate chip.
Anyway, your problem looks like a HARDWARE issue, since you didn't played with system configuiration. This is easier to fix (if it's fixable, of course).
If you did the replacement, you could check twice if some ribbon cable went damaged. You could try turning on your phone while open (remove back panel and expose board and cables) and see if works this way. You could check with a multimeter wether some signal (albeit small) come to the buzzer. In my case I discovered that a little signal (2-5 mV peak) reached the buzzer, but wasn't enough to make a sound. Rechecking after some months revealed that even that little signal is now gone (maybe sound chip damaged further).
If someone else did the replacement (hopefully Xiaomi assistance) it's their fault, and you can usually ask for repair for free.
Mi3 Loud Speaker Problem
@nokovica
Even I am facing the same problem with my Mi3 . After screen replacement ( touch + digitizer ) My loud speaker is not working , however phone speakar and mic is working perfectly fine , even the headphones too. I also detected one of the problem with Network Signals , if last for only few seconds and then it goes off , i tried placing many sims, but no luck . Can any one in the forum provide some solution to the Network Signals ?
even I have the same problem with my redmi note 3. I just opened back case, sub-board loudspeaker and re-assembled it. I didn't touch motherboard or any flex on upper side. Loudspeaker stopped working since then. Swapped with new part but it still doesn't work. Headphones and ear piece works fine. doesn't play music on bluetooth but hands-free works on bluetooth. how could have damaged audio chip on motherboard?? I barely touch it. didn't even unscrew it.
ilyasabdul said:
even I have the same problem with my redmi note 3. I just opened back case, sub-board loudspeaker and re-assembled it. I didn't touch motherboard or any flex on upper side. Loudspeaker stopped working since then. Swapped with new part but it still doesn't work. Headphones and ear piece works fine. doesn't play music on bluetooth but hands-free works on bluetooth. how could have damaged audio chip on motherboard?? I barely touch it. didn't even unscrew it.
Click to expand...
Click to collapse
Did you solve? I have exactly the same problem
I have faced with no audio (at all) with mi5s
couldnt call or answer (hanging phone)
speakers dont work
erarphone dont work
i flash several times the phone and reste factory it and no change.
i read somewhere thet it resolved with warming sound IC in mainboard.
have any body solution or explane to problem?
I got the charging port of my S5 wet by accident. I immediately took the battery out dried it for 24 hours etc. etc.
Now it seems to work fine, apart from the microphone.
I did some googling and discovered you can replace the charging board which includes the lower mic. So I ordered a replacement Samsung Galaxy S5 G900 USB Charging Dock Port Flex Cable + Mic & Sensors REV08A
I fitted without any problem, but I still have the same issue! I was pretty sure this would fix it as I replaces the whole microphone assembly.
I've downloaded a few hardware test apps and they cant detect any sound from the lower mic, only the top mic works (like when on speakerphone)
Any other suggestions? I suppose the problem must be with the mainboard?
Which hardware test app did you use to test the mics?
I tried a few, z-device test is one. (it only tests the lower mic).
nickone said:
I tried a few, z-device test is one. (it only tests the lower mic).
Click to expand...
Click to collapse
Nothing wrong with my mics, but that app doesn't show much at all for the mic test either, have to shout really loudly constantly for about 10 seconds for it to show anything at all
Which other apps did you try?
Hello,
I have seen a few people with an issue where if the phone gets wet, audio completely stops, and apps that use the speakers or microphone act very odd. https://forum.xda-developers.com/nexus-6p/help/nexus-6p-audio-playback-error-app-t3476592 this is one of a few posts with the same issue.
Essentially audio won't won't through anything but Bluetooth, and apps like YouTube, Play Music, Sound Recorder, Video Recorder (but not camera as is doesn't use the microphone) all act strangely, and different from each other. Play Music for example constantly loads songs then skips to the next. The Camera works great, but as soon as it is switched to video, it says "cannot connect to camera."
I'm trying to figure out why this happens, and how to fix it. Some have said that cleaning the microphone works, but that doesn't seem to help most, and didn't work in my case. The microphone is not replaceable on the board. Actually there are three, but the "main" one on the back seems to be the common issue, but may not be.
Any advice would be greatly appreciated. Thank you!!
My uneducated guess would be moisture in the connections causing circuit shorts when enabled. If you arent feeding anything to the speakers or from the mic, the connections dont short out because there is nothing doing.
After having the 6P apart twice, the best guess for a fix I would have is to disassemble it and disconnect anything that has a ribbon cable. You can disconnect the front facing camera, bottom speaker, etc. Then let the whole thing dry out and reassemble. NOTE: disassembling this phone is not for the faint of heart! I did it to replace my battery and ended up cracking the LCD panel in the process.
chrisexv6 said:
My uneducated guess would be moisture in the connections causing circuit shorts when enabled. If you arent feeding anything to the speakers or from the mic, the connections dont short out because there is nothing doing.
After having the 6P apart twice, the best guess for a fix I would have is to disassemble it and disconnect anything that has a ribbon cable. You can disconnect the front facing camera, bottom speaker, etc. Then let the whole thing dry out and reassemble. NOTE: disassembling this phone is not for the faint of heart! I did it to replace my battery and ended up cracking the LCD panel in the process.
Click to expand...
Click to collapse
I actually have the phone apart. I've cleaned all the corrosion off of everything with 90% isopropyl alcohol. The phone wouldn't turn on when I got it, now everything but the weird sound issue works great. It's been disassembled for weeks and is definitely dry, so no short circuit. At this point, I don't think the phone can be saved, but maybe. Plus, I'm super curious about why this is happening.
As written here:
Hi guys, I think I solved the problem.
After a factory reset, my phone didn't play any sound from the speakers (neither the top nor the bottom), couldn't record anything from the mic, couldn't record any type of video with the stock Google camera ("Can't connect to the camera" or 0:00 seconds long videos) and YouTube acted weird sometimes.
I spent to days looking for a solution, and I understood that the problem was in the headphone jack. It remains triggered as if there were headphones inserted, someone resolved inserting and removing a real device in the headphone jack 3 or 4 times, but it was not my case.
I took the phone apart, physically disconnected the headphone jack and then rebooted the device. All the problems are gone! The sounds came back perfectly from both speakers, the camera can now record video and the mic is working. After this test I turned off the phone, reconnected the headphone jack, rebooted and still no problems. The headphone jack works fine too, and YouTube has no problems reproducing videos.
I even tried two factory reset and everything is still working fine! I hope to be helpful to someone, this procedure has solved my problem!