yashsingh1/xdaforums huggingface dataset:
[Sony Xperia P, U, Sola, Go] hrashdan:
hello, i have a Sony xperia u phone and today it wouldn't charge , when i plug the charger on , i don't get any indication that its charging other than the small led on the right top of the phone turning red, the status bar won't change, now the phone is out of battery and its still not charging , it wont show the battery animation when connected to the charger while off like it used to,

its been on the charger for 4 hours now and it wont turn on

the charger is working (tried with differant phone)

now is it possible that the battery died?

and i noticed that on the top of the battery next to the connecters there is a red square , i remember it was white :confused: could it be a sign that the battery is dead? can someone check on there battery what color is it? "couldn't find a picture of it online "

thanks for your help
[Sony Xperia P, U, Sola, Go] nettle77:
if you have a multimeter you can see if battery has any charge (volts). look on the battery connector if it has + - signs.

should be around 3.7v, i think.

on my XGO i can't remove the battery, so there is the "hard reset" mode: press power and volume_up until the phone makes 3 vibrations

is there somethink like that on your phone?
[Sony Xperia P, U, Sola, Go] hrashdan:
i don't have a multimeter , and i don't know how to hard reset my phone unless its on
[Sony Xperia P, U, Sola, Go] dara007_168:
u use Sony official charger or not ?

---------- Post added at 01:54 PM ---------- Previous post was at 01:54 PM ----------

PS:try to use auto charger
[Sony Xperia P, U, Sola, Go] hrashdan:
yes, i do, i tried it on my other phone it worked

and i tried other chargers "not sony" on my mobile it didn't work either, but that charger worked for my phone earlier , so its either the phone or the battery
[Sony Xperia P, U, Sola, Go] dara007_168:
ur last hope is go to the store and buy the auto charge.
[Sony Xperia P, U, Sola, Go] hrashdan:
OK this was solved by a mobile technician who told me that the mobile had some water in it and it power shutdown :S, although i don't remember it touching water , he solved the issue and it wasn't the battery

thanks all for help

this thread is now closed :D
[Moto G General] helppme:
<<SOLVED>> The moto G Opamp is not very efficient. It struggles to go down to 2Ohm stable. This means average earbud type headphones rated at 16Ohms. will have hiss and other artifacts. Higher impedance headphones. 40-70Ohms have much better sq. Much above 70Ohms and I suspect the Moto G won't be powerful enough to drive them.... so, that's the sweet spot! :D

Hey,

Since I updated to kitkta4.4.2 I notice there is a significant background hiss listening with headphones.

As soon as you use an app that activates the audio jack the hiss kicks in, it is constant, not volume dependent. If you turn the volume down to zero, but the app keeps the sound output active the hiss remains.

when the app is closed, the hiss abruptly stops (presumably when the sound API deactivates the inbuilt opamp to save battery)

I'm about 90% sure this wasn't present under 4.3 or was far less noticeable.

I'm not being picky either, this is bad enough that it would make using the phone as a walkman at a low or moderate volume unpleasant. From experience I'd estimate the hiss at approx -20dB.. this is similar to the hiss you would hear from your average desktop PC fan at idle under your desk..

can anyone test this too, on 4.3 and 4.4.2?

Oh, and use earbud headphones or good closed cup ones. Open phones, unless you are somewhere very quiet won't give a good idea of the hiss..

thanks
[Moto G General] theArchitektas:
Can confirm this on 4.4.2, too bad I didn't see your post before updating, as I don't really remember how it was on 4.3 :/

You don't actually have to use earphones, it's noticeable through the speaker, too (well I'm in my room alone and I put my ear close to it). However, I wouldn't say it's very significant - when using earphones I can hear it when muted, on the 1st bar after mute; on the 2nd you can't really say if you hear it or is it your imagination; and on the 3rd bar it's unnoticeable.
[Moto G General] UnknownAX:
I can't notice any hiss in 4.3, even if I use a headphone amp. No clicking sounds either when the opamp turns on.
[Moto G General] helppme:
this is what I was worried about. I didnt notice any hiss before either, and I had it connected to a car stereo so would amplify the issue (if it was there).

maybe something did change in the audio settings/drivers then. I have already tried dissablying all the dsp stuff with no luck, still the hiss and click when the opamp switches on/off.

Maybe it was there before though, and it's bad luck with the phone, rather than the OS version.
[Moto G General] dhilluk:
I have got UK Retail 4.4.2 and I have tried to replicate this. I have tried YouTube, Spotify Play Music and TuneIn. I do not experience a hiss!
[Moto G General] helppme:
Under 4.3 to save battery I disabled apps I wasn't using, including the Audio Effects app, and google play. When you disable them it forces you to 'uninstall updates' which I didnt realise at the time, but I think may have been specific to the moto g, as you cannot redownload them from playstore, or update them.

Would someone be so kind as to upload the FULL apk of their google play and and Sound Effects, from their stock 4.4.2 build?

Im pretty sure this is down to the software API that activates the opamp. (as it is very distinct), it even happens when you activate audio by using the rocker to increase the ringtone volume!?!?!???

It sounds like listening to a really cheap mp3 player with a low S/N ratio...

** edit I mean 'Play Music' not 'google play'
[Moto G General] motg-gm:
Hi,

I actually just registered to say this was very much present on my moto g on android 4.3 and is still the same on KitKat. It definitely sounds like a cheap mp3 player. Does anyone know of a fix?

Thanks
[Moto G General] UnknownAX:
Now this is getting weird. I think I'll install the ota to see how mine behaves. The G's audio quality decent enough imo. Probably above Android smartphone average. But what I like the most is that it's 100% silent, regardless of the volume setting, headphones or the amp.

Having said that, I will still get a USB DAC solution for it, which luckily has native support on both stock ROMs.
[Moto G General] boe323:
Is there anyway to update the phone without wifi ?? ...my friend as unlimited data but no wifi and she really wants to update ?
[Moto G General] theArchitektas:
I don't see how this is on-topic, but of course, you can download the update either on Wi-Fi or mobile data.
[Moto G General] RickPinto:
I don't know what you mean with "hiss", but since I updated mine (today - uk), i have started to notice some "clicks" in musics, that i didn't have before.

I was using PlayerPro, turned off the equalizer, uninstalled and reinstalled it again, and it was solved.

Google music, had no issues.
[Moto G General] helppme:
by hiss, I mean hiss. It is probably around 18KHz, and is similar tot he sound of RF interference on a stereo (alsmost like the snow screen sound on a tv).

It is not volume dependent so it is defenitely downstream from the DAC, and must be the opamp or downsteram from the opamp in the phone. It is most likely from a poor ground some where in the audio path (assuming the opamp isn't awful, anyone know the chip?). It could be due to the single board set up of the Moto G mainboard design. I'm guessing here, but if the PCB has the audio channel close to any of the ground of power channels, this would explain my hiss. If it is built to tight tollerance, this could also explain why some people have it, others don't.

In laymans terms, I'm saying the audio signal is 'dirty. If anyone has every used a PC with crappy audio on the motherboard, they will know exactly what this problem is like. When no program is using the audio driver, the board puts the audio to 'sleep', when you open a program that uses that audio driver, the audio wakes up and you get some hiss, noise through the audio and pc speakers. This is exactly what I experience with my moto G.

if im honest, it's unlistenable, however I'm a bit of an audiophile so I can appreciate for most people they won't see it as a problem..
[Moto G General] superusr:
I found 4.3 to already be noisy with the hiss when using my earphones, which have a low attenuation and so even low volumes sound loud on them. To get around this problem I bought an attenuator which connects between the phone and the earphones. Then I set the phone audio to maximum, and reduced the volume using the attenuator. Setting the phone audio to loud means the hiss volume is low compared to the volume of the sound coming out of the phone.

This is the attenuator I use:

http://www.amazon.co.uk/dp/B008EWP07E
[Moto G General] helppme:
this is a possibility, but its not ideal... sadly this is looking like a hardware issue not a software one though as if it was software, I'd expect it to be upstream of the opamp. The fact your attenuator solution works, is more evidence this is a downstream issue :(. (as implification induced noise increases with the square of the volume (assuming a logarithmic volume scale))
[Moto G General] Ravinxx:
I'm on 4.4. I notice a slight hiss when music is coming out of the phones speaker, though its completely undetectable if the phone is at around half volume. No hiss when coming through headphones.
[Moto G General] helppme:
Please can you test something, with some sensitive in ear headphones (or in a quiet room if they are normal headphones.)

>Connect headphones to phone

>Make sure ALL apps are closed.

>turn the phones ring volume to zero

>you should hear silence.(regardless of what headphone volume is)

>On the home screen, Press the Up volume rocker 3 times quite quickly.

>On my phone, the headphones go from silent to Hiss, then I hear the 'Beep'.....'Beep' of the volume increase on top of the hiss. Wait 2 seconds after the second beep and you hear the Hiss abruptly stop, and you are back to silent.

I have this problem with all audio activity on the phone, but the ringtone volume trick is the easiest way to demonstrate it.
[Moto G General] coursemyhorse:
Or even easier, just press the volume down or up button once in any direction with headphones plugged in. Regardless of what it was set to and becomes set to, you will hear a faint background hum/hiss be emitted through the headphones for a second. This is fairly normal on any phone and even most audio devices. I don't know what you expect really in a smart phone that costs £129 in the UK. It is a compact environment to build so much electronics into and will never be a hifi device.

I tested with 3 phones on my desk right now and they all have a hiss when you first do something to make audio come through the headphones like quickly play and then pause a track. In fact, one phone (Samsung Galaxy Ace Plus) has not only a hiss, but a screech/high pitched whine as well. All of these "noises" that are detectable, become undetectable when volume of anything is turned up past the first or second bar anyway.
[Moto G General] helppme:
This is a fair point, and I agree is not surprising given the phones price. I think the reason I have posed this question was to a) determine if it could be software related (4.3 vs 4.4.2) but It doesn't looks so. b) Is it universal, or could be a slight lottery and maybe my phone is worse than others. As some people say they definitely have no issue. (granted it could be subjective)

Also, I would say, although it is present in most devices to some degree, it is noticeably worse on this phone than any other I have had. Multiple sony erricsons, galaxy Ace, Nokias.. And my last phone Galaxy S2 had extremely clean audio production. (i compared directly with moto g).

I do concede I am an audio snob though, so don't like listening to poor quality. I never really expected to use the moto g for music, but would have been a nice to have.
[Moto G General] theArchitektas:
Yeah, it seems to me too that you are a bit more on the audio than most people :D

By the way, I was wondering up to which levels can you really say that you hear the hiss? As I've said before, for me it's definite hiss when muted and 1st level, weird feeling on the 2nd and I can't hear it from the 3rd.
[Moto G General] helppme:
Depends on the music. pop music which has a lot of mids and highs, the hiss isnt noticible from notch 4 up maybe.

Quiet music, classical, R&B & hihop with a lot of bass beats but not many highs, you can hear the background his up to maybe 2 notches off max. But its acceptable from maybe half volume.

tbh it's more of a shame than an issue. I didn't expect this to replace a decent mp3 player, would just have been convenient is all.
[Moto G General] theArchitektas:
I'd still like some more people with 4.3 confirm/deny if the experience is the same, I guess not everyone can notice that (if this was indeed a thing after the update).
[Moto G General] ferossan:
Why don't you try different (and more brave) options testing other 4.4.2 roms? Currently Infusion Beta II works quite well and has the lastest DSP manager that could make a difference for you.
[Moto G General] angomy:
I tested this with a somewhat inexpensive set of headphones (Sony MDR-ZX600) on my Moto G (4.4.2) and my Samsung Note 10.1 (4.2.1) on a song with a soft piano intro. There's a definite soft hiss on the Moto G compared to absolute silence during that piano intro, but once the singing/beat starts I can't hear it. It's pretty faint so if I have the volume turned up more I can't hear the hiss over the music itself.

I had Jellybean for all of 5 minutes before my phone received the OTA so I can't say what it was like before. But to be honest, if I hadn't read this thread I would probably not really have noticed the hiss since it's so faint at least in my case.
[Moto G General] helppme:
Ok I've done some testing. This appears to be an impedance mismatching, Like having the wrong resistance speakers connected to an amplifier.

I tried connecting my Sennheiser HD 25s up to the moto G, guess what, almost ZERO hiss. I mean, no audible issue atttt all. The sennheisers are rated at 70Ohms.

My Sony earbuds that exhibited realllly badd hiss and are rated at 16Ohms. The opamp in the Moto G is clearly just not good enough to drive the 16Ohm headphones efficiently. Counter intuitive though that seems, this tells me the Moto G opamp is pretty inefficient and Poor.

Normally you want the headphone amp to be roughly 1/8th the Impedance of the headphones. A 2Ohm stable amp is not a problem usually, but clearly pushing the limits of whats in the moto g.

On the upside, it does seem to sound fine with my sennheisers, so not the end of the world...
[Moto G General] angomy:
Interesting. My Sonys are 40 ohms, I have a pair of Sennheiser HD555 which are either 50 or 120 ohms (they changed them sometime in mid 2000's, I don't know which ones I have) that I'll try to try out -- I have to find my 3.5mm adapter since they have 1/4" stereo jack. I'll report back when I do try it.
[Moto G General] helppme:
I have tried with 3 sets of 16ohm headphones. £35 quid sonys and a £22 quid set of ex71s and some super cheap jvc ones. All have the same bad hiss.

Tried with some 20ohm samsung buds. hiss, but not as bad, and My HD25s. virtually no audible hiss...

Be great to hear your results. This would explain why other people hear no hiss though. I'm fairly confident this is what's going on.
[Moto G General] angomy:
Well, to update again: I tried yet another pair of ear cans --- my noise-isolating buds (Shure SE110) which are 27 ohms and ..... absolutely zero hiss whatsoever at any volume.

So in terms of other specs that may be causing the hiss/no hiss difference:

Shure SE110

Frequency Response 22Hz-17.5kHz

Sensitivity 113.0 dB/mW

Impedance 27.0 Ohm

SONY MDR-ZX600

Frequency Response 6 - 25000 Hz

Sensitivity 104 dB/mW

Impedance 40 Ohm

I'm wondering if it's because the SONYs have a wider frequency response range (supposedly people can only hear 20-20k) that I can hear it on them, and not at all on the Shures?

I'll try again if I can find that dratted adapter, I normally have the Senns plugged into my digital piano so I never use them for anything else.
[Moto G General] helppme:
very curious. Indeed, the average person only hears to 20khz but young people and a lot of people on the bell curve can hear into the low/mid 20s, so yea it could be that the amp is struggling and the sony is presenting the high end noise. The other issue is that sony are notorious for mispresenting their specs. Sure and pretty good with their specs (so I've heard), Senn are usually bang on, since they are used for studio work and often with headphone amps they seem to make an effort to get their figures right.

The sensitivity is linked to the Ohms, so often the headphone manufacturer play with these figures, so yea they are connected, but ultimately what it comes down to, is whether the amp can power the headphones cleanly. Technicaly lower Ohms are better, provided the amp can go that low efficiently. Higher ohms are technically worse, but if the headphones are well matched to the amp then its not a problem.

this is clearly a headphone issue one way or other, or a headphone revealing a phone issue.. haha
[Moto G General] fixxxer667:
Confirmed on international (xt1032), German retail 4.3.

EQ effects always disabled.

Brainwavz Beta w/mic (16 Ohm) hiss audibly when doing the volume test (and perform less than admirably with music)

Sennheiser PX100-IIi (32 Ohm) no perceptible hiss, much better sq.

I have half a mind to try it with my HD 580s and see if it even manages :P

Anyway, in general, without the hiss, it's probably better than my HTC DHD (Ace) which has pretty horrible audio for a former flagship device. My sansa fuze runs circles around both with any headphone, but yeah, still adequate.
[Moto G General] AwesomeTurtle:
Same story here with my Yamaha EPH-100s (16 ohms), but at this point it's pretty much unanimous.
[Moto G General] rec71:
My AKG K452s exhibit no hiss. 32 Ohms.
[Moto G General] helppme:
[SOLVED]

CHeers guys. Loops like we have identified the issue with the audio. Good to know too, for anyone noticing this problem.

With the higher impedance headphones the phone actually sounds better than average. Certainly good enough for a £100 phone.

I changed the original Post to reflect this, maybe a mod can change the title to [SOLVED]
[Moto G General] AwesomeTurtle:
Side note, it certainly does sound cleaner/fuller when run through my Fiio E6 amp.
[Moto G General] fixxxer667:
Good idea. I have an E3 and E5 lying around somewhere.. will try the 16ohm and 32ohm phones and write back.
[Moto G General] UnknownAX:
Luckily someone figured this out. I've done some tests and can confirm it.

Meelectronics M9 (in-ear, 16 ohm)

Rather strong hiss, it can get annoying in quiet places.

Sennheiser PX-100 (on ear, 32 ohm)

Slight hiss, I doubt it would bother anyone.

DIY headphone amp ( 10k ohm) connected to Lasmex H-75 (40ohm)

No hiss at all, better audio quality.
[Moto G General] tonyleeloveyou:
I think that is a problem, mines too.
[Moto G General] AwesomeTurtle:
Background hiss has existed since the dinosaurs. The hiss you get here is no different than with most other portable devices (unless you start from the Fiio X3 up :) )
[Moto G General] akhilpo:
Can you turn off the audio effects in the Settings>Sound and test again. Please post back your results.

---------- Post added at 01:57 AM ---------- Previous post was at 01:32 AM ----------

Just ignore my previous post. I saw that you have already tried those. I was hoping to buy a Sound magic E10 for my moto g. In its product page it is mentioned that it has an impedance of 16ohms. So do you guys think I should go with that buy or save money buy a cheaper one considering E10 might won't give good audio quality with moto g.

I am not an audiophile. I have used a sound magic PL11 with my iPod touch and I have never noticed any hiss or anything. I have was hoping to have a good audio experience with moto g and SM E10 earphone.
[Moto G General] jaspreet997:
I only get a noticable hiss on dsp Manager ....otherwise its always silent and works perfectly
[Moto G General] bobseven:
Thanks for mentioning Audio Effects in Settings, I didn't even realize there is something turned on there by default, gives me horrible distortion on vocals when turned on. There is still very slight hiss with my 32 ohm in-ear phones but this isn't that bad. I thought my phone was ****ed but it was just Audio Effects :D

For what its worth I can't really hear that slight hiss at all with my big Sony headphones, those are 70 ohm I think.
[Moto G General] helppme:
the e10 impedence rating will be for it's own in built amplifier, it has nothing to do with its input level. As with any headphone amplifier, the 'usual' method is to set your input level (the phone volume) to about 2 thirds maximum, or higher if safe. This maximises the Signal to Noise ration going into you E10. You then use the E10 as an attenuator/amplifier to drive your headphones. Unless the E10 is also a DAC, but in that case you won't have the hiss from the phones headphone jack anyway..

I hope that made sense. Basically, the 16Ohm issue wont really apply if you are using an external headphone amp :D
[Moto G General] vNa5h:
what are u talking about.. my pl11 is rated at 12ohms...and i have no hiss sound..just confirmed it in quiet room
[Moto G General] helppme:
Without getting into a 'hypothetical debate' I'd strongly urge you to research the subject properly before commenting.

There are 2 possibilities. You have been lucky and have a pair of pl11 that work well with this phone, or (quite likely) your hearing range means you see no problem and hear no hiss. This is consistent with what a lot of others have reported on this thread.

However, if you look through the posts the vast majority that have checked have confirmed my conclusion.

With regards to the PL11, these are budget headphones with relatively poor quality controls. It is very likely that their printed specs differ greatly from they actual specs. Impedence ratings are often misrepresented to allow a manufacture to also list a wider or flatter frequency response. The PL11 would fall into this category.

Shure, Sennheiser, Sony even and some others generally provide accurate specificaitons, because their headphones are used for studio purposes where people would complain immediately if they were off.

I'm not saying you are wrong, what I'm saying is your sample of '1' doesn't mean much in this situation.

I hope you take my reply as it's intended :)
[Moto G General] ReaperXL2:
Hey Peeps :good:

Been following this post & just thought I would throw my experience so far in to the mix...

I have a GPE Moto G UK... I am running XenoAmp Beta (latest) alongside ViPERFX... My headphones are JVCKenwood XX (Xtreme Xplosives HA-MR77X) : http://xtreme.jvc.com/spec.html...

Frequency response is : 8-20,000Hz, Nominal Impedance is : 46ohms, Sensitivity is : 113 dB/1mW, Maximum Input Capability is : 1000mW(IEC)...

I have not heard & can not hear any audible hiss of any description when adjusting volumes or listening to audio, either with ViPERFX or without...

I have also tried XenoAmp native EQ & calibration tool without ViPERFX & again, experienced only clean audio without interference at any level...

Maybe this issue is related to the Motorola proprietary software installed along with the 4.4.2 retail release firmware...

GPE Edition Moto G's are completely free of all third party inclusions & may explain the lack of audio issues in my phone...

Just another facet that I think should be investigated...

Motorola DSP may be the Issue, or other Motorola derived software...

Anyway, I wish you all luck solving this issue... If I discover any solution for sufferers of the audio hiss, then I will be sure to inform you peeps asap :highfive:

ReaperXL2 :silly: