After about a week of usage (no problems at all), a very high pitch tone is now heard whenever the display is on. If the display is turned off, everything is nice and silent.
This tone is (pure guess here) about 10-12.000 hertz and very annoying since you are holding the phone to your ear during calls. It can be heard from about 5 meters away in a silent room.
It does not matter if the sound volume is off, on vibrate or on. It does not matter if the display backlight is on or off or what level the light is at. A hard-reset didn't do anything either. It also does not matter if WiFi, Bluetooth of the phone radio is on or off.
Any guesses? Should I just return it for repairs or does someone have a fix?
Best regards,
- Soren
It is usually the backlight lamp emits this buzz on some PPC...
But u mention you hear this even the backlight is off...
That's weird... but u need to exchange it back ..looks like HW issue to me
Hi Soren,
Definatly a hardware issue - I'd send it back for repair.
It sounds like the PWM (pulse width modulator) circuit has gone funny. This circuit produces the required -10v or so the display requires from the +3v battery. It's quite common to hear a very low buz at the frequency you mention on most phones.
Gav
Related
Hi guys,
I've found a very interesting sound effect on my O2 XDA Mini (=Magician). I've been having the phone for a few days only, but right from the very first calls I noticed that the speaker creates a very high frequency continuous beep-sound, not loud of course, but crazy high, something like the well-known side effect of the old CRT TVs. At first I thought it is produced during a conversation. Then today, I held my phone to my ears without any calls, and guess what: the beep is there. :shock: It's produced always!
I started to look around, and had a hunch that the LCD backlight can be the problem. I played a little with the backlight setting and found that I was right, the sound is poduced only when the light is set to low. It's loudest at the first notch of the light slider, and gets more and more quiet as you set the backlight higher.
Now I wonder if it's a special problem with my phone (like some bad quality filtering somewhere in the power electronics of the backlight system) or if it is the same with your devices.
Please try it and post your comments. Listen closely! And try both ears (not kidding), the sound is very quiet and very high in frequency, so your ears may not be up to the task to pick it.
Have to be honest I can't get a quite second at the moment but I'm pretty sure I've noticed this noise before as well. Another noise which can be irritating is the GSM radio module and it's intermitting buzzing (a quiet version of what you hear when unshielded speakers pick up your signal).
So basically I'm not sure but I think it's a generic issue with the backlight
Hi,
I found that too....
it's quite irritating as it looks like an old TV turned on.
I hope that won't be a problem to our ear in the future
Hi, i hear some beep sound, when change the brihtness on wm6. It is not pleasure voice, same as my old tv. It is hardware or software problem ? It can be remove in custom rom?
The beeping is caused by the dc-dc converter powering the LCD's backlight. There's nothing that can be done to alleviate the noise except turn the brightness (and therefore also the power through the converter) down.
i have a tmobile wing it seems that when the screen is on, theres a loud high pitched noise and a rough buzzing coming through the earpiece. but when i shut the screen off and the phone is running, no more noise. the time i really use the earpiece is when im actually on the phone talking. is there an program or something that can shut the screen off automatically when im connected on a call? that would be cool. thanks for reading
homescreen plus plus (battery meter)
tmobile wing settings
omapscaler: min:97mhz normal:201mhz max:201mhz boost:247mhz
omapapp: phone: 247mhz
It's the interference between the processor frequency and the lcd screen. It's not actually coming from your earpiece... it's the whole screen while it's on. It gets worse if you set homescreen plus plus to a dynamic processor speed... Under 200mhz it becomes louder and much more audable. At 247 you should just have the high pitch tone. No way to get rid of it. Except do like I do, press the power button and turn off the screen everytime you have a conversation using the earpiece. Just letting u know, it's not only you that the phone makes that sound. On my 2nd wing (herald) because of it before I realized it's simply a design flaw. They all do that. Old folks won't mind because they can't hear the high pitch... I've experimented lol
Hi guys, I had been playing with my nexus for around a week. Everything are very smooth and overall I'm satisfied with it, but there're 2 things that have been bugging me for a while.
First is the automatic brightness, if I put me device in the well lit area the screen bright up which is normal. But then if I bring it back to dark room it just stay there with the very high brightness and doesn't go down. I need to turn the screen off then on or toggle the auto brightness checkbox to make it back to normal. Is it normal behavior?
Second is the headphone jack, if I plug my phone's headset in (the one with built-in mic and a button to answer the call), the sound from my headset is very weird. It likes you ripped off the vocal and the bass from it, but if I hold the answer button it is normal again until I release it. I tried both headset from Xperia Neo and Nokia C3, it still the same. But this isn't happen with a headphone without mic, it works fine.
So I wanna ask if anyone have the same problems as mine and found a way to fix it.
Thanks for reading.
Sent from my Nexus 7 using Tapatalk 2
skyline159 said:
Hi guys, I had been playing with my nexus for around a week. Everything are very smooth and overall I'm satisfied with it, but there're 2 things that have been bugging me for a while.
First is the automatic brightness, if I put me device in the well lit area the screen bright up which is normal. But then if I bring it back to dark room it just stay there with the very high brightness and doesn't go down. I need to turn the screen off then on or toggle the auto brightness checkbox to make it back to normal. Is it normal behavior?
Second is the headphone jack, if I plug my phone's headset in (the one with built-in mic and a button to answer the call), the sound from my headset is very weird. It likes you ripped off the vocal and the bass from it, but if I hold the answer button it is normal again until I release it. I tried both headset from Xperia Neo and Nokia C3, it still the same. But this isn't happen with a headphone without mic, it works fine.
So I wanna ask if anyone have the same problems as mine and found a way to fix it.
Thanks for reading.
Sent from my Nexus 7 using Tapatalk 2
Click to expand...
Click to collapse
Automatic brightness is clearly a software issue. I think they only increase the brightness in this setting, never decrease (unless you turn off the screen or change brightness settings). This is done to avoid screen flicker (brightness keeps going up and down when the amount of light falling on the sensor changes). This may happen a lot due to your own shadow.
CyanogenMod roms have an option to Allow brightness to decrease when setting brightness to automatic. This will be the solution to the problem.
The headphones may have different hardware setting (positions of Left / Right / Mic) on the 3.5mm jack. You can try by inserting the jack in the port not full but partially (keep some part in the air). I am talking about the 3 rings you see on the metal jack.
Some have it as Left/Right/Mic and some have it as Mic/Left/Right. Headphones without Mic will only have Left/Right and have last spot empty i.e. only 2 rings.
So try inserting headphone only 2 rings in. That may work.
smhtc said:
Automatic brightness is clearly a software issue. I think they only increase the brightness in this setting, never decrease (unless you turn off the screen or change brightness settings). This is done to avoid screen flicker (brightness keeps going up and down when the amount of light falling on the sensor changes). This may happen a lot due to your own shadow.
CyanogenMod roms have an option to Allow brightness to decrease when setting brightness to automatic. This will be the solution to the problem.
The headphones may have different hardware setting (positions of Left / Right / Mic) on the 3.5mm jack. You can try by inserting the jack in the port not full but partially (keep some part in the air). I am talking about the 3 rings you see on the metal jack.
Some have it as Left/Right/Mic and some have it as Mic/Left/Right. Headphones without Mic will only have Left/Right and have last spot empty i.e. only 2 rings.
So try inserting headphone only 2 rings in. That may work.
Click to expand...
Click to collapse
I have tried CM10 before and it still have the same problem but I didn't dig into the advanced auto brightness option so I missed the "Allow brightness to decrease" setting you said. Now I'm using stock rom so I will take a look into that when I flash CM10 later.
About the headphone jack, you're right. Look like the mic and the ground pin are reverse in my headset and the nexus 7's jack. That's why when I press the button, the mic pin is connected to the ground so I can hear normal sound. Plug it in halfway doesn't work so I think I should find a new headphone without mic.
Anyway, thanks for your answer, it helped me a lot :good:
I have recently purchased a Verizon Galaxy S4 and love it. Initially I planned on loading a custom ROM but now that it is rooted and I have removed much of the bloatware, I realize I don't want to give up most of these Touchwiz features. However, there are two simple issues I have never had with an android device before that are bugging me.
First of all, as I'm sure many of you have noticed, when the battery reaches a certain level, the brightness dims to the lowest level possible and you lose the ability to manipulate the brightness. Generally this happens when my phone has at least a couple hours of battery life remaining. Granted, a bright screen will reduce this time but I'd rather have some usable time than none, as the brightness level reaches a point where the phone is completely unusable if you are exposed to any sunlight at all. I have tried going through the settings as well as overriding the brightness with an app I have called Screen Dim to no avail. Has anyone had success brightening the screen at low battery?
Additionally, every time you plug in a 3.5mm stereo jack into the phone, it drops down the volume and usually forces you to acknowledge a dialog box prior to permitting you to raise the volume. This is a wonderful feature if you are completely oblivious and all you ever use are low impedance headphones. However, I use this almost exclusively on loudspeaker stereos, 90% of the time it is my car stereo while I am driving. Occasionally I use bluetooth headphones but I'm not dumb enough to blast that on full volume so this feature is pointless to me. So now here is one more button I have to read and push while in the act of driving in order to get music playing which is unsafe. Is there any way to circumvent this annoyance?