Ultra High Pitched Whine

So my 29H has recently developed this super ultra high pitched tone thats driving my insane and giving me headaches. It seems to start when the machine is warmed up. I guess my question is if anyone else has had this, and if they were able to figure out what part was causing it?

I can't hear it when I put my ear up to it, it's just *there*...

 

Inverter for the ccf backlight is my guess



Alex

 

Just kidding i couldn't resist.

I think you must search it in a voltage regulator circuit, mostly a condenser that is going down, and the circuitry is out balance
I think it will come faster, and at the end do it all the time

I can't explain well in English (i am dutch), but you hear it frequently in bad designed switched adapters.

 

You sure it's not just your wife or girlfriend?

 

Yup, that sounds like thats it. When I flex my screen I can hear it change. I'll see if I have a spare at home, I might.

I thought that for a while, till she told me she could hear it... Her high pitched is a bit different than this one.

 

Sorry, didn't mean to be non-value-added to this post, but couldn't resist. I had a similar issue on a shuttle. It turned out to be resistors. People just put glue on them and it shut them up. (Not recommend action for your wife however)

 

That depends on WHERE one applies the glue, and how GOOD that glue is... :wink:

Of course, Duct tape works as well, and is also useful to wrap around your head after she hits you with that skillet you bought her for an anniversary present.

mnem<~~~ 411 Dwagon ~~~<<<

 

Yes, ever since I installed Windows 7 on my CF-52, the high pitched electronic hum has gotten bad. It gets milder when the processor is active, but at idle the noise is a dominant feature on a pretty quiet laptop. I applied Panasonic's suggestion through power management, where they stated...

"If high-frequency sound occurs around keyboard while using the computer, check the settings for the USB power saving function."
In power management....
---Double-click the displayed [USB selective suspend setting].
--- Change settings of [On battery] and [Plugged in] to [Enabled].
---G Click [OK] and exit the [Advanced settings] screen."
"

This was the default setting, so it is already applied. So, I consider the described fix to not work (for me).

 

That is usually indicative of a failing inverter

 

I had the same high pitched sound coming from my CF-19 when I installed Ubuntu 9.10. (only when running on battery)
When I had Windows 7 installed there where no sounds.

After a bit of searching I found out that the sound is caused by some CPU power saving levels. In Ubuntu you can limit the power saving levels that are being used, so my Toughbook is silent now!
Don't know how you should change this in MS Windows...

 

I had a issue like this. It was on a asus laptop. The power plug had a loose center post. Made a very high pitch whine.

 

My CF30Mk2 did this for awhile as well. It would change tones when you adjusted the brightness level. It has since gone away with W7. I do remember reading something about the power ssettings having something to do with it. I guess I just got lucky and picked the right one.

Try changing the power settings around a bit and see if that helps.

 

Now THAT was funny!

 

I have a whine in my 29 that comes from the speaker. If the processor or HD are doing anything it goes away but If its idle it comes back

 

The last owner did not care for it and it afraid that you are going to leave it on it own.

It now need know that you are going to love it and use it.

 

Poor, deprived Toughbook...

mnem
*Whimper*

 

Please help give me a few trouble shooting tips, the noise is a huge negative. The electronic hum is not present in BIOS, Windows 7 Safe Mode, or on the old operating system. All Panasonic drivers, all peripherals removed, and the hum comes from keyboard area.
CF52 MKII, customer installed Win7+Panasonic support kit drivers.