Buzzing Noise

Message

mcooper · #1 Post by **mcooper** » Tue Dec 05, 2006 11:15 am

Hello,

I have owned this thinkpad T42 for quite an long time now and since day 1 the unit has always emitted a high pitch buzzing noise when running from the mains.

When the laptop is running from batteries the noise almost completely disappears. I have seen many other references to the problem on other thinkpad models and various ideas on how to eliminate it. However, after trying most of these I can say that none of them have any effect whatsoever (the things I tried include disabling USB controller power management and updated the bios etc).

Does anybody else who has a thinkpad with the same problem know of a fix or whether IBM/Lenovo will do anything about it?

Thanks

agarza · #2 Post by **agarza** » Tue Dec 05, 2006 1:12 pm

Could this be a BIOS issue? I own a T42p but I've never had the noise you describe it. My machine is quite quiet

christopher_wolf · #3 Post by **christopher_wolf** » Tue Dec 05, 2006 1:31 pm

I have never encountered it as a continuous buzzing off of mains; in that case, I would send it in for IBM/Lenovo to have a look at it. It really shouldn't be doing that.

zverg · #4 Post by **zverg** » Tue Dec 05, 2006 7:32 pm

Have you been able to isolate the source of the sound at all? If it is only buzzing when on mains, it could easily be the AC/DC converter (power brick) causing it. Without having a spare to test with, there isn't much of a way to test for that.

I think with my ear up against my power brick it does make a slight buzz/hum, but that is to be expected.

#5 Post by **tomh009** » Tue Dec 05, 2006 8:18 pm

zverg wrote:Have you been able to isolate the source of the sound at all? If it is only buzzing when on mains, it could easily be the AC/DC converter (power brick) causing it. Without having a spare to test with, there isn't much of a way to test for that.

I have one (elderly) power brick than makes a nasty high-pitched whining noise -- but only when there is no ThinkPad connected. I plug the cord into one of the ThinkPads, and the brick goes silent.

pinkzeppelin73 · #6 Post by **pinkzeppelin73** » Sat Dec 09, 2006 5:04 am

Hello,

I faced the same issue than you this morning (noise from the mains, silent when on battery) and solved it by modify the Power Scheme when using AC power : CPU Speed Adaptive.

Best Regards,
Olivier

mcooper · #7 Post by **mcooper** » Sat Dec 09, 2006 9:27 am

Hi,

Thanks for the reply

Yes I have tried virtually everything to eliminate the noise including changing the power management settings and so on. However, none of this has had any affect whatsoever.

mcooper · #8 Post by **mcooper** » Thu Mar 22, 2007 2:05 pm

Just to update people on this topic. I got in touch with IBM and they sent an engineer out (as I have the on site warranty).

The engineer replaced the main board and the problem has now been resolved.

Buzzing Noise

Buzzing Noise

update

Who is online