Just out of curiosity, have you tried a USB mic? That might bypass whatever is causing the hum.
-----Original Message----- From: Peter van Houten [mailto:peter...@gmail.com] Sent: Tuesday, April 20, 2010 8:02 AM To: NT System Admin Issues Subject: Re: OT: HP/Compaq NC6120 laptop noise Thanks Daniel. The nc6120 does not have an internal mic but the noise is produced whether an external mic is plugged in or not. This is verified by using the sound recorder or running Skype. It is beginning to look like oscillation produced in the mic preamp section. I was hoping that someone else had seen something on this and could point me to a quick fix but it is looking like a laptop strip :-( -- Peter van Houten Daniel Rodriguez wrote the following: > Is this happening with the internal mic or an external mic when it is > plugged in? > > On Mon, Apr 19, 2010 at 7:00 PM, Peter van Houten <peter...@gmail.com > <mailto:peter...@gmail.com>> wrote: > > Hello all, > > We have recently upgraded several of these laptops at a client. The > machines are old but not too badly specified, so it was decided > to upgrade to the max. The RAM to 2GB, the disks to 320GB and the O/S to > Windows 7. The users were delighted and all was well...except for an > audio problem. > > It occurs when recording sound from the mic input. Skype can trigger the > situation and is the application that uncovered the problem. It is a > continuous, low-level, [approx.] 500Hz whine (groan?) It is not a > feedback problem :-) The user couldn't hear the noise but the > people on the other end of the conversation were complaining. The > problem doesn't occur when simply playing audio, so it hadn't been > noticed previously. > > First test was to check a laptop that had not been upgraded. That > returned exactly the same fault. After that, we booted from an Ubuntu CD > to rule out the O/S and drivers and the same problem occurred. So, it is > hardware related and before we open one and start testing for bad caps, > ground loops and crispy spiders, has anyone else seen this? > > I have searched endlessly and found one *similar* problem on the HP > forum with no resolution. I am an electrical engineer and equipped for > (and comfortable with) all manner of hardware down to smt but I am > getting too old for this! > > TIA > -- > Peter van Houten ~ Finally, powerful endpoint security that ISN'T a resource hog! ~ ~ <http://www.sunbeltsoftware.com/Business/VIPRE-Enterprise/> ~ ~ Finally, powerful endpoint security that ISN'T a resource hog! ~ ~ <http://www.sunbeltsoftware.com/Business/VIPRE-Enterprise/> ~
