05-22-2010 07:24 AM - last edited on 05-22-2010 07:39 AM by Agotthelf
I had this problem on W7 X64. Try this:
Press the "volume up" or "volume down" key (left side to the blue ThinkVantage key), and the sound from speaker comes back.
Pressing the "mute" key brings the problem back, and pressing it again doesn't get the sound back. But the "volume up" or "volume down" key helps.
Hope this helps.
moderator note: subject line adjusted
11-05-2010 09:00 AM
THANK YOU VERY MUCH!!!!!
Pressing the Volume UP or DOWN button next to ThinkVantage button WORKED!!!
My symptoms were:
T400 Win XP, internal speakers not working, audio jack works, driver seemed ok.
I verified hitting mute did bring problem back which was resolved again by hitting Volume UP or Down.
Thanks again TUCOW
09-13-2011 07:57 AM
Thanks a lot for your help. Now it works perfectly. The only difference on my laptop is that it works even after pressing and repressing the mute button. Perhaps the newest Bios version (1.20) fixed the described bug.
03-08-2015 08:45 PM - edited 03-08-2015 08:52 PM
Hi all, I have been reading this thread for a long time while trying to fix my T400s' sound and I discovered why mine wasn't working, so I wanted to share it with everybody here who's still interested in knowing.
My T400s has no sound from the speaker or audio jack, and static from the microphone. I have installed all supported operating systems: Windows 7, 32/64 bit operating systems, Windows XP, and Vista 32/64bits and tried all avaliable Conexant sound driver versions for each of them and the sound didn't come back. I also tried upgrading the bios to the latest version and since I have no warranty coverage anymore, I took out the speakers and tested them with a multimeter to make sure that it is not blown or melted.
Finally I decided to inspect even closer so I lifted away the black film near the audio jack and I discovered that the sound card is actually fried and full of what looked like "mold", sort of what a leaking battery looks like.
Here is a picture of the "mold" as I found it, you can see that the sound card corner's pins are hidden under a layer of 'mold'.
(sorry for poor quality, that's the best I could do with my cellphone camera)
Here is another picture of the sound card after I tried to gently wipe off the "mold" with isopropyl, you can see the sound card corner's connection pins are all missing.
Interestingly, the device is shown as working in the device manager.
So this is why my T400s has no sound from the speaker and audio jack. (and a broken microphone.) I now use an external 24bit USB audio sound card for playing/recording sound on this Thinkpad.
Hope you all found this helpful!