Support in other languages: 
Showing results for 
Search instead for 
Do you mean 
Welcome to the Lenovo Community

Welcome to the Forums!

Welcome to Lenovo's Peer-to-Peer Discussion Community!
Please note our guidelines. How to register and login and Community FAQs.
Shape the Future of PCs

Help Lenovo Shape the Future of PCs

Take the ownership survey. Share your ideas with our product team
Community Spotlight

Visit the Lenovo Blogs!

Check out the ThinkPad Time Machine
Visit the Community Spotlight Blog
Windows  10

Are you ready for Windows 10?

Get to know Windows 10
Visit the Windows 10 Support Center
What's DOS?
Posts: 1
Registered: ‎07-03-2010
Location: Calif
0 Kudos

Think Pad 390 not charging batteries

My 390 is not charging batteries. I tried several known good batteries.


The power supply in the computer 'sings', I can hear it switching. Computer runs OK.


My power adaptor puts out 16 volts, is that correct?


Lowering the DC input voltage to 14 volts and I do not hear the 'singing".....