Hello, i recently had the same problem
I wrote a post about the Conexant audio fix, maybe it helps you.
Solved Windows 10 no sound SOLUTION (CONEXANT) - Windows 10 Forums

Regentix

Hello!

Recently i had the problem of having no sound at all after updating to windows 10. I figured that i wasn't the only one with this problem.

Solution:
1) Go to Computer Management >...

It show's an OK symbol

I found a solution to my problem, if you want to know the solution go to: Windows 10 no sound SOLUTION (CONEXANT) - Windows 10 Forums

Sony Corporation VAIO (N/A)
Sound Cards
NVIDIA High Definition Audio
Conexant SmartAudio HD

I found a solution to my problem, if you want to know the solution go to: Windows 10 no sound SOLUTION (CONEXANT) - Windows 10 Forums