Realtek HD Audio: no sound after Windows update

"Suddenly there's no sound" — usually after a Windows update, a driver change, or a feature upgrade. With Realtek codec chips this is one of the most common Windows issues. Cause: Realtek's UAD/HDA architecture conflict, Windows Audio service problems, or a corrupted driver. We walk through fixes in order from least to most invasive.

Step 0: check the obvious

Before driver work, check the basics — you'd be surprised how often it's one of these:

• Volume — both Windows volume mixer AND speaker volume
• Right output device selected (speakers, not HDMI/Bluetooth)
• Cable connected — check the audio jack
• Audio profile — sometimes Realtek detects a wrong profile (e.g. "Front Speaker Out" vs "Headphones")
• Mute button on keyboard or speaker accidentally pressed

Driver solutions in order of severity

Solution 1: Audio Troubleshooter

Often the simplest fix.

1. Settings → System → Troubleshoot → Other troubleshooters
2. "Playing Audio" → Run
3. Follow the wizard's instructions

The troubleshooter sometimes detects driver/service issues you'd otherwise miss.

Solution 2: Restart Windows audio service

Open cmd as administrator:

net stop AudioSrv
net start AudioSrv
net stop AudioEndpointBuilder
net start AudioEndpointBuilder

If sound returns: a service hung. Possible long-term causes: too many parallel audio streams from apps, or a buggy app driver.

Solution 3: Roll back the driver

1. Device Manager → Sound, video and game controllers → Realtek device → Properties
2. Driver tab → Roll back driver
3. If greyed out: Windows didn't keep the previous driver. Then: Solution 4.

Solution 4: Resolve UAD vs HDA conflict

Realtek has two driver architectures (Universal Audio Driver and HD Audio). Conflicts between them are a common cause of "no sound".

1. Uninstall ALL Realtek audio drivers:
   • Device Manager → Sound → Realtek device → uninstall (also "Delete the driver software for this device")
   • Apps → Installed apps → search "Realtek" → uninstall everything
2. Reboot. Windows installs a generic HD Audio driver.
3. Test: does sound work with the generic driver? If yes: confirmed Realtek-specific problem.
4. Now install ONLY the matching version:
   • Modern laptops/motherboards (2021+): UAD via the device manufacturer
   • Older systems: HDA from realtek.com

Solution 5: Clean Audio Driver Installation

For very stubborn cases:

1. Boot in Safe Mode
2. Uninstall ALL Realtek drivers (as in Solution 4)
3. Delete the Realtek folders: C:\Program Files\Realtek and C:\Program Files (x86)\Realtek
4. Clean registry entries via tools like CCleaner or manually (HKLM\SOFTWARE\Realtek)
5. Reboot in normal mode
6. Install Realtek driver from manufacturer (motherboard or laptop)

Solution 6: Reset Windows audio components

Last resort before reinstall:

sfc /scannow
DISM /Online /Cleanup-Image /RestoreHealth

The first command checks Windows system files; the second can repair core components — including audio components. Both run as administrator.

Prevent future "no sound" issues

• Don't change audio drivers blindly — only when there's a real reason
• Before Windows feature updates: backup audio driver (note version)
• Once UAD or HDA is running: stay on that branch — don't mix
• For business systems: control driver updates via Group Policy