Why does a Windows laptop lose sound after an update?
Short answer: Realtek High Definition Audio is the most common audio chipset in laptops in India (HP Pavilion, Dell Inspiron, Lenovo IdeaPad, Asus VivoBook — virtually all budget and mid-range laptops use Realtek). When Windows Update installs a generic Microsoft High Definition Audio driver over the Realtek-specific driver, the speaker stops working. The Realtek-specific driver includes equaliser tuning, speaker amplifier settings, and microphone noise cancellation profiles configured by the OEM for your specific hardware. The generic driver lacks all of these — and sometimes produces no output at all.
How to fix — step by step
Step 1 — Confirm the Realtek driver is missing in Device Manager
Open Device Manager (right-click Start → Device Manager) and expand Sound, video and game controllers. If you see "High Definition Audio Device" instead of "Realtek High Definition Audio" or "Realtek(R) Audio", the generic Microsoft driver has replaced the Realtek-specific driver. This is your confirmation. Right-click "High Definition Audio Device" → Uninstall Device → check "Delete the driver software for this device" → OK. Restart the laptop. Do not let Windows automatically reinstall the driver on reboot — proceed to Step 2 immediately. Reinstalling from Device Manager will install the same generic driver again.
Step 2 — Download and install the OEM Realtek driver
Visit your laptop manufacturer's support page and search for your specific model:
- HP laptops: support.hp.com
- Dell laptops: dell.com/support
- Lenovo laptops: support.lenovo.com
- Asus laptops: asus.com/support
- Acer laptops: acer.com/support
Download the audio driver (it will be labelled Realtek Audio or Realtek HD Audio). Run the installer — it handles the full installation including uninstalling any conflicting generic driver. Restart when prompted. After reboot, Device Manager should show "Realtek(R) Audio" or "Realtek High Definition Audio" and speakers should work. See our Windows audio driver missing guide for additional scenarios including no microphone after driver reinstall.
Step 3 — Set the correct default audio device
Even after installing the correct Realtek driver, Windows may default to a different output device — particularly if the laptop was connected to an HDMI monitor or Bluetooth speaker at any point. Right-click the speaker icon in the system tray → Open Sound Settings → Output device. Ensure "Realtek(R) Audio" or "Speakers (Realtek Audio)" is selected, not "HDMI Output" or a Bluetooth device. Also click on the Realtek device name and check the volume slider — Windows sometimes sets device volume to zero independently of the master volume. In the Realtek Audio Manager (which appears in the system tray if the driver installed correctly), check that the output port matches where your speakers are plugged in. Particularly on HP laptops, the front headphone jack and internal speakers are separately configurable in Realtek Manager.
Step 4 — The India angle: Tally and Zoom audio conflicts
In India, a specific pattern causes the Realtek driver to appear installed and working but produce no sound: Tally ERP 9 and Tally Prime (widely used for accounting across India) sometimes capture the audio device exclusively and do not release it, preventing other applications from playing sound. Similarly, Zoom and Microsoft Teams can grab the Realtek audio device and not release it on close. The symptom: browser videos are silent, but the driver shows as installed correctly in Device Manager. Fix: completely close Tally or Zoom (check system tray for hidden icons), then test audio. If sound returns, the application was holding the device exclusively. In Zoom settings: Audio → uncheck "Optimize audio for meeting". In Tally: it does not use audio — if Tally is present and audio fails only with Tally running, check for Tally-related processes holding the audio session. Also see our related guide on Tally network errors for other Tally-related software issues.
When to call a laptop repair service
When DIY ends
Call a technician if: the OEM Realtek driver installs without errors but no sound output appears after setting the correct default device; the Realtek Audio Manager shows no connected devices even with speakers connected; or Windows Audio service (in services.msc) fails to start and shows an error. These suggest either a hardware fault in the audio circuitry or a corrupted Windows audio stack.
Typical repair cost in India
Driver reinstall and audio configuration: ₹500–₹1,000. If the audio hardware on the motherboard has failed (rare): chip-level audio IC repair or replacement: ₹1,500–₹4,000 depending on the laptop model. Speaker replacement (physical hardware): ₹600–₹2,000 from our laptop speaker service.
A note from the LRW Engineer Team
The single most common mistake when fixing Realtek audio: downloading the driver from Realtek's website (realtec.com). That version is the reference driver for Realtek's own hardware platform — it often conflicts with the OEM's customised audio path, making the problem worse. Always use the manufacturer's support page. Same model number, very different driver packages.