How to Fix Logitech K780 Keyboard Not Pairing on Windows

Jul. 22, 2025 / Updated by Seraphina to Windows 10

fix-logitech-k780-keyboard-not-pairing

The Logitech K780 is a popular wireless Bluetooth keyboard that supports multi-device switching. However, some Windows users may encounter issues like "unable to pair" when attempting to connect the keyboard, affecting normal use.

This article will analyze the common causes and provide practical solutions to help you quickly resolve the pairing failure.

I. Causes of Logitech K780 Pairing Failure

Bluetooth is turned off or malfunctioning
The keyboard is not in pairing mode
Outdated or corrupted Bluetooth drivers
Windows Bluetooth services are not running
Device conflicts or cache errors
Compatibility issues with certain Windows versions

II. Solutions to Fix Logitech K780 Pairing Issues

1. Enter Pairing Mode on the Keyboard

Make sure the K780 is in the correct pairing state:

Turn on the keyboard.
Press and hold one of the "Easy-Switch" keys (F1/F2/F3) for 3 seconds until the Bluetooth indicator starts flashing rapidly.
Go to Windows Settings to connect.

enter-pairing-mode

If the Bluetooth light doesn't flash, the keyboard isn't in pairing mode. Restart the keyboard and try again.

2. Update the Bluetooth Driver

Bluetooth drivers are essential for device connectivity. If you're unfamiliar with manually updating drivers, consider using Driver Talent, a driver management tool that can automatically detect and fix missing or problematic drivers.

Download Driver Talent

Download and install the latest version of Driver Talent, then launch it and click "Scan".
After the scan, locate the Bluetooth driver in the results and click "Update".

driver-update

Restart your PC to ensure the new driver takes effect.

3. Check Windows Bluetooth Settings

Press Win + I to open Settings and go to Devices > Bluetooth & other devices.

Make sure Bluetooth is turned on.

Click "Add Bluetooth or other device", select "Bluetooth", and wait for K780 to appear, then pair.

check-windows-bluetooth-settings

If K780 doesn't show up, Bluetooth might not be functioning properly due to a driver or service issue.

4. Enable Windows Bluetooth Support Service

If Windows' Bluetooth service is disabled, your device won't be recognized.

Steps:

Press Win + R, type "services.msc", and hit Enter.

Find "Bluetooth Support Service", right-click and select "Start".

enable-windows-bluetooth-support-service

Double-click to open its properties and set the Startup type to "Automatic".

Try pairing the device again.

5. Clear Device Pairing Cache

Corrupted pairing data can also prevent successful connection.

How to fix:

Go to Settings > Bluetooth & other devices and remove any existing K780 device entries.
Restart your computer and attempt pairing again.

Alternatively, press Win + R, type "%windir%\System32\fsquirt.exe", and use the classic Bluetooth setup window to reconnect.

6. Try Using a USB Receiver

If your K780 also supports Logitech's Unifying Receiver, try pairing through Logitech Options software:

Download and install Logitech Options.
Plug in the USB receiver and launch the software.
Click "Add Devices" and select K780 to complete pairing.

This method can be a good alternative if Bluetooth is malfunctioning on your PC.

III. Frequently Asked Questions (FAQ)

Q1: My PC doesn't have Bluetooth. Can I still use the K780?

A: Yes, you can use a Logitech Unifying Receiver or a USB Bluetooth adapter for pairing.

Q2: K780 connects fine to other devices, but not on Windows?

A: The issue is likely due to system or driver problems. Try reinstalling the Bluetooth driver or removing old pairing records.

Q3: The keyboard pairs successfully, but keys don't work?

A: Make sure you've switched to the correct Easy-Switch channel, and check if the battery has sufficient charge.