L-Connect 3

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LCD not showing in L3 Debug

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Case: The fans are detected in Device Manager, but the corresponding control interface does not appear in L-Connect 3.

1.1 Please reinstall the latest version of L-Connect 3.
If you have already uninstalled and reinstalled the software but the issue persists

1.2 Disconnect the fan’s USB cable, clear USB device history , shut down your PC, reconnect the USB cable, and then power on the system (detailed steps below):

Download Cleanup tool: https://www.uwe-sieber.de/misc_tools_e.html

Right-click and run as administrator

Navigate to the “Devices” tab – select all – click “Remove selected”

1.3 At this stage, most users should be able to resolve the issue.


If the problem still exists, open Device Manager and manually uninstall the LCD device to allow the system to rescan the USB hardware (detailed instructions below). This step helps rule out any USB path conflicts that might prevent L-Connect 3 from initializing the device properly.

Right-click the Windows Start menu to open Device Manager

Under “Universal Serial Bus controllers,” locate the LCD device, right-click and uninstall.

1.4 Open the Windows Control Panel, go to Power Options – System Settings, and disable Fast Startup. This ensures the USB device is fully shut down during power off, allowing its complete reinitialization on reboot.

1.5 Power off the system, unplug the power supply, and wait until there’s no residual power. Then power on again to allow the USB device to be freshly recognized.

Fully shut down and disconnect power to ensure a complete reset

L-Connect 3 appears a blue screen or cannot execute.

Please install Microsoft Visual C++ Redistributable to enhance compatibility for L-Connect 3 with Windows.

For a newly installed Windows operating system or a reinstalled Windows system,
please ensure to install the Microsoft VC_redist package before installing L-Connect 3.
For a Windows 32-bit operating system, only the VC_redist X86 package needs to be installed.
For a Windows 64-bit operating system, both the VC_redist X86 and VC_redist X64 packages need to be installed.

Can't succesfully sync RGB to motherboard, I have installed a third party software, ex. SignalRGB...

Third party software is conflict to L-Connect 3, which cause uncontrollable issue. Please remove third party software to control with L-Connect 3.

Automation update failed.

If firmware update failed, please try update manually.
Guide for manual update firmware.

How to turn off all the LEDs?

Two ways to turn off:

  1. Set brightness to 0%.
  2. Set as black color.