Why Does CH340C Show 'Device Descriptor Request Failed' Error?

Why Does CH340C Show 'Device Descriptor Request Failed' Error?

The "Device Descriptor Request Failed" error is a common issue that occurs when using the CH340C USB-to-Serial converter chip. It can be frustrating, but understanding the root causes and following a step-by-step solution can help resolve the issue.

Possible Causes of the 'Device Descriptor Request Failed' Error

Driver Issues: The most common cause is an issue with the USB Drivers . If the Drivers are not installed correctly, outdated, or incompatible with your operating system, the device will fail to communicate properly with the system.

Faulty USB Cable or Port: A defective USB cable or an unreliable USB port can lead to poor communication between the device and the computer, causing the "Device Descriptor Request Failed" error.

Operating System Compatibility: Some versions of operating systems (especially Windows 10/11) may have compatibility issues with certain USB devices, including the CH340C chip, causing the descriptor request to fail.

Power Supply Issues: If the device connected via the CH340C is drawing more power than the USB port can supply, the communication might be interrupted, leading to this error.

Incorrect Device Connection: In some cases, the device might not be properly connected to the computer, or there might be a connection issue with the CH340C chip.

Corrupted or Missing System Files: If your computer has corrupted system files, especially related to USB controllers, it can affect the ability of the system to interact with the CH340C, causing the device descriptor request to fail.

How to Fix the 'Device Descriptor Request Failed' Error

Step 1: Check the USB Cable and Port Replace the USB cable: Sometimes a defective cable can cause connection issues. Try using a different, known-to-be-working cable. Try a different USB port: Plugging the device into another USB port can help. Sometimes USB ports on the front of the computer or hubs may not supply enough power. Step 2: Reinstall the CH340C Drivers Uninstall current drivers: Open "Device Manager" (press Win + X and select Device Manager) and find the CH340C device under "Ports (COM & LPT)". Right-click and select "Uninstall device." Download the latest drivers: Visit a trusted source like the manufacturer’s website or other trusted repositories to download the latest CH340C drivers. Install the drivers: After downloading, run the installation and follow the on-screen instructions. Restart your computer after installation. Step 3: Update Your Operating System Check for updates: Ensure your operating system is up to date. Windows updates or patches may address USB driver issues that could be causing the problem. Install necessary updates: Go to Settings > Update & Security and check for updates. Install any pending updates to ensure compatibility with hardware devices like the CH340C. Step 4: Power Supply Check Try a powered USB hub: If you’re connecting multiple devices or a device that requires more power, consider using a powered USB hub to ensure stable power supply. Connect directly to the computer: If using a USB hub, try connecting directly to the computer’s USB port to rule out power supply issues. Step 5: Check for Hardware Faults Inspect the CH340C device: Make sure the CH340C device is not physically damaged or defective. If possible, test it with a different computer or system to see if the issue persists. Try another computer: If you have access to another computer, try connecting the device there to see if the error continues. This helps determine whether the issue is with the device itself or your computer. Step 6: Fix Corrupted System Files Run System File Checker (SFC): Open Command Prompt as Administrator (right-click Start, select Command Prompt (Admin)). Type sfc /scannow and press Enter. This will scan and fix corrupted system files that could be affecting USB functionality. Run the DISM tool: In the same Command Prompt window, type DISM /Online /Cleanup-Image /RestoreHealth and press Enter. This tool will fix issues related to the system image and ensure everything is in working order. Step 7: Additional Troubleshooting Check for conflicts: In Device Manager, check for any yellow warning signs next to the USB device. This could indicate a driver or hardware conflict. Disable USB selective suspend: In Device Manager, under "Power Options", disable USB selective suspend to prevent the system from putting USB devices to sleep.

Final Thoughts

The "Device Descriptor Request Failed" error with the CH340C typically stems from driver issues, faulty hardware, or power supply problems. By following the troubleshooting steps outlined above, you can easily fix this issue and restore communication between your CH340C device and your computer. Be sure to keep your drivers up to date and check for any operating system updates regularly to avoid running into this issue in the future.