Revive your Lenovo Thinkpad X1 Carbon Gen 1 with the Lenovo USB Audio IO Board (Part Number: 55.4RQ03.021 04W3912). If your laptop’s USB ports or audio jacks are faulty or non-responsive, this genuine replacement part is the solution.
Compatibility:
- Compatible with Lenovo Thinkpad X1 Carbon Gen 1
- Part Number: 55.4RQ03.021 04W3912
Ensure your laptop’s USB and audio ports function flawlessly by replacing the IO board with this genuine Lenovo part. The board has been inspected and is in excellent working condition, ready to restore full functionality to your laptop.
Please note that this listing includes real photos of the Lenovo Thinkpad X1 Carbon Gen 1 USB Audio IO Board (Part Number: 55.4RQ03.021 04W3912). No installation instructions are provided. If you have any inquiries or require assistance, feel free to contact us. Renew your laptop’s capabilities with this authentic Lenovo replacement part.
Always ensure compatibility with your device before making a purchase. For further compatibility or technical queries, we’re here to help.

