To troubleshoot disconnected wires in a laptop's motherboard, follow these steps: 1) Identify the wires, 2) Power off the laptop and ground it to avoid static discharge. 3) Carefully reconnect the wires using tweezers or a non-conductive tool, ensuring each wire is securely seated. 4) Test the LCD display after reconnecting the wires, and if necessary, seek professional help. Handling wires inside a laptop requires precision and delicate handling, so seek professional help if unsure.