There is a Lenovo G500 motherboard which has disconnection problem and controller 401 overheats. I checked the controller in motherboard schematic. Later I realized IC I/O is burned.
In this video you’ll see how to troubleshoot and solve the problem.
Lenovo G500 Compal LA-9631P Motherboard repair
In this video you’ll see how to troubleshoot and solve the problem.
Lenovo G500 Compal LA-9631P Motherboard repair