On lots of Intel-based Macs that had four Thunderbolt ports, there was just one Thunderbolt bus controller For each and every set of ports. I even though that had changed with Apple Silicon Mac notebooks that experienced 3 Thunderbolt ports; that each port had its have bus controller. Dell is https://laptop-repair-in-jp-nagar36802.answerblogs.com/36589408/the-basic-principles-of-repair-iphones-near-me-jp-nagar