A2141 820-01700-A MacBook Pro 16” with missing USB data

sekidata

Member
This 820-01700 board arrived with a single misbehaving USB-C port. I found a shorted CD3215, which I replaced with a location-matched chip from a donor board. Now all 4 ports charge the battery and power external USB drives but don’t allow for any data transfer.

External drives are recognized on startup, before the drivers are loaded. I also get periodic kernel panics which trace to iokit.IOUSBHostFamily.

I’m familiar with this exact issue from the older A1708 model, where a bad USB redriver chip was to blame. How do I troubleshoot it in this model?
 

sekidata

Member
After performing a DFU Restore, I'm now seeing a short to ground on PPBUS_HS_CPU. Looks like the CPU shorted out for good - the USB issue was probably a pre-failure symptom. Goodbye board.
 
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