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| p.1 #2 · Effects of wear on CLK pinout of E-TTL hotshoe? |
All the pins are required for the data to go through between flash and camera, so a broken contact on any pin will disable all ETTL functions.
If the X pin is still working, the flash will still fire although with ETTL not working there won't be any metering info and power adjustment, so it will act like a "dumb" flash.