would a full 6V (+) have a chance of harming the TPD?
Okay - I linked to what I could read of the data sheet above. Is that chip fully connected even when USB_HOST is not used - I suspect it is with both VIN and GND? but my reading of the schematic wouldn't help confirm that.If you look at page 4 of the TDP3S014 datasheet, you'll see the absolute max spec is 6V and the recommended max is 5.5V.
6V is printed on the cards, so there is no big problem. I'll print "Vin MAX 5.5V" to my 3.6 boards now, since they take 5V from the VIN Pin.