As I mentioned earlier I am getting low power warnings with a 5V adapter, and have now obtained another one that says 5.6V. Am wondering if this might work, or if it will damage the Pi and/or the touchscreen. Google gives conflicting information. Either the Pi will not survive more than 5.25V, or it will run happily on up to 7.5V.
Is there an authoritative explanation of the power requirements of the combined Pi 3 and official touchscreen?