26-04-2017, 00:19
(26-04-2017, 00:00)clubjoker Wrote: I was careful to remove the relevant diode on the Meduino before I soldered it onto the RX+ PCB and powered it up.
I'm glad to know it. So we can discard the biggest concern: a problem with the 74AHC244 chip.
Try to power the unit through a regulated 9V power supply, If I correctly remember, one user from AU have reported exactly the same problem (3.3V regulator running very hot) and he solved it by changing the mains power supply.
Discarding any problem with the 74AHC244, most probably the issue with the display is due to the length of the cable. Try to make it shorter, and please report back the results.