I have a Xenon which is connected to a computer via a FTDI cable. (TTL - RS232 - 3.3V). The cable is connected to GND, TX and RX on the Xenon. Its VCC wire is not connected to the Xenon or anything else.
Sometimes, if I recycle power the Xenon, the tiny led flashes on it once but the Xenon never powers up. In this case, the only way for the Xenon to start is to unplug the FTDI cable from the computer then power the Xenon.
I appreciate the commuintiy’s input into what may be causing this?