4.93V is close enough to 5V for our purposes.
As far as the green tap LED not lighting up…So when you say you don’t have power to the LED, do you mean you don’t get around 1.8V on the round pad? Is pin 5 of the microcontroller soldered properly? From your photos I can see that R12 is not in the standing position, and it should read 1K ohms…please re-measure it. Make sure you are testing the correct resistor.
For now, please ignore the fact that the tap LED is not working and skip steps 2 and 3 in the troubleshooting guide and let me know what you find.
-Brach