Hi,
I just bought a Raspberry 3B+ and now I am setting it up.
Nice little box and it's really fast in comparison to my other RPis like Zero/W, A, B... It's fun to work with it.
But, besides this, one thing makes me really wonder:
Upper right on the screen there appears a yellow flash all the time and one of the boot messages reads something like "undervoltage detected".
The new box is working fine, though, but I connected a USB voltage measuring device and saw that the power input on micro USB connector of RPi3 never goes under 5.01 Volts, but, the USB power on those 4 USB port (I only checked 2 of them with identical results) is only 4,55V (!).
Total input current is at 0.6 A in average, so I doubt that the 5V/2A power supply is too weak.
Am I doing something wrong?
Best regards,
Markus