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


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