reading 3.3V on 5V pins [SOLVED]

Greetings;

I have 2 Arduino Mega 2560 boards. Both Measure out at 3.3V on the 3.3v pin AND the 5V pin. Regardless of whether I connect a 12V supply or I run it off the USB port.

I stripped all peripherals off the board, no change.

Any ideas, what could be wrong?

Cheers

Ok, a bit more trouble shooting shows that both boards are stuffed with a 3.3V AMS1117, instead of a 5.0!!!

Until I can replace the chip, can o supply it externally with 5V, via Vin?

Cheers.

trilife:
Until I can replace the chip, can o supply it externally with 5V, via Vin?

Cheers.

Turns out that is not possible. The VIN connects to the input side of the Regulator. So I'm still stuck with 3.3V.

Found an old Arduino Uno, which had the 5.0 reg on it and swapped them out. All good.