I just received an Arduino ATmega2560 (GEEKCREIT). The 5V interface is giving exactly 5V as expected.
But on the 3.3V interface I could only measure 0.23V. What could be wrong?
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The first thing to verify is the 3v3 regulator, you could start measuring voltages at the IC6 pins (3v3 regulator). Connect the negative probe of a multimeter to ground. Put the positive (red) probe in the IC6 pins. There should read 0V at pin 2, 5V at pin 1 and pin 3, and 3v3 at pin 5.