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Different CPU temp for power from microUSB or headers PINs

Moderators: chensy, FATechsupport

Hi,
we are experiencing a strange issue:
- if the NanoPi NEO board is powered by microUSB the temperature of the board stays around 70C
- if we connect the same power supply to the header pins, the temperature of the board goes up to 90C
Attached is a RRD graph we create reading the board temp from /sys/devices/virtual/thermal/thermal_zone0/temp
Powers.png
Powers.png (51.76 KiB) Viewed 1626 times


Any idea why ?
I would also like to know the reason behind this different temperature readings on two different methods of powering the nanopi.
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