About the development board LEDs
ConnectCore for i.MX51 Hardware Reference Manual
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LEDs
WLAN, LE12
LED indicating WLAN operational status.
Power LEDs, LE3, LE4, LE6 and LE7
All power LEDs are red. The power supplies must be present:
n LE3 ON indicates that +9VDC / +30VDC power is present
n LE4 ON indicates that battery power is present
n LE6 ON indicates that +5VDC power for the development board is present
n LE7 ON indicates that +3.3VDC power for the development board is present