Steren HER-435 Manual Del Usuario página 23

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If some LEDs both the "Master" unit and the "Remote" are turn
off means that the corresponding pins are not connected.
Tests examples:
HDMI (A) – HDMI (A) are not connected the 2, 5, 8 and 11 pins.
HDMI (A) – Mini HDMI (C) are not connected the 1, 4, 7 and 10 pins.
Mini HDMI (C) – Mini HDMI (C) are not connected the 1, 4, 7 and 10 pins.
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