8x8 LED matrix, one column not working?

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Gordon

Can you try removing disp.intensity(0); ? I guess that could be doing something strange.

Also, you're sure that the GND pin is connected?

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Hapseleg in reply to @Gordon

Removing the intensity didn't help and it works just the same with ground connected or disconnected.
Can I somehow check if the ground on the LED matrix is broke? I think I remember that all columns used to work

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