This may happen on some M4 based Feather's when used with the Rev A version of the RGB Matrix FeatherWing that has a 100K pull up resistor on the enable (EN) pin. It can be solved by either replacing the 100K resistor with or adding a 10K resistor on top of it. You can even use a through hole resistor if you want.
This guide was first published on Aug 22, 2018. It was last updated on Aug 22, 2018.
This page (Troubleshooting) was last updated on Apr 12, 2021.
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