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Hi,

I have question about LED diode, namely when i put in my USB cable to the MD, LED don't shine, it is ok? I don't know does it shine or not. Can I have any mistakes in my PCB?

Thanks.

It only flashes when there is MIDI activity.

It is good information for me. I place this that:

If the LED doesn't work in one direction, reverse it. There is no danger in connecting the LED incorrectly, no danger to the LED or any other part.