MIDIbox SID V2 ‘LFO POSITIVE LED’ never lights up

[Oli]

Hi, I'm currently building a MIDIbox SID V2 with the complete Control Surface. Everything works great, except for one thing. The additional ‘LFO POSITIVE LED’ never lights up. I can rule out errors on the hardware side, as I have already assigned ‘TMP5, 5,’ to other DOUTs and the LED does not light up then either. However, other functions are displayed on the outputs without any problems. I have of course already changed the LFO DEPTH and RATE. With positive LFO waveforms, for example, Random + Sine lights up, as described in the manual.

Can anyone tell me what the problem might be or does something else need to be changed in the code?
Thanks!

[Smithy]

Have you used the diode test function with your multimeter to see if the LED illuminates?

First thing I would check is if the anode and cathode are in the correct holes or if the LED is dead. 

Edited 4 hours ago by Smithy

[Oli]

Many thanks for the quick reply.

Yes, I sent another function to this LED as a test and it then worked without any problems. So I can actually rule out everything on the hardware side.

Unfortunately, I can't find many SIDs where the LED is used. I also couldn't find any videos on YouTube where someone has installed this LED and you can see it in use.

In my *.asm file, the DOUT line looks like this (Shift Register 6):

DOUT_ENTRY TMP5, 5,       6, 7             ; LFO Positive LED

Is that all I need to enter for the LED function to work?