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What's the 5 pin plug on the right for?
The fans connected to this controller have stopped lighting up all at once. They still blow and can adjust their speed. Just no light.
Can I control their light/colour from JRGB on my motherboard?
I don't have a cable for the 5 pin socket on the right.
The 5 pin is thermal-takes proprietary connector that controls the fan speed, lighting and power for the fans. As far as controlling the RGB on the fans from your motherboard, as long as you have the correct connector I don't see why not.
What connector do I need though? They're 5 pin fans that came with the controller many years ago.
You would need to find or make an adapter that splits out the proprietary connection into standard ARGB and (optionally) fan connections.
I’m not sure that such a thing exists, this design was convenient by taking each fan down from 2 cables to one but the achilles heel is the proprietary nature.
Might be easier to find a used replacement controller or to replace all the fans.