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It is never a good idea using LED lights with Triac switches, which I assume if what will be in your remote control unit. Good old fashioned relay units are fine but there is often a problem with triac and thyristor controls as they do not expect the type of load that LED lights present and they often do not switch on properly causing all sorts of issues including burning out (invisibly) interal circuitry.

It appears from the manual that 00 is 100% full intensity just as you are observing... I can understand how you would be confused by the way it is written in the manual...

It also looks like you have to set chan 1 to be between 0 to 29 to select the RGB mode...and ALSO those color intensity values are "upside down", that is, 00 is full on for each color. and 255 is off.

These manuals can really be confusing.

Contact the maker for support. It sounds like they are faulty.

Have you got a terminator on the far end? If not this is probably the problem.

The most likely case is that one of the main output transistors (if which there are many) is shorted. When the protect circuit senses DC on the final output, it will not allow the output relay to come on to protect the speakers from raw DC. With the power removed, you can check between each outputs Emitter and Collector and you will probably find close to zero ohms. From that point you need to unsolder each of the pins of the bad channel until you find the shorted device(s) and replace them.

'pianoforte'

BREV. N. 838420

See page 22 troubleshooting of this manual. It may help you. dd501 (yamaha.com)

Depending on the model, there are four around that date, it could be the insert jacks are tarnished reducing the signal flow between the pre amp stage and digital power amplifier. It could be the power amplifier has failed. It could even be customer error in wiring. This assumes there is the correct level of signal entering the input sockets of course.

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It's a Line 6 and probably requires a software update from Line 6.