Differential Receiver port won't turn off

[laserman]

One of my F16V3 Controllers has a Differential Expansion Board.  One string-port of one of the Differential Receivers is telling the string to stay on solid white all the time even when no signal is provided.  It never turns off.  When a real signal is sent to the port you can vaguely see it modulating the white but it is still all white.  I swapped things around and confirmed it is definitely a ?white signal? coming from the port.  The Receiver has worked fine for two years until now.  When I powered down the Falcon Controller and the Differential Expansion board the LED string connected to that Receiver port stayed on solid white.  Any suggestions as to a fix or further troubleshooting?

[keithsw1111]

It sounds like a stuck string. If you cut power to the string and reconnect it does it work for a while and then get stuck again ... this can happen when a string when all white draws so much current the string becomes unable to read the data signal and thus doesnt see any new instructions. The fix is power injection or a thicker ground wire.

[laserman]

I had tried powering down the receiver box completely but when I plugged it back in the port came back on solid white.  At that point I just unplugged that port.  Today I plugged the port back in and it is working properly again.  Hopefully it continues working.  Thanks.