I have a problem my partner and I have been troubleshooting for a couple of days.
I have a CMB16D-QC that had been running for several years. It runs a 12v Solenoid (for pneumatics on my snowman) Suddenly last year it stopped working. We replaced the solenoid and same issue. What happens is that a signal is sent to the controller board and nothing happens. The solenoid works with the manual switch on it. The light on the solenoid lights up when a signal is applied and the solenoid makes a low humming sound. But the signal from the computer will not activate the solenoid.
We found there is a voltage drop to 7v when the load is applied with the signal (see below)
Here is one little point that hopefully I don't get beat up on, but I am using Xlights as my software and running this through a Falcon controller with DMX. Again, it was working and all of the other DC boards and LOR stuff is working great. I just wanted to mention this in case there could be some odd issue there. It ran fine on the LOR network and ran fine for a couple of years on the falcon/xlights network.
Lastly, one odd thing, both of the boards I am using have a Transistor broken off from cable stress. I never even realized it til now. It would not make sense that would affect the other channels, but I thought I would mention it.
We have tried:
Another exact same board, same exact problem
Measured voltages on the channels and with no load, the channels are getting 12v when the signal is sent
Measured the load while signal is being applied and the voltage drops to 7v. This is consistent with both boards and even a second Solenoid) This is the obvious problem.
Measured current across the channel and it was normal, and not pulling more than .15a when applying the signal
The one thing I have not tried, and that will be tomorrow, is to add 12v to the barrel connector.
It is odd that it worked for several years, then suddenly stopped working.
If anyone has any ideas or thoughts on this, I would appreciate some feedback.