Take voltage readings on the output lugs (should go from zero to almost 12 volts)
Rick R.
Joshua,
As Rick mentioned earlier in this thread, first try reading the voltage on the output lugs to see if you're getting a smooth ramp up to 12V from 0 when you turn the channel on in LSP or whatever Software you're using.
Another thing to check is to lookup the chip or triac part number on Mouser or just google it for the manufacturer's website. You can then lookup the specifications for that chip or triac and see which pin is supposed to have a 5V or 3V supply signal. Most schematics will say Vcc or something similar to designate this pin. That's the supply that makes the chip work.
For the triacs, find out which one is the "input" signal - the one that doesn't switch the 12V or go to the output lug. That signal tells the triacs to turn on or not turn on. You could also monitor that pin with the voltmeter to see if the triac is getting the right signal to turn on. Again, the spec sheet for the triac will tell you what voltage should "turn on" the triac. For those channels that don't seem to work, check to see if the input signal is changing when you turn on the channel in the software.
If you check out the specifications for the driver chip, you can tell what function the pin that was broken does.
I'm sharing all the detailed info with you so that you have enough information to figure out what's going on with your board. If you work thru some of these items, you will be learning some electronics basics which will help you along the way.