4th Test Light and channel remain on

[keithr]

This is a V5 I built and used last season. During bench test before placing in the yard I check all my units. This v5 LE has the 4th channel on soon as power is plugged in. All other channels seem to work fine. I removed the channel chip from a working unit same results. Any assistance is welcomed,  thank you

[jnealand]

The ones I have had like that ended up being a blown triac.  A pain to replace, but doable.

[keithr]

oh dang all now, I hate the idea of removing it you are correct that will be a pain. thank you sir

[caretaker]

Pull the opto chip for that channel, if it is still on then the triac is most likely bad.  Make sure to check for solder bridges and see if a bigger load changes things before removing the triac.

[keithr]

pulled the chip and the channel remains on. all solder bridges are good. thank you both for your help most appreciated