I have a #WPT and am missing an entire lamp column. I have been banging my head against this for two weeks now and I am almost certain that the problem is the IC. All the inputs match other ICs but the outputs are different. I have replaced the IC 3 times now with the same result. I have traced every path, checked every resistor and diode and all that I can find different is the IC.
I have been ordering my IC's from Marco but now I am wondering if this is actually the right IC. Here is the original IC from the manual (U15):
and here is the Marco part which comes up with that Stern part number:
Can any electronics guru out there help me find another replacement for this? I have looked but can't find anything that seems to match.