yeah, I've had a couple remotes where that particular pot broke. so strange.
glad you got it though, and I wasn't off the mark!
the separate transistor, I haven't seen that on U5000s, but have on K7500s, and that's for horizontal size. U5000 has the jumper pin arrangement depending on whether you're running standard or medium res. I had one monitor where it made a significant difference and another that it didn't matter which res you ran. maybe that's just a case of one having some of the updates installed and the other not. I don't know.
that's all moot. once again, glad you got it working.