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R14 checks out as 100R. I sent you an email with a couple of photos of the board.

I removed C4 (unfortunately destroying it in the process, but that's no big deal) with no change. I've checked everything else I can think of and am not finding anything. Can you give me some pointers on exactly what to check?

R14 reads 5v on the right side and the left fluctuates between .05 and .33

Should I replace C4 with another 10n ceramic capacitor?

IC3 shows 0.1V / 0.0V / 0.1V for it's 3 pins I'm not sure how to tell which pin is 10 on IC1. As I look down at the top of the board with the front of the nixies facing me, starting from the upper left end I get: 2.3 / 5 / 0 / .02 / 0 / .02 / 0 / 0 / 0 on the row nearest me starting from the left I ...

The IR LED does indeed glow faintly now. Still no luck on getting the nixies or blue LEDs to light up. I will send you a pic of the board.

I turned it around, and now am reading 2.8 across R2, and 1.15 across the IR LED. Still won't display anything.

Across the pins of the IR LED I get 4.4, but across R2 I get 0.0.

Ah, I had missed the solder bridge. Unfortunately that didn't fix the issue though. It looks like my IR LED is not working. What specifics should I look for in a replacement?

Tony, I got the kit put together and everything worked (all blue LEDs lit and tubes displayed temp in F and humidity) except I couldn't change modes using the IR LED. I unplugged it, checked all the connections, re-powered it and everything worked except no mode change and now it displayed in K. The...