Is there a way to test the K155ID1controller? I assumed the set up is the same as the 74141n controller. The 15th and 16th position control the '0' and the '1' digit.
As I was assembling the boards, after I installed the 4th tube (4 of 6) the '0' & '1' digit started displaying simultaneously and for the duration of both digits during the test. I initially thought maybe the board needed a factory reset and waited until the end. I finished and set up the clock with the same result. The '0' & '1' digits always displayed together.
I have removed the 4th Tube thinking it was an issue internal to the tube. Same issue. I removed the 74141N controller and checked for continuity between the 15th and 16th of the 16 pin socket, and there was not indication of a short.