I made some of my own 6 digit, seven segment boards. And had issues with it coming on. Such as not lighting the segments, flickering on sometimes etc.. So I added the brown 0.1uf cap. at the power pins, no cigar, still didn't work. When I soldered the blue 0.1uf cap. to the pins it works perfect. I have a previous 5 digit board and the cap. worked at the power pins. I guess thinner traces all crammed together for the 6 digit board, made for some board capacitance.