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Thanks for the hep they were backwards. I had assumed that the flat side should have matched up with the board. I'm surprised that everything works since the board was falling apart when I was desoldering it. (PCB's weren't meant to take that much heat.)

Sorry its been a while. I measured the voltages on the LEDs in comparison to ground the flat side of D1 stays at 0.12v and the rounded side stays at 4.41v, D2,3,4,5,6 flat side stayed at zero. D2 rounded side flipped between .74v and .12v, D3 rounded side flipped between .81v and .12v, D4 rounded si...

Tony wrote:Could you measure the voltage across one of the LEDs? - it should change every few seconds depending on display mode. Also any sign of IC1 or 2 getting hot?.

D2,3,4 go between 0v and .55v. D5,6 go between 0v and .45v. Neither of the ICs are getting hot.

This one could be tricky... The flickering tubes and no LEDs mean the HV is working but the controler isn't sending anything to them. Did the LEDs work when it was tested before fitting the tubes?. If you're sure the SMD IC has been damaged just remove it for now and make sure none of the tracks th...

I have they DIY Nixie tube thermometer. Unfortunately I put it together and its not working. the tubes flash a bit, more if I blow around the base of each tube. The LEDs also will not light. I haven't found any solder bridges. I think I may have gotten the surface mount chip too hot. Any help would ...