Tuesday, July 13, 2021

Finding solder bridge using thermal camera

I had a Dexter with the RESET and DIAGNOSE lines tied together somewhere.  I suspected a solder bridge but I couldn't find it.  So I decided to send some current through RESET and DIAGNOSE and get out my thermal camera to see where things were getting hot.  Here's what I saw:

I eventually found the bridge, but was not in the most intense place on the PCB:


In the future, instead of looking for the most intense spot on the PCB, I should observe the path that the heat is traveling.  The fact that the heat was traveling down and left of where I was applying power was a clue that I would find the bridge somewhere along that path.

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