I had an opportunity to resolder the circuit board in a spare CMOS unit from my original MKI instrument cluster.
I was able to get a fairly good close up picture of an example of some cold solder joints that I thought I would post. This may be helpful to someone that has never seen a cold solder joint.
There are 8 large connections in picture that all show some signs of a cold joint.
The circular ridge around the base of the soldered joint is the sign of a cold joint.
The worst case is the far right joint.
The smaller connections in the upper right corner are good solder joints.
For a size relationship, the large row of 4 joints is 3/4" in length.
Gary