Thanks for pictures. I edited one of them for reference here…
You say that you have ~120VAC across pads A and B.
Are you getting no voltage across pads C and D?…I’m assuming you get no voltage.
Please test the AC voltage across pads A and D…you should have ~120V with the power switch on, is this correct?
Assuming you don’t have voltage across C and D, the trace from pad C to B must be broken.
With the IEC power cable unplugged and power switch off test for continuity between C and B. They should be connected, but if they are not then the trace is broken. If this is the problem then you need to jump those 2 pads together with some thick wire…use about 1/4″ of the extra transformer wire that you cut off…tin it first and remove the insulation.
Upon closer look at the photo, please add a little more solder to pad B and re-flow that joint. Make sure the wire is making good connection to the pad. Do this first, to make sure that is not the problem.
Keep me posted.
Good luck.
-Brach