That connector looks sketchy. Remove it, use a new male connector and stitch the common pins together (yellow to yellow) yellow white to yellow white) on the back of the board while fixing any bad traces first.

Do all new female pins and make sure everything is correct vs the manual (don’t trust what is there)

You can have continuity but still lose voltage. I would make sure you use relatively thick wire and ensure you have a solid connection. I’m guessing the female side is a mess as well?

What does the female side from the transformer look like? Map out where the yellow and yellow white wires go.

That whole connector needs to be redone