My main refurbished NES died. So I pulled out a pile of other refurbished NES units I was planning on selling and decided to find a working unit (since I was too lazy to repair my main system). I noticed that all three of my spare systems had non-working controller ports!?!? I opened them up and checked the wiring. Seemed good.

I guess the main question is: where do I find a replacement? Am I up shit creek here?

A secondary question should be: is this issue normal?!?!?