Chosen Solution
Hi there! I have a NTSC (USA) Master System and button 2 is not working on controller port 1. I have two original controllers and both work perfectly when connected to controller port 2, but if I connect to port 1, button 2 won’t work. I tried resoldering all 9 pins for controller port 1, but problem persists. Any idea what might be wrong? Thank you!
Hello, did you solve your problem? When you re-soldered, did you check continuity between controller port 1, pin 9 to resistor R6 and there to leg 20 in IC #4.
