Close to the controller port there's a bunch of small parts ... some are resistors, other capacitors and there's some zener diodes which are meant to protect the input pins from the 8v wire on the controller
You might have a controller with a worn out cable and it's 8v wire hit one of the data wires making the port 1 stop working. The solution is find which zener diode block is defective and replace it with another from other board.
It's a 6 pin part (3 of each side) and is pretty small. Should have something like 62z or similar written on it's top and there's a small circle which marks the pin 1. One of it's legs is shorted to GND (the middle one is GND, so some other leg is shorted to the middle leg)
Good luck figuring this out. Any questions post here and I'll try to help
SCPH-10000_GH-001 SCPH-15000_GH-003 SCPH-18000_GH-008 SCPH-30001_GH-005 SCPH-30000_GH-016(V4) SCPH-30001_GH-010(V4)
2xSCPH-10190, 2xSCPH-10350, 2xSCPH-10280
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-Sjeep (As seen on TOXIC OS ELF...)