PC-Engine Controller problem (Pin 6 UP/1 buttons)

[Marty]

Hey guys, recently got a PC-Engine console which does not respond to the UP or '1' Button.
I have tested with two controllers which do not respond so I assume it is something to do with the controller port itself.
Visually the port looks fine from the outside looking in, could be some debris within the port causing issues?
I have quickly inspected the pcb and solder joints don't look damaged, but I gather I should start off with reflowing them.

If anyone has experience/suggestions on how to approach, help would much be appreciated

Thanks!

[Keith Courage]

Unfortunately, if the Controller port itself tests okay, then the problem usually lies with the HU6280 Chip itself. You might get lucky and find a bad trace/connection to the chip which could fix it but there have been many times I've encountered this problem where it was the chip itself that was faulty.

[Marty]

Unfortunately, if the Controller port itself tests okay, then the problem usually lies with the HU6280 Chip itself. You might get lucky and find a bad trace/connection to the chip which could fix it but there have been many times I've encountered this problem where it was the chip itself that was faulty.

Forgive me as I am new to this, but what would be the best way to test out the controller port itself? I have seen a youtube video where the both the console and controller were opened whilst plugged in and a continuity check was done that way. Should I do it this way first? Thanks!

[Keith Courage]

First unplug a cable from a controller. Then test each wire to the pins on the board of the PC engine controller port.

[Marty]

First unplug a cable from a controller. Then test each wire to the pins on the board of the PC engine controller port.

Got around to testing it and I do get continuity from my controller to the port itself, above the port there is a section labelled 'FL103' and I also seem to get a connection there too.
 
After 'FL103' I am not too sure where to follow through next to test, any directions would be appreciated.

Thanks!

[Keith Courage]

CHeck and see if the traces from there make it to the pins on the HU6280 chip.