SuperCIC - reset button not switching 50/60hz

Hi all,

I've added a SuperCIC to one of my SNES consoles today, but am getting some weird behaviour but I think I might be just having a daft moment.

I use Mmmonkey's guide using a kit from Bad-Ad84, and I've got it to boot and the games I've tested seem to be working fine - Kirby 3 (Japanese), Super Mario All-Stars (PAL), Street Fighter Zero 2 (Japanese) though Super Mario RPG wasn't getting beyond a black screen, but I think the cart pins and/or the cart slot in the SNES needs a clean. The games start in the country's native refresh rate and then drop back to 50hz after 9 seconds; however, I'm after the opposite - switch to 60hz after 9 seconds.

The unusual behaviour is that when I hold down the reset button to change the function, it just resets the console immediately rather than changing the refresh rate no matter how long I hold it down for.

I've wired down pin 4 on the SuperCIC as +5v and pin 7 on the SuperCIC as GND. The original CIC has been removed and a 10k resistor has been fitted between pad 8 and GND (I used the shielding spot on the PCB as a local GND). The LED is orange and does not change colour. I've also triple-checked my connections and everything seems to check out, with no bridges on the CIC pads. The only alteration I had to make was to find another spot for pad 7 of the CIC, as I lost the pad when I removed it from the PCB. I traced it back to one of the pins on U18 and connected it to that instead.

When I modded it pre-SuperCIC, I had to do some extra trickery to get it to work as the usual trick didn't work using a switch. I can't remember what I did (it was a few years back), but I think it was because it was a F413B CIC and I lifted one of the pins on U18 and applied +5v or GND (can't recall which - it was a DPDT switch, so U18 was altered depending on if the CIC was enabled or disabled with the switch).

Any thoughts?

 

Forgot to add, the PCB's marked 1992 and SNSP-CPU-02 if that's of use!

Edit: Here's a quick mockup in Eagle:



I did some reading and it sounds like pin 8 or the 10k resistor may be the issue since that is connected to the reset line. If I get time tomorrow to fire up the soldering iron I might re-do that one, but again - any feedback from the more experienced modders here would also be appreciated!

 

Update - all fixed, thanks to Bad_Ad84 for letting me know I was on the right track and for confirming the decoupling cap info.

For the sake of posterity, upon inspection pins 13 and 14 were bridged on the SuperCIC (so the pad for pin 8 on the PCB CIC was going straight to GND, which affected the reset switch on the console). I repaired the bridge and installed the decoupling cap between pins 1 and 14, and it's working like a charm now. Super Mario RPG, SFZ2 and Kirby all worked perfectly!

 

I am experiencing similar problems with my reset button. But my problem is, that the RESET button stopped working at all. I can confirm that pin 13 and 14 are bridged. I am not very versed with electronics so I'd like to kindly ask you how you repaired the bridge and how you installed the decoupling cap between pin 1 and 14. And why isn't this a general problem for all SuperCIC users?

Thank you and best regards,
Konrad