Hi you all guys ! I wanted to mod one SNES system but when I opened the case I saw that there was no PPU1 and PPU2 chips to make 50/60 Hz mod on it !

Instead I found one chip labeled Nintendo "S-CPUN A" "RF5A122" "SGX 9Y". How could I make the mod with this chip ? For what I understand, this chips is the SNES Jr's chip. The board is also labeled with 1995 year on it and "SNSP-CPU-1CHIP-01" but from outside it appears to be the same old version of SNES ?¿?

I'm really scared, could anyone help me with some usefull information about how to mod this chip ?


Picture of the SNES board: