snes problem

Pal SNSP-CPU-01
Black screen. The only game that plays it's the homebrew Classic Kong Complete that has 256k. But it's full of graphical errors.
There's continuity between cart slot and S-CPU and WRAM. The board looks fine.
Any ideas? I belive it's one of the 32k sram at location U4 and U5.

 

Have you checked C59 for leakage and the traces underneath C59 for corrosion?

 

I have checked the big cap and the traces around it and everything is ok.