LG 42 LA620V-ZA.
Line 3x, 4x, and 5x work (even 5x uncropped/1200 mode despite being a 1080p TV)
Don’t have a SNES/SFC to test so can’t be sure on that. I do get blackouts from my DC despite the OSSC showing a constant green light, but it might be a DC/cable issue. Everything else I’ve thrown at it (JP MD/32X/MCD, JP Saturn, UK GC, UK Wii, UK OG Xbox) work fine.
I tend to keep it in 960p @ 4×280 or 2×480 @ for the best image due to it being a multiple of both screen modes. Looks better, too, imho.