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TC1
From SnesLab
TC1 (trimmer capacitor) is a 20 picofarad variable capacitor, connected in parallel with C2 and in series with X1. It adjusts the frequency of the master clock.
If your SNES is rendering in black and white only, try adjusting this trimmer.
References
- https://passive-components.eu/capacitor-symbols
- Sanglard, Fabien. The Hearts of the Super Nintendo. https://fabiensanglard.net/snes_hearts