Vertical lines
Vertical lines
Vertical lines or faint banding running down the picture are a classic Super Nintendo symptom. Depending on the exact appearance, the cause ranges from a normal signal artifact to a contact problem on the board, so identify which you are seeing.
Faint, evenly spaced lines
Subtle vertical banding over an otherwise good RGB image is common on stock boards and comes from the way the signal is routed internally. An RGB bypass mod typically cleans this up, drawing the signal from a quieter source. This is a picture quality refinement, not a failure. banding RGB bypass
Solid colored lines or corruption
- Bold vertical bars, missing columns, or scrambled graphics usually indicate a connection fault.
- The most frequent cause is poor contact at the cartridge slot, so clean both the cart and the slot.
- If a flashcart shows it across all games, suspect its contacts or seating.
Persistent corruption
If solid lines or graphical garbage remain after thorough cleaning and reseating, the fault may lie with a PPU or a cold solder joint on the video circuitry. Cracked joints around the picture chips can produce stable vertical artifacts that respond to a careful reflow. PPU contacts
Start with the easy fixes: clean contacts and a reseated cartridge resolve most line problems. Reserve board level diagnosis for cases where cleaning makes no difference.