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Sega Genesis / Mega Drive
Knowledge Hub
Guides & how-tos for
Sega Genesis / Mega Drive
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Mega Drive / Genesis jailbars (vertical stripes on RGB video)
Faint vertical bars across the picture, most visible on flat colours over RGB, are interference from the colour subcarrier and other noisy signals on the Mega Drive board. Rule out cables and grounding, refresh old capacitors, then lift or switch off the subcarrier, or fit a subcarrier bypass board if you need to keep composite colour.
by CircuitScope research team · 09 Oct 2026 ·
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