Knowledge Hub
Guides & how-tos for Nintendo Entertainment System (NES).
NES blinking red light / grey screen fix (72-pin connector and CIC lockout chip)
A front-loading NES that flashes its power light and the screen about once a second is failing the lockout check, almost always because the cartridge and the 72-pin connector aren't making a clean contact. Clean the games first, then clean, refresh or replace the 72-pin connector; disabling the 10NES lockout chip is an optional extra, not a cure.
by CircuitScope research team · 09 Oct 2026 · 2
Example
Example
by Tristan Tullett · 05 Oct 2026 · 13