I have two problem NES controllers, both 004s. One controller does not respond when the dpad is pressed left, and the other controller is completely "dead".
Both appear to have intact traces, so I'm wondering if maybe the IC is at fault in both controllers.
The chip is a HEF4021BP, which i beleive the important numbers are 4021, making it an 8-bit static shift register.
Would any 4021 chip be a drop in replacement? If I simply desolder the old chip and put in a new one, even if the exact naming doesnt match, would it still work? I'm thinking of buying a small lot and trying this. Please let me know what I should be shopping for.
Both appear to have intact traces, so I'm wondering if maybe the IC is at fault in both controllers.
The chip is a HEF4021BP, which i beleive the important numbers are 4021, making it an 8-bit static shift register.
Would any 4021 chip be a drop in replacement? If I simply desolder the old chip and put in a new one, even if the exact naming doesnt match, would it still work? I'm thinking of buying a small lot and trying this. Please let me know what I should be shopping for.