Question Two Generic PC Controllers Buttons Not Working

Jul 28, 2019
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Hello, everybody. I just got back from the thrift shop and I bought two controllers. One was a generic USB controller and the other was a generic DB15 controller. Both happen to be broken.

The USB controller mostly works fine, but the R button is not registering. When I press it, it does not work. The button presses fine and the rubber contact presses fine, but it does not register to the board. The L and R buttons are on their separate small boards that can be disconnected and soldered back on. Is there any way that I can fix or replace the button board?

The DB15 controller is in a worse state. None of the buttons register and some of the buttons randomly register even when I'm not pressing them. How do I fix these two controllers? If you want more information on these two controllers, please ask me.