fixing broken controller?

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I just bought a ps2 second hand and the dual shock controller is not working properly with the problem being that some of the buttons don't respond but other buttons do work. Have tried other controllers on the same port and they work fine so it is definitley a problem with the controller.

Can anyone give me some advice on how to fix it?

Any idea?

Please help.

Thanks!

I didn't find the right solution from the Internet.

References www.eurogamer.net/forum/thread/129300

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