try to repair the gold contact if its not bented. second the plstic knob (black plastic pin) are melted in the back of the board and with time it breaks. i repaired mine by puting softend plastic in each hole( with strong solvent) puting more solvent in both knob and hole and by aplaing presure on the knob ,both plastic get fusioned togeter like brand new good luck. mine i have a audio problem too !

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