How can I replace 10k potentiometer with 5k joystick?
According to the service manual, the potentiometer is connected between the signals called +5DA and AVSS:







simulate this circuit &ndash; Schematic created using CircuitLab

Replacing the 10k potentiometer with a 5k just means that it will draw a constant 0.5 mA more current, which will not be any problem what so ever. +5DA is connected straight through to the main VDD, so it can definitely handle it.