Often connected to a ground or a different signal group.
Use isopropyl alcohol to remove oxidation from the button pads.
Check the center point of the button for a GR reading. If there is no reading, the line is likely broken between the pad and the CPU. Jumper Solutions & Repairs
To identify where a connection is broken, use a multimeter set to .
If a series resistor is found to be open-circuit (shows GR on one side but not the other), you can sometimes "short" or bridge the resistor to restore the path.
Physical drops or internal wear can result in broken "ways" or signal lines on the PCB.
Moisture can cause corrosion on the copper pads, breaking the electrical connection.
Often connected to a ground or a different signal group.
Use isopropyl alcohol to remove oxidation from the button pads.
Check the center point of the button for a GR reading. If there is no reading, the line is likely broken between the pad and the CPU. Jumper Solutions & Repairs
To identify where a connection is broken, use a multimeter set to .
If a series resistor is found to be open-circuit (shows GR on one side but not the other), you can sometimes "short" or bridge the resistor to restore the path.
Physical drops or internal wear can result in broken "ways" or signal lines on the PCB.
Moisture can cause corrosion on the copper pads, breaking the electrical connection.