Headphone + Joystick repair.
Both of the equipment is left by former roommate.
Some buttons on panel have no reaction unless you press them firmly. It seems Conductive Rubber under the buttons are dirty.
Teardown the device.
Water wash the buttons/rubber and clean the PCB by using eraser.
Finally, reassemble the joystick and do a test.
=================HeadPhone=============
Logitech headphone.
The volume controller has problem. Even very tiny touch on the controller will mute the right hand side speaker.
Teardown.
At first, I thought just the right-pass of variable resistor is open circuit. Soldering three new ‘Bridge’ will cross the problem.
The Bridge (from another headphone dead body~)
Done. Bridges connected the end-points of tuner
Unfortunately, annoying buzz and mute problem still exists.
I realized it was not a open circuit, but a short circuit. There is an unexpected connection between Right and Ground cable.
Plan B:
Direct connection, no tuner.
Tested, all green.
Mission accomplished.
