A volume wheel is a potentiometer used for controlling the audio volume of a device that contains a headphone jack. They are typically used for older portable media players and gaming consoles. The pinout diagram on the right shows the standard 3.5 mm stereo audio plug and the 6-contact (three-pole)...

It is a custom Game & Watch style arcade cabinet. The actual display is a LCD screen which is connected to the Raspberry Pi via HDMI. The controls are a set of buttons, joysticks and D-pad which are all connected to the Odroid board via I2C using MCP23017 port expander IC's. Inside the arcade cabine...

You have either a hardware or software problem. If you have a black Game Boy Zero, try plugging it into a different TV and see if it will still not turn on. Next, try charging the battery for a couple of hours to see if the problem is related to battery charging. If both of those fail, there's proba...