Use a soldering iron to desolder the antenna cable from the motherboard of the handheld device.

A soldering iron gets extremely hot and can easily burn skin or other surfaces. Always solder in a well-ventilated area.

Though the photo shows the board in the case, it is better to desolder the connections after the motherboard is removed.

The device’s screen is stacked directly above the motherboard, with both components layered tightly together.