Microsoft XBOX CONTROLLER Repair Instructions page 37

9. Lift Out Mainboard
Lift the mainboard out of the mid-frame, taking care not to damage the soldered
connections to the motors.
IMPORTANT:
underside of the board. Light force may be required to separate the boards.
NOTICE: The audio jack module is wedged between the mainboard and I/O board.
It will fall out after removing the mainboard.
The mainboard is connected to the I/O board via a connector on the
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