This guide will show you how to disassemble the Garmin Nuvi 1390LMT GPS to replace the battery.
No parts required.
Snap the plastic cover off using a plastic opening tool.
Remove the four black 11 mm T5 torx screws.
Pop the screen cover off with a plastic opening tool.
Flip the screen over out of the case.
Remove the two silver 5 mm T5 torx screws connecting the circuit board to the plastic casing.
Flip the circuit board over onto the screen.
Disconnect the harness between the battery and the circuit board.
Peel the battery from the plastic back with a plastic opening tool.
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