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When the device experiences power issues, freezes, or completely fails to start, the Motherboard is most likely the cause. It is the main circuit board that controls the GPS's functions, so any damage to it can cause the device to stop working entirely.
The motherboard, being the main control component, is connected to all other parts in the device. This means it requires disconnecting or removing these connection points from the motherboard. In this guide, soldering will be required to remove all the wires connecting the various components to the motherboard. It is essential to follow the first few steps to remove power from the device. If you are unfamiliar with soldering or need a refresher, refer to the How to Solder and Desolder Connections guide.
This repair guide will safely walk you through replacing the motherboard of your Garmin Drivesmart 55 EX device.
Before you begin, make sure the device is powered off and unplugged from the charger.
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Use a T5 Torx screwdriver to remove the four 4.2 mm black screws from the back case.
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Insert the plastic opening tool into the gap between the screen and case, and release the clips along the edges of the device.
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Gently separate the screen from the case and place the device flat on the surface.
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Use a T5 Torx screwdriver to remove the four 3.8 mm silver screws from the motherboard.
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Gently pry the motherboard up using the plastic opening tool.
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Use your fingers or tweezers to disconnect the battery connector on the underside of the motherboard.
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Desolder the three solder points with a soldering iron to disconnect the wires from the motherboard.
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Use a spudger or a clean fingernail to flip up the locking flap on the ZIF connector.
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Use tweezers to gently pull the gold ribbon cable from the socket on the motherboard.
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Remove the screen.
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Remove the motherboard from the device.
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To reassemble your device, follow these instructions in reverse order. Take your e-waste to an R2 or e-Stewards certified recycler.
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Purdue University Northwest, Team 7-1, Dieterle Spring 2026 crwdns2935289:0Purdue University Northwest, Team 7-1, Dieterle Spring 2026crwdne2935289:0
PNW-DIETERLE-S26S7G1
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