Follow this repair guide for replacing the motherboard on your Samsung Galaxy S4 Active if it's faulty.
Use a plastic opening tool or your fingernail to pry in the divot left of the camera, near the power button.
Press the microSD card slightly deeper with a plastic opening tool or your fingernail until you hear a click.
The card may pop out after releasing it.
Position the plastic opening tool in the battery compartment notch and gently pry the battery up.
Locate and carefully pry off the four metallic pads with the tip of a spudger.
Use the plastic opening tool to pry around the entire edge of the midframe.
Remove the 2.4 mm Phillips #00 screw holding the motherboard in place.
Remove the motherboard.
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