Replace the motherboard (main board or logic board) in a Samsung Galaxy S25+ with these steps. This guide applies if your Galaxy won't turn on or shuts down randomly. You will also require replacement back cover adhesive.
Allow Galaxy's battery to drain below 25% to prevent damage and risk of fire.
Cracked phone back glass can cause injury or complicate disassembly.
Avoid applying tape to the phone frame and consider wearing safety glasses during the repair.
Follow the linked instructions for proper heat gun usage to avoid damaging the display and/or battery.
Once heated, carefully separate the back cover from the frame.
Use care when handling the back cover and its adhesive, as it can be damaged easily.
Attach a suction handle to the center of the back cover's bottom edge, ensuring it is as close to the edge as possible.
Apply suction handle firmly until a gap forms between back cover and frame.
Your phone may be hot, so exercise caution when handling it.
Apply heat to the stuck area if necessary.
Insert an opening pick at the bottom right corner of the device.
Insert the opening pick 2-3 mm from the camera lenses to avoid damage.
Use a precision opening pick to carefully pry the adhesive along the top left corner, then work it down the entire length of the left edge.
Use a suction handle to lift off the back cover.
If stuck, reapply an opening pick and separate any remaining adhesive along the edges.
Make sure to power it down completely before proceeding.
Apply new adhesive to either the frame or the back cover, using cutouts and contours to determine the correct placement.
Use the point of a spudger to carefully pry up and disconnect the wireless charging coil press connector.
Keep track of each screw's location for reassembly.
Insert the spudger point into the loudspeaker clip and gently pry it open on the left side.
Press firmly around the perimeter of the reassembled loudspeaker to secure its clips.
Use both hands to carefully lift out the wireless charging and loudspeaker assembly.
Damage to surface-mounted components may occur if the press connector is not disconnected correctly.
Locate the earpiece speaker press connector at the top right corner of the motherboard.
Remove the earpiece speaker's retaining screws using a Phillips screwdriver.
Use a spudger to lift the earpiece speaker by the center of the bottom edge until it unclips.
Be careful not to smudge the cameras or press on surface-mounted components.
During reassembly, press firmly around the perimeter of the speaker to engage its clips.
Use a spudger to pry up and release the three interconnect and screen cable press connectors from the motherboard's bottom edge.
Use the point of a spudger to carefully disconnect the selfie camera and mmWave antenna press connectors.
Remove the rear camera mounting screws using a Phillips screwdriver.
When handling the motherboard, only grip by its edges to avoid damaging connectors or surface-mounted components.
Never press the motherboard onto your work surface — risk of component damage.
Remove cameras from top to bottom due to interlocking design.
During reassembly, ensure the ultrawide camera's pegs fit into motherboard cutouts.
Use the point of a spudger to pry up and disconnect the telephoto camera press connector.
Remove and discard the old motherboard.
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