Phone · Samsung · Galaxy S25 Ultra
Samsung Galaxy S25 Ultra Logic Board Repair
Logic Board Repair guide for the Samsung Galaxy S25 Ultra
Before you begin
Tools
- Phillips #00 screwdriver
- Plastic opening picks
- Suction handle
- Spudger
- Tweezers
- Heat gun
- Soldering iron
- Anti-static wrist strap
Parts / materials
- Pre-cut rear cover adhesive gasket
- Flux
- Desoldering braid
- 99% Isopropyl alcohol
Safety
- Always disconnect the battery flex cable before handling or soldering near internal board components.
- Wear safety glasses when working with heat and molten solder to protect against splashes.
- Perform solder work in a well-ventilated area or use a fume extractor to avoid inhaling solder fumes.
Overview
Step-by-step
- 1
Eject the S Pen
1 minPress the S Pen tip inward until it clicks, then pull the stylus straight out from the bottom slot.
- 2
Heat the Rear Cover
3 minApply a heated pad or heat gun around the perimeter of the back glass for two minutes to soften the adhesive.
- 3
Slice the Rear Glass Seal
4 minAttach a suction handle near the bottom edge, lift up, and slide an opening pick underneath to cut the perimeter adhesive.
- 4
Remove the Rear Glass Assembly
2 minCarefully lift the rear glass off the frame and set it aside on a clean surface.
- 5
Unscrew the Wireless Charging Shield
3 minUse a Phillips #00 screwdriver to remove the screws securing the wireless charging coil and upper housing shield.
- 6
Disconnect the Battery Cable
1 minPry the battery press connector straight up from the logic board using a plastic spudger to cut power.
- 7
Remove the Wireless Charging Coil
2 minPeel the wireless charging coil and NFC assembly off the battery and lift it out of the chassis.
- 8
Disconnect Display and Interconnect Flexes
2 minUse your spudger to disconnect the display, sub-board, and antenna flex cables from the logic board.
- 9
Unscrew the Logic Board Retaining Screws
2 minRemove the remaining Phillips screws securing the main logic board to the inner frame.
- 10
Lift Out the Main Logic Board
2 minGently pry underneath the edges of the main logic board with a spudger and remove it from the phone body.
- 11
Reflow Damaged Micro-Components
12 minApply liquid flux to the targeted board area and use a soldering iron with desoldering braid to clear shorts or replace faulty surface-mount components.
- 12
Reinstall the Logic Board
2 minAlign the repaired logic board with the housing cutouts and press it down into place gently.
- 13
Reconnect Flex Cables and Battery
3 minSnap all display, interconnect, and antenna flex connectors back into their logic board sockets, ending with the battery cable.
- 14
Fasten Wireless Coil and Rear Glass
5 minReposition the wireless charging coil, reinstall all retaining screws, apply new perimeter adhesive, and press the back glass firmly sealed.
After your Samsung Galaxy S25 Ultra logic board repair
Power the Galaxy S25 Ultra back on and test the logic board repair function before you put every screw away. Check touch/display response, charging, cameras, buttons, and wireless as relevant to this repair. If something fails after closing the device, reopen carefully and reseat the connectors for this Samsung Galaxy S25 Ultra job before assuming the part is defective. Keep leftover adhesive and screws labeled in case you need a second pass.
Keep learning
Explore more Samsung Galaxy S25 Ultra repair context in the encyclopedia, or open related DIY guides.
