Phone · Motorola · Moto G85
Motorola Moto G85 Logic Board Repair
Logic Board Repair guide for the Motorola Moto G85
Before you begin
Tools
- Precision Phillips screwdriver
- Plastic opening picks
- Suction cup
- Heat gun
- Spudger
- Tweezers
- Soldering iron
- Desoldering braid
Parts / materials
- Rosin flux
- 99% Isopropyl alcohol
- Back cover pre-cut adhesive
- Lead-free solder wire
Safety
- Wear safety glasses while soldering to protect eyes from flux spatter.
- Work in a well-ventilated area to avoid breathing in solder fumes.
- Disconnect the battery before performing board-level soldering to prevent electrical shorts.
- Wear an anti-static wrist strap to protect sensitive microcomponents from ESD.
Overview
Step-by-step
- 1
Power Off and Eject SIM Tray
2 minTurn off the phone completely. Insert a SIM eject tool into the hole at the bottom of the device and pull out the SIM tray.
- 2
Heat the Rear Cover
3 minApply heat around the perimeter of the back cover for two minutes using a heat gun to soften the underlying adhesive.
- 3
Slice Rear Panel Adhesive
5 minAttach a suction cup near the bottom edge, pull upward to create a gap, and insert an opening pick to slice through the adhesive.
- 4
Remove the Back Panel
2 minSlide picks along all four edges to release the remaining adhesive, then lift the back panel off the chassis.
- 5
Unscrew Upper Cover Shield
3 minRemove all Phillips screws securing the plastic upper motherboard cover to the housing.
- 6
Detach the Upper Cover Shield
2 minInsert a spudger beneath the edge of the upper bracket and pry it up to remove it.
- 7
Disconnect the Battery Flex Cable
1 minUse a plastic spudger to pry the battery press connector straight up from the motherboard.
- 8
Disconnect Display and Interconnect Cables
3 minPry up the display flex cable and sub-board interconnect flex cable from their logic board sockets.
- 9
Disconnect Coaxial Antennas
2 minUnplug the antenna coaxial cables from the logic board using fine tweezers.
- 10
Remove Logic Board Retaining Screws
2 minUnscrew the remaining Phillips screws anchoring the logic board to the frame.
- 11
Extract the Logic Board
3 minGently lift the logic board out of the housing by its top edge, taking care not to snag surrounding cables.
- 12
Solder Damaged Logic Board Components
15 minApply rosin flux and use a soldering iron and desoldering braid to clear bad joints or replace damaged surface-mount components.
- 13
Reinstall the Logic Board
3 minPlace the repaired logic board back into the chassis and press gently until it seats flat.
- 14
Reconnect All Board Cables
4 minSnap the antenna coax, interconnect, display, and battery flex cables back into their respective logic board sockets.
- 15
Secure the Upper Cover Shield
3 minPosition the upper plastic cover over the motherboard and reinstall all retaining screws.
- 16
Reseal the Rear Panel
5 minApply new adhesive strips to the housing edges and firmly press the back cover back into place.
After your Motorola Moto G85 logic board repair
Power the Moto G85 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 Motorola Moto G85 job before assuming the part is defective. Keep leftover adhesive and screws labeled in case you need a second pass.
Keep learning
Explore more Motorola Moto G85 repair context in the encyclopedia, or open related DIY guides.
