Phone · Motorola · Moto G9
Motorola Moto G9 Logic Board Repair
Logic Board Repair guide for the Motorola Moto G9
Before you begin
Tools
- Precision Phillips PH00 screwdriver
- Plastic opening picks
- Nylon spudger
- Tweezers
- Magnifying glass
- Soldering iron
- SIM eject tool
- Heat gun or iOpener
Parts / materials
- Solder flux
- Desoldering braid
- 99% Isopropyl alcohol
- Lead-free solder wire
- Replacement rear adhesive strips
Safety
- Wear safety glasses while soldering to protect against flux splatter.
- Work in a well-ventilated area to avoid inhaling soldering fumes.
- Disconnect the battery immediately after opening to prevent short circuits.
- Wear an anti-static wrist strap to avoid ESD damage to sensitive microelectronics.
Overview
Step-by-step
- 1
Eject SIM card tray
1 minInsert a SIM eject tool into the hole beside the tray on the left edge. Push firmly to pop out the SIM card tray and set it aside.
- 2
Heat rear panel edges
2 minApply a heated iOpener or hair dryer around the perimeter of the back cover for two minutes to soften the adhesive.
- 3
Slice rear cover adhesive
4 minInsert a thin plastic pick between the back cover and frame near the bottom port. Gently slide around the edges to separate the glue.
- 4
Disconnect fingerprint reader
2 minSlightly lift the back cover from the right side. Use tweezers to pop off the fingerprint sensor flex cable connector before fully removing the cover.
- 5
Unscrew upper motherboard cover
3 minUse a PH00 screwdriver to remove the screws securing the plastic motherboard protective bracket.
- 6
Remove motherboard bracket
2 minInsert a spudger under the edge of the plastic bracket and lever it up to free it from the chassis.
- 7
Disconnect battery cable
1 minPry the battery press-connector straight up from its motherboard socket using a nylon spudger. This prevents electrical short circuits.
- 8
Detach flex cables and antenna
3 minDisconnect the main interconnect cable, display flex cable, and coaxial antenna cable from the logic board using a spudger.
- 9
Unscrew logic board
2 minRemove the remaining Phillips screw that anchors the logic board to the inner frame assembly.
- 10
Remove logic board
2 minGently pry up the top edge of the logic board and lift it clear of the frame without snagging any loose flex cables.
- 11
Inspect motherboard under magnification
5 minPlace the board under a magnifying glass or microscope to identify shorted capacitors, blown filters, or cracked solder joints.
- 12
Apply flux to target area
2 minDispense a small amount of liquid or gel flux onto the damaged component and surrounding solder pads.
- 13
Resolder faulty connections
8 minTouch the tip of a fine soldering iron with fresh solder to the targeted joints or components to reflow the connections.
- 14
Clean board with isopropyl alcohol
3 minUse a soft brush dampened with high-percentage isopropyl alcohol to scrub away flux residue and debris from the repair site.
After your Motorola Moto G9 logic board repair
Power the Moto G9 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 G9 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 G9 repair context in the encyclopedia, or open related DIY guides.
