Phone · Motorola · G100
Motorola G100 Logic Board Repair
Logic Board Repair guide for the Motorola G100
Before you begin
Tools
- Phillips #00 screwdriver
- Plastic spudger
- Opening picks
- Precision tweezers
- Heat gun or iOpener
- Fine-tip soldering iron
- Desoldering braid
- Anti-static wrist strap
Parts / materials
- Liquid flux
- Isopropyl alcohol (99%)
- Pre-cut rear cover adhesive strips
Safety
- Wear safety glasses when heating the glass and working with a soldering iron.
- Disconnect the battery immediately after opening the device to prevent short circuits.
- Perform soldering in a well-ventilated area or use a fume extractor to avoid inhaling toxic solder fumes.
Overview
Step-by-step
- 1
Power off the device
1 minPress and hold the power button, then select Power Off on the screen. Make sure the device is fully shut down before proceeding.
- 2
Eject the SIM tray
1 minInsert a SIM eject tool into the small hole on the left edge of the phone. Push firmly until the SIM tray pops out, then remove it.
- 3
Heat the rear panel
3 minApply a heat gun or iOpener around the outer edges of the rear cover for 2 to 3 minutes to soften the adhesive.
- 4
Slice the rear adhesive
4 minInsert a plastic opening pick into the gap between the frame and the rear cover. Slide the pick along all edges to cut through the adhesive.
- 5
Remove the rear cover
2 minGently lift the rear cover off the phone frame. Clean away any residual adhesive tape from the inner rim.
- 6
Unscrew the upper shield
3 minUse a Phillips #00 screwdriver to remove the 11 screws securing the plastic motherboard bracket.
- 7
Detach the motherboard bracket
2 minInsert the flat end of a spudger under the corner of the upper midframe bracket and lift it off the board.
- 8
Disconnect the battery cable
1 minPry the battery press connector straight up off the motherboard using a plastic spudger to cut power.
- 9
Disconnect ribbon cables
2 minDisconnect the main display flex cable and the sub-board interconnect cable from their motherboard sockets.
- 10
Disconnect the camera modules
3 minPop off the press connectors for the rear camera cluster and front camera, then lift the camera modules out.
- 11
Unhook the antenna cables
2 minUse precision tweezers to pry up the white and black coaxial antenna cables from the logic board connectors.
- 12
Remove motherboard screws
2 minRemove the single Phillips screw securing the bottom corner of the logic board to the inner chassis.
- 13
Lift out the logic board
2 minPry gently beneath the edge of the logic board with a spudger and lift the board free from the phone frame.
- 14
Reflow motherboard components
10 minApply liquid flux to damaged solder joints and use a fine-tip soldering iron to reflow or solder replacement SMD components.
- 15
Reinstall the logic board
3 minSeat the logic board back into the chassis frame, ensuring no underlying ribbon cables or antenna wires get trapped.
After your Motorola G100 logic board repair
Power the G100 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 G100 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 G100 repair context in the encyclopedia, or open related DIY guides.
