Phone · Samsung · Galaxy S4 Active
Samsung Galaxy S4 Active Logic Board Repair
Logic Board Repair guide for the Samsung Galaxy S4 Active
Before you begin
Tools
- Phillips #00 screwdriver
- Plastic opening tools
- Spudger
- Tweezers
- Anti-static wrist strap
- Magnifying glass or headlamp
- Soldering iron
- Desoldering braid
Parts / materials
- 99% Isopropyl alcohol
- Solder flux
- Lead-free solder wire
- Lint-free microfiber cloth
Safety
- Wear an ESD anti-static wrist strap to prevent electrostatic discharge to sensitive micro-components.
- Work in a well-ventilated area to avoid inhaling dangerous solder flux fumes.
- Wear protective safety glasses when soldering or desoldering micro-circuits.
- Ensure the battery is completely disconnected before touching any internal board components.
Overview
Step-by-step
- 1
Power down the device
1 minPress and hold the Power button, then tap Power Off on the screen to completely shut down the device.
- 2
Remove the rear cover
1 minInsert a plastic opening tool into the notch near the top edge of the back cover and pry it away from the chassis.
- 3
Remove the battery
1 minUse your fingernail or a plastic opening tool at the bottom recess to lift the battery out of its compartment.
- 4
Remove SIM and microSD cards
1 minPress inward slightly on the SIM and microSD cards to unlatch them, then slide both cards out of their slots.
- 5
Unscrew the midframe
3 minUse a Phillips #00 screwdriver to remove the 12 screws securing the rear midframe to the display assembly.
- 6
Unclip and lift the midframe
3 minInsert a plastic opening tool between the front glass assembly and midframe, prying along the perimeter to release the plastic clips.
- 7
Disconnect the display flex connector
1 minUse the flat end of a spudger to gently pop the display ribbon cable off the top left of the logic board.
- 8
Disconnect front camera and sensors
2 minPry up the press-fit connectors for the front-facing camera, earpiece speaker, and sensor assembly using a spudger.
- 9
Disconnect the daughterboard flex cable
1 minDisconnect the lower ribbon cable linking the USB charging port assembly to the bottom edge of the logic board.
- 10
Remove the logic board retaining screw
1 minUse a Phillips #00 screwdriver to remove the single black screw securing the top section of the logic board.
- 11
Lift out the logic board
2 minCarefully grasp the logic board by the edges, lift it from the bottom up, and remove it from the frame housing.
- 12
Clean and reflow target components
12 minApply flux to damaged board joints and use a fine-tip soldering iron or desoldering braid under magnification to repair connections.
- 13
Reinstall the logic board
2 minLower the repaired logic board back into the housing, ensuring no underlying flex cables get trapped beneath it.
- 14
Fasten the board retaining screw
1 minReinsert and tighten the single Phillips #00 screw at the top of the logic board.
- 15
Reconnect logic board flex cables
3 minAlign and press down on the display, front camera, sensor, and daughterboard connectors until they snap into place.
- 16
Reattach the midframe
2 minPosition the midframe onto the front housing and press firmly along all sides until the perimeter clips snap shut.
- 17
Reinstall midframe screws
3 minThread and tighten all 12 Phillips #00 screws back into the midframe.
- 18
Reinsert cards, battery, and back cover
2 minSlide the SIM and microSD cards into place, insert the battery, and snap the rear cover down around all edges.
After your Samsung Galaxy S4 Active logic board repair
Power the Galaxy S4 Active 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 S4 Active 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 S4 Active repair context in the encyclopedia, or open related DIY guides.
