Are you frustrated about the poor processing performance of your Samsung Galaxy S21 Plus? Don't Worry! Follow our easy step-by-step guide to Samsung Galaxy S21 Plus Motherboard Replacement!
Samsung Galaxy S21+ 5G Android smartphone features a large 6.7-inch display and Exynos 2100 chipset with 8 GB RAM. A faulty motherboard will slow down your S21 Plus. You must replace it to restore your phone’s processing speed.
Let's replace the defective motherboard of your Galaxy S21+!
Step 1 Prepare Mobile Repairing Tools
Collect all these useful mobile repairing tools to replace the motherboard of your Galaxy S21 Plus:
- A Hot Air Gun or Hair Dryer to heat the phone
- A SIM Card Tray Ejector Pin
- A Suction Cup
- A plastic opening pick or tool
- A spudger or prying tool
- A set of screwdrivers
- Tweezers
- New adhesive glue
- A Cotton Bud
- Isopropyl Alcohol
- A clean cloth
- New Samsung Galaxy S21 Plus Motherboard Replacement
Step 2 Turn Off Your Galaxy S21 Plus
Follow these few steps to switch off your Samsung Galaxy S21 Plus:
- Press the side and volume down button simultaneously
- Wait for a few seconds.
- A menu will pop up on the screen.
- Select the power off option.
- Then tap on the power off option again to switch off your S21+.
Step 3 Eject SIM Card Tray
- Find a tiny hole at the bottom edge of your S21+ near the SIM Card Tray.
- Insert the SIM Tray ejector pin in this hole.
- Firmly press the pin until the SIM Tray partially pops out.
- Remove the SIM card tray of your Samsung Galaxy S21+ with your fingers.
- Keep the SIM Card Tray in a safe place.
Step 4 Heat The Phone Edges
- Adjust medium heat settings on your hot gun or hair dryer.
- Keep the hot air gun or hair dryer at least 5 to 10 cm away from your phone.
- Heat the phone to melt the adhesive around its edges. Heat will melt the adhesive glue present around all the phone edges.
- Too much heat can damage the internal components of your S21+.
- Now it is time to slice the adhesive around the phone edges.
Step 5 Attach A Suction Cup
- Take a suction cup of medium size.
- Attach the suction cup near the bottom edge of your Galaxy S21 plus back cover.
- Pull up the suction cup handle.
- A gap will form between the back cover and the phone frame.
Step 6 Insert The Opening Tool
- Insert the plastic pick or opening tool inside the gap between the back cover and the phone frame.
- Remove the suction cup.
Step 7 Cut The Bottom Adhesive
- Move the plastic opening pick or tool from the phone’s lower right to the lower left corner.
- Repeat this step twice to cut the bottom edge adhesive of your S21+.
- If it is difficult to cut the adhesive, you can reheat the phone for 2 to 3 minutes.
Step 8 Slice The Left Adhesive
- Keep moving the opening pick from the lower left to the upper left edge of the phone to cut the left adhesive.
Step 9 Cut Through The Upper Adhesive
- Now move the plastic pick from the phone’s upper left to the upper right corner.
- Repeat this back-and-forth pick motion to cut the upper edge adhesive.
Step 10 Cut The Right Adhesive
- Keep sliding the pick from the upper right to the lower right edge of your S21 Plus to cut the right adhesive.
Step 11 Detach The Rear Cover
- After removing adhesive around all edges of your Galaxy S21+, hold the rear cover of your S21 Plus with your fingers.
- Remove the rear cover.
Step 12 Unscrew The Wireless Charging Coil And NFC Antenna Assembly
- There are five 3.9 mm-long screws securing the wireless charging coil and NFC Antenna Assembly.
- Unscrew all the screws of the wireless charging coil and NFC Antenna Assembly with a screwdriver.
- Keep these five screws in a safe place.
Step 13 Disconnect The Wireless Charging Coil
- Pry up the Wireless Charging Coil press connector with a spudger to disconnect the wireless charging coil from the motherboard.
Step 14 Disconnect The NFC Antenna
- Unclip the NFC Antenna press connector with a spudger to disconnect it from the motherboard.
Step 15 Remove The Wireless Charging Coil And NFC Antenna Assembly
- Insert an opening pick under the charging coil to slice its adhesive.
- Hold the wireless charging coil and NFC antenna assembly with tweezers.
- Remove the wireless charging coil and NFC antenna assembly from its recess.
- Keep it aside.
Step 16 Disconnect The Battery
- Lift the battery’s press connector with a spudger to disconnect the battery from the motherboard.
Step 17 Disconnect The Display Cable
- Unclip the display cable’s press connector with a prying tool.
Step 18 Disconnect The Flex Cables
- There are two flex cables connected to your S21 Plus motherboard.
- Use a spudger to unclip the press connectors of these two flex cables.
Step 19 Unscrew The Top Speaker
- Unfasten the seven 3.9 mm-long screws of the top speaker of your Galaxy S21+ with a screwdriver.
- Keep these screws separate from other screws.
Step 20 Disconnect The Top Speaker
- Detach the earpiece speaker’s press connector with a spudger to disconnect it from the motherboard.
Step 21 Remove The Top Speaker
- Pry up the top speaker with a prying tool from its recess.
- Remove the earpiece speaker.
Step 22 Disconnect The Front Camera
- Unclip the press connector of the front camera with a spudger or prying tool.
Step 23 Disconnect The Power Button
- Disconnect the power button flex cable with a prying tool.
Step 24 Disconnect The Antenna
- Unclip the Antenna flex cable with a spudger or opening pick.
Step 25 Remove The Rear Cameras And Motherboard Assembly
- Unscrew the rear camera and motherboard assembly.
- Lift the rear camera and motherboard assembly with a prying tool from its recess.
- Hold the rear camera and motherboard assembly with your fingers or tweezers.
- Remove the rear camera and motherboard assembly from the phone.
Step 26 Separate The Rear Cameras From The Motherboard Assembly
- Disconnect the rear camera assembly from the motherboard.
- Remove the rear camera assembly from the motherboard.
Step 27 Install The New Motherboard
- Connect the rear camera assembly to the new S21 Plus Motherboard.
- Install the new motherboard assembly to its recess.
Step 28 Reassemble Your Galaxy S21 Plus
To reassemble your Samsung Galaxy S21+ follow these steps:
- Reconnect the display cable and the flex cables.
- Reconnect the battery, power button, and antenna to the motherboard.
- Fasten up all the screws.
- Reattach and connect the wireless charging coil and NFC Antenna Assembly to the motherboard.
- Dip a cotton bud into Isopropyl Alcohol.
- Rub this cotton bud around the edges of the phone frame and rear cover.
- Isopropyl Alcohol will soften the remaining adhesive in 2 minutes.
- Wipe away the old adhesive and isopropyl alcohol with a clean cloth.
- Apply new adhesive around the edges of the rear cover.
- Fix the rear cover to the phone frame.
- Let the new adhesive to dry for 15 to 20 minutes.
Wrapping Up
Congratulations! You have successfully replaced the malfunctioning motherboard of your Samsung Galaxy S21 Plus with our step-by-step guidelines. Turn on your Galaxy S21+ and test the processing performance of your S21 Plus’s new motherboard. Submit the old S21 Plus + motherboard to E-waste for recycling.