Samsung Galaxy S21 Logic Board Repair

Insert a SIM eject tool, bit, or straightened paper clip into the SIM card tray hole on the bottom edge of the phone.

Press the SIM eject tool into the SIM card tray hole to eject the SIM card tray.

Remove the SIM card tray.

If you accidentally inserted the SIM eject tool into a microphone hole, don't worry! [link|https://www.ifixit.com/News/32804/why-you-cant-really-damage-your-microphone-port-with-a-sim-eject-tool|new_window=true|You most likely didn't damage the microphone.]

Completely power off your phone before you begin.

A hair dryer, heat gun, or hot plate may also be used, but be careful not to overheat the phone—the display, internal battery, and plastic back cover are all susceptible to heat damage.

Apply a suction cup to the back of the phone, as close to the center of the bottom edge as possible.

Pull up on the suction cup with strong, steady force to create a gap between the back cover and the frame.

Depending on the age of your phone, this may be difficult. If you're having trouble, apply more heat to the edge and try again.

Insert an opening pick into the gap.

Only insert the pick up to 5 mm, as you may damage internal components if you go further.

Slide the pick back and forth along the bottom edge to slice through the adhesive.

Leave the pick in to prevent the adhesive from resealing.

Apply a heated iOpener to the back cover's left edge for two minutes.

Apply a suction cup to the back of the phone, as close to the center of the left edge as possible.

Pull up on the suction cup with strong, steady force to create a gap between the back cover and the frame.

Insert an opening pick into the gap.

Only insert the pick up to 5 mm, as you may damage internal components if you go further.

Slide an opening pick along the left edge towards the bottom left corner to cut the adhesive.

Don't cut past where the camera shell meets the back cover, as you risk cracking the plastic.

Leave the pick in to prevent the adhesive from resealing.

Apply a heated iOpener to the back cover's right edge for two minutes.

Apply a suction cup to the back of the phone, as close to the center of the right edge as possible.

Pull up on the suction cup with strong, steady force to create a gap between the back cover and the frame.

Insert an opening pick into the gap.

Only insert the pick up to 3 mm, as you may damage the secondary interconnect cable, which runs parallel to the right edge.

Slide an opening pick back and forth along the back cover's right edge to cut the adhesive.

Leave the pick in to prevent the adhesive from resealing.

Rotate the right-edge opening pick around the top-right corner of the phone.

Only insert the pick up to 5 mm, as you may damage internal components if you go further.

This procedure can be applied to each corner, except the top-left where the rear-facing camera is located.

Slide the top-most opening pick as close to the camera shell as possible.

Repeat for the left-edge pick.

Heat an iOpener and apply it to the camera shell for two minutes.

As you wait for the adhesive to loosen, note the following:

There's additional adhesive to the right of the camera that you need to cut through.

There's a plate on the back cover surrounding the phone's flash that the pick can get stuck on:

Angle the pick downward to avoid any damage.

Rotate the back cover counterclockwise to create a gap between the camera shell and the frame.

Only insert the pick up to 5 mm to avoid scratching the camera.

Insert an opening pick in the gap.

If this method doesn't work, move to the next step for an alternative method; otherwise, skip the next step.

Slide an opening pick between the camera shell and the frame to cut the adhesive.

There's a significant amount of adhesive securing the frame to the camera shell, so multiple rounds of heating may be needed.

Line up the opening pick's tip with your phone's flash

Insert the pick slowly, making sure to avoid the flash's plate.

The plate's resistance can feel similar to adhesive. Angle the pick downward to keep the pick from sliding into the plate.

Slice the adhesive to the right of the camera.

Remove the back cover.

If your back cover is still sticking to the frame, slide the pick around the edges of the phone until the back cover completely separates.

During reassembly:

This is a good point to power on your phone and test all functions before sealing it up. Be sure to power your phone back down completely before you continue working.

Remove any adhesive chunks with a pair of [product|IF145-020|tweezers] or your fingers. Apply heat if you're having trouble separating the adhesive.

If you're using custom-cut adhesives, [guide|152860|follow this guide|new_window=true].

If you're using double-sided tape, [guide|113604|follow this guide.|new_window=true]

Use a Phillips screwdriver to remove the five 4 mm-long screws securing the motherboard bracket to the frame.

Use a pair of [product|IF145-020|tweezers] to gently pull up and unclip the motherboard bracket from the frame.

Do not completely remove the bracket yet, as it's still attached to the wireless charging coil.

While using tweezers, or your fingers, to hold the motherboard bracket out of the way, use a spudger to pry up the battery press connector.

Take care to pry only under the edge of the connector to prevent damaging the socket itself and surrounding components.

To re-attach [link|https://www.ifixit.com/Guide/Recognizing+&+Disconnecting+Cable+Connectors/25629#s70308|press connectors|new_window=true] like this one, carefully align and press down on one side until it clicks into place, then repeat on the other side. Do not press down on the middle. If the connector is misaligned, the pins can bend, causing permanent damage.

While holding the motherboard bracket out of the way, use a spudger to pry up and disconnect the wireless charging coil's press connector.

Use a Phillips screwdriver to remove the six 4 mm-long screws securing the loudspeaker to the frame.

Insert the point of a spudger into the notch in the top-left corner of the loudspeaker and pry up to release the clips holding it in place.

Remove the wireless charging coil.

Use the flat end of a spudger to pry up and disconnect the primary interconnect cable's press connector.

Use the flat end of a spudger to pry up and disconnect the secondary interconnect cable's press connector.

Use a spudger to pry up and disconnect the secondary interconnect cable's press connector.

Repeat for the main interconnect cable's press connector.

Use [product|IF145-020|tweezers] or your fingers to remove both cables.

Set the cables aside. You'll reuse them during reassembly.

Use a Phillips screwdriver to remove the three 3.5 mm-long screws securing the daughterboard to the frame.

Use the point of a spudger to pry up the daughterboard.

Use your fingers to pull the daughterboard up and away from the bottom of the phone and remove it.

If you feel any resistance, the USB-C port could still be caught in its groove. Gently wiggle the daughterboard while pulling until it completely separates from the phone.