Huawei P20 Daughterboard Replacement

Step 1

Before you begin, switch off your phone.
Apply a heated iOpener to the back of the phone to loosen the adhesive beneath the back cover. Apply the iOpener for at least two minutes.

Hi guys fingerprint sensor on my Huawei p20 Pro stopped working but I didnt want to attempt screen removal as the chances of damaging the screen were high, but what if I could remove and replace the sensor without removing the screen at £6.00 a pop on ebay for a replacement sensor against a ton plus for a new screen, I opted to take a chance with the sensor, so I removed battery cover glass then all removable parts in the sensor area, once removed I could see a big enough gap to feed the sensor through, now the tricky part I smeared vaseline on the area of the sensor ribbon that fitted between frame and screen and carefully slid it between the frame and screen, now all that was left was to connect the sensor to the connector, there was no way that I could see to slide the ribbon under the frame to connect it so I laid it over that part of frame and connected it to the screen, before I replaced the sensor the phone wouldn't recognise it at all so I was relieved that it detected it now. Works perfectly.

Blasphemy -

Step 2

Secure a suction handle to the bottom of the back cover, as close to the edge as possible.
If the phone's rear glass is cracked, the suction handle may not stick. Try lifting it with strong tape, or superglue the suction handle in place and allow it to cure so you can proceed.
Lift the back cover with the suction handle to create a small gap between the cover and the frame.
Insert an opening pick into the gap.
If you have trouble, apply more heat to further soften the adhesive. Follow the iOpener instructions to avoid overheating.
Slide the opening pick to the bottom right corner.

Step 3

Insert a second opening pick and slide it to the bottom left corner to cut the adhesive.
Leave the opening picks in place to prevent the adhesive from resealing.

Step 4

Insert a third opening pick at the bottom left corner.
In the next few steps whilst cutting around the power button and rear camera make sure you only use the tip of the opening pick to avoid cutting the cable, smearing the lens or damaging the camera.
Start to slide the tip of the opening pick from the bottom left corner along the side of the phone to cut the adhesive.
Leave the opening pick in its place at the top left corner to prevent the adhesive from resealing.

Davor auch aufpassen da ist das Flexkabel des powerbuttons

Maximilian Koos - 01/10/20

Hi Maximilian,

danke für deinen Hinweis. Du hast vollkommen Recht und ich habe den Warnhinweis entsprechend ergänzt.

Dominik Schnabelrauch - 16/10/20

Step 5

If the adhesive becomes hard to cut it most likely cooled down. Use your iOpener to reheat it.
Insert a fourth opening pick under the top left corner of the back cover.
Slide the opening pick along the top edge of the phone to cut the adhesive.
Leave the opening pick in the top right corner to prevent the adhesive from resealing.

Step 6

Insert a fifth opening pick at the top right corner of the phone.
Slide the opening pick along the right side to cut the remaining adhesive.

Step 7

Lift and remove the back cover.
Before installing fresh adhesive and reassembling, remove any remaining adhesive from the phone, and clean the glued areas with isopropyl alcohol and a lint-free cloth.

Step 8

Use a pair of tweezers to peel the black tape next to the rear camera off the motherboard cover.

Do I have to conserve that tape?

Belén Enriquez - 22/06/20

Hi Belén,

the tape is more of a protective film and doesn’t have a function which would affect the phone when not reapplied.

Dominik Schnabelrauch - 26/06/20

Step 9

Remove the eight Phillips #00 screws (3.1 mm length).

Step 10

Use a pair of tweezers to peel the black foil at the bottom end of the phone off the loudspeaker.

Step 11

Slide an opening pick under the right side of the motherboard cover.
Rotate the opening pick slightly to pry up the motherboard cover.

Step 12

Remove the motherboard cover with NFC.

Step 13

Use a spudger to pry up and disconnect the battery connector.

Step 14

Remove the three Phillips #00 screws (3.2 mm length).

Step 15

Use a pair of tweezers to remove the daughterboard cover.

Step 16

Remove the two Phillips #00 screws (3.2 mm length).

Step 17

Use a spudger to pry up and disconnect the main daughterboard connector from the daughterboard.

Step 18

Use a pair of tweezers to pry up and disconnect the connector of the white coax cable from the motherboard.
Unroute the white coax cable from the metal clips on the daughterboard and fold it to the side.

Step 19

Use a spudger to disconnect the main flex cable connector from the motherboard.

Step 20

Remove the charging port and main flex cable by lifting it upwards and then pulling it in the direction of the motherboard.

Step 21

Use a spudger to pry up and disconnect the power and volume button flex connector.

Step 22

Use a spudger to pry up and disconnect the display flex connector and fold the display cable out of your way to remove the battery.

Step 23

Apply a heated iOpener to the screen to loosen the adhesive beneath the battery. Apply the iOpener for at least two minutes.
Try your best not to deform the battery during the following removal process. Soft-shell lithium-ion batteries can leak dangerous chemicals, catch fire, or even explode if damaged. Do not use excessive force or pry at the battery with metal tools.

Step 24

Start to slide a plastic card under the bottom right corner of the battery to cut the adhesive.
Slide the plastic card along the right side of the battery to further release the adhesive. Gently start to pry up the battery while doing so.
If you have trouble prying up the battery, the adhesive may not be loose enough. You can apply some isopropyl alcohol under each corner of the battery and allow it to penetrate for about two minutes to help weaken the adhesive.

Step 25

Slide the plastic card under the whole upper part of the battery and cut the adhesive with it.
Slide the plastic card down to the bottom end of the battery to cut the remaining adhesive.
Use the plastic card to pry up the battery.

Step 26

Remove the battery.
Do not reinstall a damaged or deformed battery, as doing so is a potential safety hazard. Replace it with a new battery.
When reassembling your phone, replace old adhesive with stretch release adhesive strips, double-sided tape, or pre-cut adhesive strips.