Introduction

To gain access to the motherboard, both the back of the device and the battery have to be removed. One should also maintain a hygienic environment and remain statically grounded for the duration of this fix.

Image 1/3: Use a pin or paper clip to insert in the hole on the side of the phone next to the micro SIM cardholder to remove the tray. Image 2/3: Remove the SIM card tray from the Xiaomi Mi 4 and store somewhere safe. Image 3/3: Remove the SIM card tray from the Xiaomi Mi 4 and store somewhere safe.
  • Check to make sure that the device is powered off.

  • Use a pin or paper clip to insert in the hole on the side of the phone next to the micro SIM cardholder to remove the tray.

  • Remove the SIM card tray from the Xiaomi Mi 4 and store somewhere safe.

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  • Using the flat metal spudger and curved metal spudger, make a wedge between the plastic back cover and the inner frame

  • Using the second spudger, slowly work your way around the perimeter of the device

  • Check for clicking sounds as you are prying the back cover away from the frame

  • As the back cover is almost completely removed, use the suction-cup tool to remove the plastic cover without damaging the back

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Image 1/3: Use a 3.0 Phillip’s head screwdriver to remove the 10 1.2mm Phillip’s head screws in the plastic frame that held the motherboard and battery. Image 2/3: Use a 3.0 Phillip’s head screwdriver to remove the 3 0.5mm Phillip’s head screws in the plastic frame that held the motherboard and battery. Image 3/3: Use the small [https://www.ifixit.com/Store/Parts/Plastic-Opening-Tools/IF145-000-1|plastic opening tool] and place it in the slot on the bottom right corner of the inner frame and carefully pry it off.
  • Place the screws on the magnetic mat to avoid losing them.

  • Use a 3.0 Phillip’s head screwdriver to remove the 10 1.2mm Phillip’s head screws in the plastic frame that held the motherboard and battery.

  • Use a 3.0 Phillip’s head screwdriver to remove the 3 0.5mm Phillip’s head screws in the plastic frame that held the motherboard and battery.

  • Use the small plastic opening tool and place it in the slot on the bottom right corner of the inner frame and carefully pry it off.

I don't think it is necessary to remove the three 0.5mm screws. Note: the right-most orange circle should be placed instead of the red circle above the two larger orange circles - those are the 0.5mm screws which secures a small plate under the plastic cover which is in NOT physically (but electrically via two metal contacts) to the mainboard.

Douglas Ling - Reply

Image 1/3: Use tweezers to gently disconnect the two connectors that are stated in the previous step. Image 2/3: Proceed to gently remove the tape like connector from the battery until it is completely off. Image 3/3: Use tweezer to disconnect battery’s wire from the motherboard.
  • Look keenly for the connections that run across the battery and are connected to the motherboard.

  • Use tweezers to gently disconnect the two connectors that are stated in the previous step.

  • Proceed to gently remove the tape like connector from the battery until it is completely off.

  • Use tweezer to disconnect battery’s wire from the motherboard.

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Image 1/2: Image 2/2:
  • Use the plastic opening tool to gently pry the battery out of its casing for removal.

Using a Pry tool damaged a bit the casing of the battery. I ended up pulling the battery's plastic sticker to remove it (adhesive holding the battery in place)

James Burton - Reply

Image 1/1: Find the other cable connecting the motherboard to the device at the top right-hand side of the phone, and carefully use the tweezers to remove that as well.
  • With the battery removed locate the left-hand cable connected to the motherboard. With the tweezers, firmly grasp the wires of the connector and gently disconnect the cable from the motherboard.

  • Find the other cable connecting the motherboard to the device at the top right-hand side of the phone, and carefully use the tweezers to remove that as well.

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Image 1/2: Image 2/2:
  • Wedge the plastic opening tool, between the motherboard and the inner region of the phone in the slot atop the motherboard.

Do not just try to pry open!

Here you have to be careful, there are two plastic parts restraining the motherboard.

- If we use the above picture as reference, there is the first plastic piece in the top right corner: push it out of the way.

- Second piece of plastic: imagine the motherboard as a rectangle; the plastic piece is in the middle of the bottom segment.

- Push it out, pry out.

James Burton - Reply

Also, in my phone, the mother board had a thin black cable connected to the down speaker.

EDIT: You can disconnect the cable by using a prying tool to gently "unclip" the connector.

James Burton - Reply

Conclusion

To reassemble your device, follow these instructions in reverse order.

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William Pendeergraft

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USF Tampa, Team 15-6, Blackwell Fall 2015 Member of USF Tampa, Team 15-6, Blackwell Fall 2015

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5 Comments

Ruined my motherboard to Xiaomi mi4c, do you know where can I buy?

Milos Milos - Reply

I have broken one of the cable connections on the motherboard ( top one in Step 6). Do you know where I can buy a new motherboard?

Ben Dungey - Reply

you can buy the motherboard on taobao.com

Dong Zhengyue -

sim card reader is damaged. Do I need to have whole motherboard replaced

Shravan - Reply

sir i need MI4I motherboard unable to find elsewhere

Mobile # 09060907775

Thalanki Balaji - Reply

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