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Nokia Lumia 521 Motherboard Replacement

In this guide we will remove the defective motherboard and replace it.

  • Author: Marko Stanisic
  • Time estimate: 5 - 10 minutes
  • Difficulty: Moderate

In order to replace the motherboard, you first need to remove the battery, SIM card, and backing of the phone. In order to remove the backing, you will need a T5 Torx Screwdriver to remove the screws. Once the back has been removed and the motherboard is exposed, you will need to carefully pry it from the phone using the plastic opening tool.

Step 1 Motherboard  ¶ 

Using the Torx T5 screw head, remove all screws. Note that there are two different sized screws. Five screws are 5 mm long and four are 4 mm long. Five 5 mm screws.

Step 1 Motherboard  ¶ 

  • Using the Torx T5 screw head, remove all screws. Note that there are two different sized screws. Five screws are 5 mm long and four are 4 mm long.

  • Five 5 mm screws.

  • Four 4 mm screws.

Step 2  ¶ 

Using a plastic opening tool, pry apart the inner back case apart from the rest of the phone, starting at the top and prying while going around the phone. Using a plastic opening tool, pry apart the inner back case apart from the rest of the phone, starting at the top and prying while going around the phone.

Step 2  ¶ 

  • Using a plastic opening tool, pry apart the inner back case apart from the rest of the phone, starting at the top and prying while going around the phone.

Step 3  ¶ 

Unclasp the motherboard from the black case clasps using a plastic opening tool. Unclasp the motherboard from the black case clasps using a plastic opening tool.

Step 3  ¶ 

  • Unclasp the motherboard from the black case clasps using a plastic opening tool.

Step 4  ¶ 

Unclip the motherboard clasps using your fingers or a plastic opening tool. Unclip the motherboard clasps using your fingers or a plastic opening tool.

Step 4  ¶ 

  • Unclip the motherboard clasps using your fingers or a plastic opening tool.