POCO F3 Earpiece Speaker Replacement Guide- Redmi K40/ Xiaomi 11x / 11i

Hi everyone, welcome back to Geardo.
Today, we will show you how to replace the earpiece speaker (top speaker) on the Poco F3, also known as the Xiaomi Mi 11X and Redmi K40.

If you can’t hear calls properly, the sound is very low, or completely missing from the top speaker, replacing the earpiece will resolve the issue. This guide is beginner-friendly but involves removing the logic board, so take your time with each step.

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Repair Overview

• Device Type: Smartphone
• Repair Type: Earpiece Speaker Replacement

Repair Difficulty: ★★★☆☆ (Moderate)

• Estimated Time: 45–60 minutes

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Reasons for Repair

• No sound during calls
• Very low or muffled earpiece audio
• Crackling sound from top speaker
• Earpiece not working at all

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Before You Begin

Compatibility and Model Numbers

• Redmi K40 Series ( Redmi K40 / K40 Pro / K40 Pro Plus) 
• Xiaomi 11x / 11i Series
• Poco F3 Series

Model Numbers : M2012K11AG, M2012K11AC, M2012K11C, M2012K11AI, M2012K11I

This guide is based on the Redmi K40, which shares identical design with the Poco F3 and Xiaomi Mi 11X / Xiaomi Mi 11i. These are rebranded regional models, but always watch for minor internal differences during the repair.

Tools Required

• Mobile phone heating pad or hairdryer/heat gun
• Plastic pry tool / card pry
• Suction cups
• Phillips #00/#000 screwdrivers
• Torx (T2/T3/T4) screwdrivers
• Flathead screwdriver
• Tweezers (for connectors)
• B7000 glue or double-sided adhesive (for back cover)
• Rubber bands or bonding clips to secure the back cover

How to Find Tools and Parts

• Heating pad – https://amzn.to/3H0tHzJ
• Portable Heat Gun – https://amzn.to/4mszih1
• Clamps https://amzn.to/3GYJT4w
• STREBITO 142 Piece Repair Tool Kit https://amzn.to/3UO1jUx
• Glue | Adhesive https://amzn.to/46exVxe
• Compatible Parts –
  • Battery – https://amzn.to/4t0Aw6W
  • Screen – https://amzn.to/48hkKfR
  • Other Parts – https://amzn.to/4cF5E69
• Silicone Work Repair Mat https://amzn.to/45Emz5l

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 Protect Your Phone 

• Best Premium Case https://amzn.to/4cF5E69 
• Screen Protector https://amzn.to/423YP86

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Important Note (Compatibility)

This guide is based on the Redmi K40, which shares identical internal design with the Poco F3 and Xiaomi Mi 11X. These are rebranded regional models, so the same steps apply.

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Step-by-Step Earpiece Replacement

Step 1: Power Off & Remove SIM Tray

Turn off the device and remove the SIM tray.

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Step 2: Open the Device & Remove Back Cover

• Apply gentle heat around the edges
• Use a suction cup to lift slightly
• Insert a plastic card/pry tool
• Carefully cut through adhesive and remove the back cover

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Step 3: Remove the Board Frame

• Undo 11 screws
• Disconnect the flash connector
• Lift and remove the board frame

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Step 4: Remove the Logic Board & Connectors

Follow this sequence carefully:

• Disconnect:
  • Two antenna cables
  • Main flex cable
  • SIM reader flex
  • Power/fingerprint flex
• Slightly move the front camera if needed
• Carefully lift and remove the logic board

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Step 5: Remove the Faulty Earpiece

• Locate the earpiece at the top section
• Apply gentle heat if adhesive is present
• Unscrew or lift the earpiece carefully
• Remove it from the frame

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Step 6: Install the New Earpiece

• Place the new earpiece in position
• Align it properly with contact points
• Secure it (screws or adhesive depending on unit)

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Step 7: Reinstall the Logic Board

• Place the logic board back into position
• Ensure correct alignment
• Reconnect:
  • Main flex cable
  • SIM reader flex
  • Antenna cables
  • Power/fingerprint connector

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Step 8: Reinstall the Board Frame

• Place the board frame
• Secure with 11 screws
• Reconnect the flash connector

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Step 9: Test Before Closing

Power on the device and check:

• Call audio from earpiece
• Speaker clarity

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Step 10: Close the Device

• Apply adhesive if needed
• Place the back cover
• Press firmly around edges
• Use clips or rubber bands for proper bonding

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FAQs

Q1: How do I know if the earpiece is faulty?

If you cannot hear calls or the sound is very low or distorted, the earpiece may be damaged.

Q2: Is this repair difficult?

It’s moderate since it requires removing the logic board.

Q3: Can cleaning fix the issue?

Sometimes. Try cleaning first, but replacement is needed if damaged.

Q4: Do I need adhesive for the earpiece?

Some units use light adhesive—apply if necessary.

Q5: Will this fix call audio issues completely?

Yes, if the issue is hardware-related.

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Troubleshooting (After The Repair)

Q1: No sound after replacement

• Check earpiece alignment
• Reconnect all cables properly

Q2: Low volume persists

• Ensure proper seating of earpiece
• Check for dust or blockage

Q3: Phone not turning on

• Verify battery and connector connections
• Recheck logic board installation

Q4: Back cover not sealing properly

• Use new adhesive or B7000 glue
• Apply pressure with clips

Q5: Distorted sound

Check contact points

Ensure earpiece is not misaligned

Related Guides

Check Other POCO F3 Repair Guides

View Xiaomi Mi 11 Lite Repair Guides