xiaomi redmi A2+ mic speaker ear speaker problem solution
Xiaomi Redmi A2+ Mic, Speaker & Earpiece Problem Solution – Complete Repair Guide
If your Xiaomi Redmi A2+ has issues like no sound from the loudspeaker, mic not recording, or no audio in the earpiece during calls, the root causes can include dirty or blocked openings, faulty audio components on the sub-board, damaged flex cables, or motherboard-level faults. Follow these steps to identify and fix each audio problem.
Symptoms to Diagnose
• Mic Not Working
– During a call, the other party cannot hear you.
– Voice recordings show no input or very low volume.
– The “mic test” in Settings → Sound & Vibration shows no activity.
• Loudspeaker (Bottom Speaker) Not Working
– Media playback (music, videos) has no sound.
– Incoming calls don’t ring—phone still vibrates.
• Earpiece/Ear Speaker (Top Speaker) Not Working
– You can dial out but cannot hear the other party during calls (even though the speakerphone works).
– Volume up/down has no effect on call audio.
Step-by-Step Repair Guide
1. Basic Software Check
• Reboot the phone and test audio again.
• Boot into Safe Mode (power off, then hold Volume Down while powering on) to rule out third-party app interference.
• Go to Settings → Apps → Show system processes → “Sound Recorder” or “Phone” → Clear cache and data.
• Run the built-in hardware test code: dial ##64663## and test each audio component.
2. Clean & Inspect Openings
• Mic: Gently blow or use a soft brush to clear any lint from the microphone hole (near the bottom edge).
• Loudspeaker: Inspect the speaker grill for dust or debris. Clean carefully with a soft brush or compressed air.
• Earpiece: The top speaker can get blocked by dirt under the front glass. Use a toothpick wrapped in cotton to gently remove debris from the earpiece mesh.
3. Test & Replace Sub-Board Components
• Most Redmi A2+ audio parts (mic and loudspeaker) are mounted on a small charging/audio sub-board at the bottom.
• Open the back cover: heat edges with a hairdryer, then use a suction cup and plastic pry tools to lift off the back panel.
• Remove screws securing the mid-frame and gently lift it away.
• Locate the audio sub-board (adjacent to the USB-C port). Disconnect its flex cable from the motherboard.
• Use a multimeter (buzzer mode) to test the mic component on the sub-board: place probes on its two solder pads and tap to see if continuity changes. If no beep, replace the mic (soldered part).
• Similarly, test the loudspeaker by placing probes on its contacts; if open or no sound, desolder the old speaker and solder in a replacement.
• Reassemble temporarily, test audio before sealing. If both mic and speaker now work, the sub-board is replaced successfully.
4. Inspect Earpiece (Top Speaker) & Flex Connection
• If earpiece still fails: open the mid-frame again and locate the earpiece speaker at the top of the frame.
• Disconnect its earpiece flex cable from the motherboard. Clean contacts with isopropyl alcohol and reseat firmly.
• Use a multimeter to check earpiece continuity; if open, replace the earpiece module.
• Also check the tiny filter/resistor on the mainboard along the earpiece audio line; if burnt or open, replace or jumper it.
• Reassemble and test in a live call. If audio returns through the earpiece, no further repair is needed.
5. Motherboard-Level Troubleshooting (If Problems Persist)
• With all replacements on sub-board and earpiece done, but audio still missing, inspect the audio amplifier IC area under the EMI shield.
• Remove the shield (if experienced) and look for damaged or corroded SMD capacitors, resistors, or the amplifier IC itself. Use a multimeter to check continuity and check for short circuits to ground.
• If the amplifier IC is faulty (no output voltage despite correct input), it may need reballing or replacement. This requires hot air rework and precision soldering.
• Check for broken tracks between the audio IC and each component; use a high-resolution boardview or schematic to identify and jumper any open lines.
Reassembly & Final Testing
Reconnect all flex cables—ensuring the audio sub-board and earpiece flex are seated.
Reinstall the mid-frame and back cover with fresh adhesive.
Power on and test: make a call to verify earpiece audio, record a voice note to test mic, and play music to test loudspeaker.
Adjust volume levels in Settings → Sound & Vibration.
If all three components (mic, loudspeaker, earpiece) work reliably, the repair is complete.
Pro Tips
• Always test new components before final assembly.
• Keep track of tiny SMD parts (filters, capacitors) when removing the EMI shield.
• Use only compatible OEM or high-quality spare parts.
• If you lack microsoldering tools, replace the entire audio sub-board instead of individual components.
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