Galaxy A127(exynos) Earpiece and Mic Not Working

Galaxy A127(exynos) Earpiece and Mic Not Working
Device	Galaxy A12
Affects part(s)	Logic Board
Needs equipment	Soldering Iron, Hot Air Station, Microscope
Difficulty	◉◉◉◉ Specialist
Type	Soldering, BGA

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Problem description

The main microphone and earspeaker are completely non-functional.

This issue typically arises after severe physical damage, such as heavy drops or bending near the shield area.

Note: You may have already attempted replacing components like the screen, dock, or earpiece, but the issue persists.

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Symptoms

• Unable to hear or speak during phone calls
• Voice memos either cannot be recorded or are recorded without sound
• Earspeaker fails the earpiece test in the Samsung service menu
• Diode readings on the Main FPC Connector and earpiece output are within normal range

Solution

Diagnostic Steps

• Visible impact damage or dents on the shield near the affected area

Damage near shield

• Ground pad under the shield is either damaged or torn off with the shield

• Carefully scrape off the first (ground) layer where shown.
  • If you observe bubbling, lifted fibers, or signs of delamination, proceed with the repair steps

Delamination of 2nd layer

Repair Steps

• Remove the first (ground) layer in the affected area
• Access the second layer and carefully remove the damaged and show the traces

Traces exposed of second layer

• Pretin the traces to make jumpers
• Mentioned the traces that go to power ic from cpu for sound functions

traces to pmic

• Use 0.007mm silver jumper wire to reconstruct the connections
• Clean the area thoroughly
• Apply UV-curable solder mask to insulate the repair