More actions
| 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.
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
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- 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
Repair Steps
- Remove the first (ground) layer in the affected area
- Access the second layer and carefully remove the damaged and show the traces
- Pretin the traces to make jumpers
- Mentioned the traces that go to power ic from cpu for sound functions
- Use 0.007mm silver jumper wire to reconstruct the connections
- Clean the area thoroughly
- Apply UV-curable solder mask to insulate the repair