Received a Xiaomi Mi 10T Pro Microphone does not work, the issue is caused by rain water damage when riding the motorbike outside.
Model: Xiaomi Mi 10T Pro 5G
Announced: 2020, September 30
Defect Phenomenon
- screen with a verticle line
- as the client described, the microphone does not work when making voice call (like use WeChat, WhatsApp, etc. the other side cannot hear the voice)
Troubleshooting
First, let’s disassemble the phone and take out the motherboard carefully.
The motherboard looks fine, there’s no obvious water damaged signs. Only the top location where the microphone located with some corrosive damage
Let’s check under the microscope, both sides of the motherboard with corrosions
Clean the corrosive areas with PCB cleaner first, then remove the shielding cover on the top microphone with tweezers and hot air gun.
After removing the shielding cover we can see the microphone is corrosive already, try to replace the microphone with a new one, then the issue would be resolved.
Repair Process
Remove the microphone with the hot air gun
Then clean the pads on the PCB with solder mask and tin paste
After that, clean the pads thoroughly with PCB cleaner to ensure there is no extra solder paste, because if the solder paste seep into the microphone will cause the voice recording function failure.
Heat with the hot air gun directly to melt the tin paste and get the new microphone soldered
After that, assemble the phone to have a test.
For Xiaomi, we can dial *#*#64663## to get into the test interface. After testing, both the main microphone and the top microphone works normally.
Now we can solder back the shielding cover on the microphone and assemble the phone
Final Test
Get the phone well assembled and test with WeChat voice call again, the phone call voice can be heard by the other side. Issue get fixed perfectly by the top microphone chip replacement.
Visit REWA Academy to learn more repair skills