Address
304 North Cardinal
St. Dorchester Center, MA 02124
Work Hours
Monday to Friday: 7AM - 7PM
Weekend: 10AM - 5PM
The horn of Xiaomi 11 Pro has no sound
Machine model: Xiaomi 11 Pro
Fault phenomenon: the speaker of Xiaomi 11 Pro has no sound
Maintenance process: after getting the mobile phone, turn the volume to the maximum. There is no sound from the loudspeaker when playing music.
The horn of Xiaomi 11 Pro has no sound Figure 1.
According to the drawing, the main board charging connector FPC j6400 Measuring diode value was found to be OK, so it was replaced.Remove the horn and use 2V point to sound, indicating that the horn is good.
The horn of Xiaomi 11 Pro has no sound Figure 2.
The two contact points of the horn were measured. The charging connector was disconnected and FPC was connected, and the horn contact was hit. Unexpectedly,Normal value was returned.According to experience, the speaker power amplifier may be on the charging connector small board.
Take down the small board and remove all the small boards shielding cover. It is found that the ringtone power amplifier is next to the card slot. The chip is removed again.Measuring diode value is displayed on multimeter, so it can be determined that it is power amplifier.After replacing a ringtone power amplifier, the fault still remains.
The horn of Xiaomi 11 Pro has no sound Figure 3.
The horn of Xiaomi 11 Pro has no sound Figure 4.
After the CPU was redone, the sound returned to normal, the fault was repaired and the maintenance was finished.
The horn of Xiaomi 11 Pro has no sound Figure 5.
The horn of Xiaomi 11 Pro has no sound Figure 6.
