HONOR V40 calls without ringing

Machine model:HONOR V40

Fault phenomenon:HONOR V40 has no ringing tone when calling, and there is no sound when playing video.

Repair process:HONOR V40 calls without ringing tone. It should be that there is something wrong with the loudspeaker or ring control circuit. It is also possible that FPC is out of order.Get the phone, boot random play a ring, but even if the voice is turned to the maximum, still can’t hear the sound.

HONOR V40 calls without ringing Figure 1.

Remove the phone to test whether the speaker can make sound normally. Measure and check that the charging connector small board FPC does not have Inveracious Soldering, which should be caused by the problem of the motherboard.Remove the motherboard and find the location of the ring control circuit. After disassembling shielding cover, carefully observe it under a microscope. It is found that a large Inductor Inveracious Soldering is loose. After checking Boardview, it is known that this is the boost Inductor of the ring amplifier chip.

HONOR V40 calls without ringing Figure 2.

HONOR V40 calls without ringing Figure 3.

Therefore,Inductor was removed and replaced with a new boost Inductor.After the test, the ringtone can be played normally, and the fault is repaired perfectly.