Speaker and handset no sound on Redmi—How to fix?

When playing the music on Redmi, there is no sound from the speaker. When we receive the phone calls, there is also no sound from the handset.  What's going on? How to fix?  Here is the guide.

Disassemble the Xiaomi Redmi by phone opening tools, use digital multimeter to measure the EAR_DET voltage, after measurement, there is no voltage and it is short circuit，R1904 is short circuit.

Take out the R1904 by Precision Titanium Alloy Tweezers, we find the capacitor DCD_HS_DET is short circuit.

Check Redmi schematic diagram, we know that CDC_HS_DET leads to a Redmi power supply IC. Test the Redmi, we find the power supply IC is overheat, replace the new Redmi power supply IC.

Now find a 2.2K (222 capacitor), and then replace the R1904 capacitor, use QUICK 861DW hot air rework station to solder it with jump wire.

Soldering the Redmi power supply IC by QUICK 861DW hot air rework station, and then measure it again, the data tested is normal. 

Assemble the Redmi, and then turn on it, get into IOS to test Redmi speaker and handset, they works, everything goes well!