No Ring - Lenovo A516 Service Manual

Repair Manual of Lenovo A516 Mobile Phone
3.3.2

No ring

Replace Speaker and recheck whether it is
normal?
Check to see whether the SPK contact
shrapnel is normal?
Replace main FPC and check whether it is OK .
Check whether main FPC connector is welded
well
Use earphone to test whether there is sound; if
there is sound from earphone, there is audio
signal to input. Check whether U2 module
device is of cold solder joint; recheck whether it
is ok after re-welding,
Check to see whether the main chip U1301 is
damaged. Replace it if damaged.
No ring
N
N
N
Y
OK
Y
OK
Y
OK
16