LENOVO S960 Cellphone Service Manual
Page 14
3.3.2.2 SN audio power amplifier
Check PMU chip U1301. If it’s damaged,
replace it.
Check whether audio power amplifier U1401
on motherboard has a dry joint problem or is
damaged. Repair soldering or replace it. Try
again to see whether it rings.
N
Replace speaker. Retry to see whether it
rings.
Y
OK
Y
OK
It does not ring.
N
Check whether the connections of the
main FPC connectors are OK.
Y
OK
Check whether analog switch U1403 on
motherboard has a dry joint problem or is
damaged. Repair soldering or replace it.
Try again to see whether it rings.
Y
OK
N
Y
OK
Check whether the contacts between the
speaker spring clips and the sound
chamber stand are good.
Replace the sound chamber stand.
Y
N
N
