Lenovo A859 Service Manual - Page 25
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Repair Manual of Lenovo S920 Mobile Phone
4.2.2 AGC
Fault: AGC calibration Fail.
Reason: RF test cable is not connected well during calibration; the devices in receiving
cable are in cold solder joint (such as RF connectors, antenna switch, saw the filter and
the surrounding capacitance).
Shooting：
N
GSM frequency
band fails?
N
Whether C2130,L2102is in
Y
Re-weld
cold solder joint?
Whether Rx is in
Re-weld/Replace
cold solder joint?
coupler
N
Whether differential pathare
Y
Replace the
in cold solder joint?
welding
N
Check the transceiver chip
MT6166(U2101U601)and
the baseband chip
Notes: Remeber to recalibrate after replacing compements.
Rx path lo
calibration fails
Check calibration report to see
whether the two frequency
bands fail?
Y
Y
Whether C2117,L2101 is
Re-weld
cold solder joint
in
N
Whether Rx is in cold
Y
Re-weld or
solder joint?
replace
N
Whether
L2104,
L2105,L2106
Y
d solder joint?
are in col
N
U1201
25
Y
Check whether RF cable
and
fixtures
are
well
connected?
Y
Check whether RF
connector CON2201
is in
cold solder joint?
N
Re-weld or
Whether
R2115,C2131
replace
solder joint?
in cold
N
Reconnect and
calibrate
Y
Re-weld
CON2201
is
Y
Re-weld