Agc - Lenovo A516 Service Manual

Repair Manual of Lenovo A516 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：
GSM fail
C2117,L2101,
L2103,L2104,L2105,
L2106 are welded
with disconnection？
Re–weld
C2117,L2101,
L2103,L2104,L2
105,L2106
Re–weld U2101
or U1101
⚫
Notes: Remeber to recalibrate after replacing compements.
GSM、DCS all fail？
DCS fail
C667,L2102,
L2107,L2108,L2109,L
2110 are welded with
disconnection？
Re–weld
C667,L2102,
L2107,L2108,L2
109,L2110
Re–weld U2101
or U1101
28
Y
Check whether RF
connector CON2101 is
in cold solder joint?
N
Whether U2102 is in
solder joint?
cold
N
Whether U2102 is in
solder joint?
cold
？
N
Re–weld U2101
or U1101
Y
Re–weld
CON2101
Y
Re–weld
U2102
Y
Re–weld
U2103