Wcdma Forecast; Rssi_Cal; Tpc_Cal - Lenovo A516 Service Manual

Repair Manual of Lenovo A516 Mobile Phone
If it is possible to repair the complete set, the output power of each module on
transmission channel can be detected through spectrum analyzer probes when keeping the
phone in the constant state of maximum power. Under normal circumstances,
A. About GSM 33dBm and DCS/PCS 30dBm output power can be detected on the
output end of RF connector.
B. About 3dBm output power can be detected on matching circuit C2101 and C2102 of
PA input end;
C. About 32dBm or 29dBm output power can be respectively detected on pin14
connection of PA output end;
D. About 3dBm output power can be detected on pinA11 and pinB8 of Transceiver
(U2101) output end.

4.4 WCDMA forecast

4.4.1 RSSI_Cal

Fault: RSSI fails
Cause: There are problems in receiving channel
Repair manner:
RSSI_cal
RSSI Fail？
Whether TX module U2102
and RF connector CON2101
are in cold solder joint?
Check whether High Band(L2232,C2232,
C2234,L2233,L2234,C2233,U2201)or
Band(R2256,C2248,L2241,U2207,C2249,C2250
,L2243) and the surrounding circuit devices are
in cold solder joint or partially pasted

4.4.2 TPC_Cal

Fault: TPC fails
Cause: There are problems in transmission channel
Y
Y
N
Y
Low
Re-weld
Re-weld
34