Lenovo A859 Service Manual - Page 29

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Repair Manual of Lenovo S920 Mobile Phone

4.3.2 High Frequency Error



Fault: Frequency Error exceeds standard in complete set test.



Cause: There is problem in VAFC input circuit of TCXO.



Shooting:

Excessive

Recalibrate

Check whether U2104 is in cold

solder joint or damaged

Replace the elements in

joint



Fault: Phase Error exceeds standard in complete set test.



Cause: The capacitors of power supply part of PA and transceiver are in cold solder joint

or in short circuit with other resistance.



Shooting:

Frequency Error

cold solder