Lenovo P70-A Manuel d'entretien - Page 32

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Repair Manual of Lenovo P70-A Mobile Phone

4.14

3G/4G comprehensive test

4.14.1 ACLR or SEM

Fault: ACLR or SEM

Cause: No calibration or PA （U901,U902） is in cold solder joint; check the Point problem circuit

components or RF transceiver (U801) doesn't work well.

Repair manner:

Whether it is OK after recalibrating WCDMA/LTE?

Re-weld PA or replace PA and the devices in

transmission circuit?

Re-weld

transceiver

4.14.2 ILPC comprehensive test abnormal

Fault: ILPC

Cause: No calibration or just passing calibration.

Repair manner: The same as 4.5.1.

4.14.3 Frequency Err

Fault: Frequency Err

Cause: No calibration, or suffered outside interference

Repair manner: Recalibrate 3G/4G and test; replace X801.

replace