Lenovo A859 Service-Handbuch - Seite 23

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Repair Manual of Lenovo S920 Mobile Phone

1. Radio frequency (RF)



Faults: Software can't be normally downloaded.



Reason: Baseband chip is oppositely pasted or is in cold solder joint; CRYSTAL is

oppositely pasted (no clock signal) or is in cold solder joint.



Shooting:

Software can't be normally downloaded or the

phone can't Power-onbe turned on.

Whether baseband chip MT6582

（U1201） is oppositely pasted

Check whether U2101 is

in cold solder joint

Check

whether

（U2104）is oppositely pasted?

Separately check whether U2104 is in cold solder joint?

Re-weld the elements in cold solder joint



Re-download software when it is normal after replacing elements,.

Re-weld U1201

Re-weld U2101

TCXO

Re-weld U2104