Lenovo P70-A Manuel d'entretien - Page 22

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Repair Manual of Lenovo P70-A Mobile Phone

4.9

Radio frequency (RF)

4.10

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-on be turned on.

Check whether USB connector is

in cold solder joint

Check whether TCXO （X801）

is oppositely pasted?

Whether baseband chip MT6752

（U401） is oppositely pasted

Whether flash U701 is

oppositely pasted

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

Re-weld USB connector or

use another KB to verify it

Re-weld X801

Re-weld U401

Re-weld U701