Lenovo P70-A Service-Handbuch - Seite 16

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Repair Manual of Lenovo P70-A Mobile Phone

4.5

Keyboard and keyboard backlight

4.5.1 Abnormal operation of side keys

Check whether there are conditions like cold

solder joint and short circuit on keyboard

FPC ? Whether it is ok after re-welding?

Check whether there are conditions like cold solder

joint and missing device on the circuit device of side

keys and power key .

( R1806,R1807,D1802,D1803,R1801,D1801,C1801 )

Abnormal side key

FPC is fracted, Replace

side keys FPC

Replace U401/U503