Lenovo A516 Manuel d'entretien - Page 23

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Repair Manual of Lenovo A516 Mobile Phone

3.7 Power-on failure

Failed to Power-on

Check whether the power key FPC is

assembled well , reassembling the

power FPC ?

Power on the phone on separate main

board , whether there is high current?

Check whether the 26MHz on

U2106 is normal? Whether there is

26MHz signal on R2116?

Check whether X1303， C1319，

C1324 are well welded

Check whether the main power supply of U1301

is normal?

（VCORE,VAPROC,VDD18,VTCXO,VDD25_

VA1,VDD28,VMC, etc.）

Replace the main chip U1101

Re-weld

The main board is damaged;

replace the main board and check

the failure board step by step

Re-weld and recheck

Re-weld

replace

device

U1301

recheck