Lenovo P70-A Servicehandleiding - Pagina 20
Blader online of download pdf Servicehandleiding voor {categorie_naam} Lenovo P70-A. Lenovo P70-A 41 pagina's.
Pagina afdrukken
Repair Manual of Lenovo P70-A Mobile Phone
4.7
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 X801
is normal? Whether there is 26MHz
signal
Check whether X801 is well
welded
Check whether the main power supply of U503 is
normal?
（VCORE,VPROC,VIO18,VTCXO,VIO28,VRF
28,VRF18,VMC, etc.）
Replace the main chip U503
N
N
N
Y
N
Y
Y
19
Y
Re-weld
The main board is damaged;
Y
replace the main board and check
the failure board step by step
Re-weld and recheck
Re-weld and recheck
N
Re-weld
replace
device
U301 to recheck
or