Lenovo A859 Panduan Servis - Halaman 21
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Repair Manual of Lenovo S920 Mobile Phone
Power-on failure
Failed to Power-on
Check whether the power key FPC is
assembled well , reassembling the
power FPC ?
N
Power on the phone on separate main
board , whether there is high current?
N
Check whether the 26MHz on
U2104 is normal?
Y
Check whether X1301, C1336
and C1337are well welded
Y
Check whether the main power supply of U1302
is normal?
（VCORE,VAPROC,VDD18,VTCXO,VDD25_
VA1,VDD28,VMC, etc.）
Y
Replace the main chip U1201
Y
Re-weld
The main board is damaged;
Y
replace the main board and check
the failure board step by step
N
Re-weld and recheck
N
Re-weld and recheck
N
Re-weld
or
replace
device
U1302
to
recheck
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