Lenovo S930 Manuel d'entretien - Page 20
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LENOVO S930 Cellphone Service Manual
3.7 Device will not turn on.
Device will not
turn on.
Check whether the power-on key is soldered
properly or has a dry joint problem?
Is there a big current when power supply of
motherboard is the phone's only power
source?
Can U2104 work properly at the
frequency of 26MHz?
Can X1301 work properly?
Replace main chip U1201.
N
Y
N
N
Y
N
Y
Page 20
Y
Re-solder.
Motherboard is damaged.
Replace motherboard.
Troubleshoot the faulty
board.
Repair soldering,
and try again.
Repair soldering or
replace X1301.