Lenovo VIBE X2 Servicehandleiding - Pagina 10
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3. Troubleshooting Procedure
3.1 No boot
Cannot boot
Check the Key FPC assembly
&Change the power key FPC
Give the 4v on the PCBA vbat pin but not
power on the phone, is there any
Overload current() in the PCBA?
Connect the phone to the computer through
the USB line, check the computer device
manager if there is equipment pops up.
Check the 19.2MHz crystal is
normal?
Check the battery connector
SMT is normal?
Check PMIC provide power supply
to CPU and EMMC are normal?
Change memory chip U1502
Y
N
N
N
N
Y
N
Y
Y
the phone can power on, the
root cause is Key FPC.
Y
PCBA is bad,
change it.
Y
Download software and
try power on it again.
Check the crystal SMT is normal?
Heat the crystal then try it again.
Heat the battery connector
then try it again.
N
Heat the PMIC or
change the PMIC.
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