Lenovo S930 Manual de serviço - Página 23
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LENOVO S930 Cellphone Service Manual
module's RF input circuits are shifted, and shield bracket is short circuit.
⚫
Troubleshooting:
Did GSM
frequency
band fail?
Y
PA input R2105
has a solder
Re-solder.
short problem.
Y
Does PA(U2102) have
Re-solder.
a dry joint problem?
Check RF receiver and transmitter MT6166(U2101) or baseband chip U1201.
⚫
Note: Normally you need to re-calibrate the corresponding components after the replacement.
N
Check the calibration report
to see whether every
frequency band failed.
N
DCS/PCS
frequency
band failed.
Y
Y
Does PA input R2105
have a solder short
problem?
N
N
Does PA(U2102)
have a dry joint
problem?
N
N
PCL calibration
failed.
Y
Y
Replace
corresponding
components.
Y
Re-solder.
Page 23
Is AGC calibration
normal?
Y
Y
Does PA module
(U2102) have a dry
joint problem?
N
Do APC circuit
(R2111,R2112) have
dry joint problems?
N
N
Analyse
AGC at
first.
Re-solder.
Y
Re-solder.