Fault In Complete Set Test/ Rework; Switch Spectrum & Pvt Template With Excessive Standard - Lenovo P70-A Service Manual

Repair Manual of Lenovo P70-A Mobile Phone
4.12

Fault in complete set test/ rework

4.12.1 Switch spectrum & PVT template with excessive
standard
Fault: The switch spectrum and PVT template of GSM and DCS frequency bands are
excessive.
Cause: The cold solder joint or damage to components in V_ramp of PV may result in the
excessive switch spectrum.
Shooting:
Switch spectrum and
Mask with
Measure to see whether the voltage of PA is in the normal
range (1.8V or less)?
Check whether the input and output
matching is in cold solder joint?
Replace the elements in
solder joint
Replace PA if necessary
Ramp
excessive standard
cold
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