Fault In Complete Set Test/ Rework; Switch Spectrum & Pvt Template With Excessive Standard - Lenovo A516 Service Manual

Repair Manual of Lenovo A516 Mobile Phone

4.3 Fault in complete set test/ rework

4.3.1 Switch spectrum & PVT template with excessive standard
⚫
Fault: The switch spectrum and PVT template of GSM and DCS frequency bands are
excessive.
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Cause: The cold solder joint or damage to R2204,R2210 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 Pin16 of PA （U2102）
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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