Lenovo A516 Service Manual - Page 31

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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.

⚫

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