Lenovo S930 Servicehandleiding - Pagina 25

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LENOVO S930 Cellphone Service Manual

Check whether U2104 is damaged or has a

dry joint problem.

4.2.3 Phase Error is too big.

⚫

Problem: Phase Error is over the limit in whole-unit test.

⚫

Reason: Capacitors in power feeding circuits of PA module and transceiver have dry joint

problems. Or there's short circuit between these capacitors and other resistors.

⚫

Troubleshooting:

Phase Error is over the limit.

Check power feeding circuits of PA (U2102) and Transceiver

(U2101).

Replace components

which have dry joint

problems.

Frequency Error is over

the limit.

Re-calibrate.

Replace components which

have dry joint problems.

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