Phase Error Is Too Big - Lenovo S930 Service Manual

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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