LTE RF transmission failure
Check whether the RF
connection cable is normal
and whether the antenna
spring is in good contact
End
Replace U3202
Replace U3401, U3501,
and U3701
End
End
Yes
Yes
No
No
Yes
Yes
No
No
Yes
Yes
No
No
Replace U3801
Replace U3301
No
Yes
Is the failure rectified after the related
circuit is replaced?
Are the
wired specifications
normal?
Is the failure
rectified after the software is updated to
the latest version?
Spot-check the
output RF signals of U3701, U3401, and
U3501 based on the non-signaling transmission of the
frequency band. Are the signals
normal?
Is the RF PA power
supply normal?
Replace the filter
on the corresponding circuit based on the
abnormal frequency band. Is the failure
rectified?
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