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8. Level 3 Repair
NORMAL CONDITION
Catch the channel?
Check soldering status(U22000)
and the voltage at
C22045,C22021,C22001=0.8V,
C22028=0.875V,
C22019,C22008=1.7V,
C22043,C22031=1.2V,
C22042=1.8V
8-4-43. LTE B48 TX
Yes
No
Yes
Check C113
≤ -65dBm
Resolder or change
ANT101, V102, C113
No
Check C154
≤-65dBm
Yes
Resolder or change
U103, C114, L114,
F100, C103, C154
No
Check L21021
≤-65dBm
Yes
Resolder or change
C21089, C21023, F21002, L21021
No
Check component
soldering status ok?
U21006
Resolder or change
U21006
No
No
Resolder or change
UCP500
No
Yes
Yes
Yes
Resolder or change
U22000
No
END
Check C21060
≤-65dBm
Resolder or change
C21060
Receiver is OK?
