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8. Level 3 Repair
NORMAL CONDITION
Catch the channel?
Check soldering status(U2102) and
the voltage at
C2081,C2003,C2077=0.8V,
C2002=0.875V, C2008,C2007=1.7V,
C2086,C2087=1.2V
8-4-40. LTE B7/38/41 TX
No
Yes
Yes
Check RFS 1001
≤ -65dBm
Check the ANT, Sub PBA
No
Check C1010
≤-65dBm
Yes
Resolder or change
RFS1001, C1010, C1034, C1112
No
Check L1307
≤-65dBm
Yes
Resolder or change
F1303, C1306, L1307
No
Check component
soldering status ok?
U1004
Resolder or change
U1004
No
No
Receiver is OK?
Resolder or change
UCP500
No
Yes
Yes
Yes
Resolder or change
U2102
No
END
Check C1048
≤-65dBm
Resolder or change
C1048