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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
8-4-26. GSM 850/900, CDMA BC0/10, WCDMA B5/8, LTE B5/8/12/13/14/17/18/19/
20/26/28/29/71 RX
No
No
Yes
Yes
Check RFS 1000
≤ -65dBm
Check the ANT, Sub PBA
No
Check C1006
≤-65dBm
Yes
Resolder or change
RFS1000, C1005, L1003, C1006
No
Check C1016
≤-65dBm
Yes
Resolder or change
F1000, C1016
No
Check component
soldering status ok?
U1002
Resolder or change
U1002
No
Receiver is OK?
Resolder or change
UCP500
No
Yes
Yes
Yes
Resolder or change
U2102
No
END
Check C1018
≤-65dBm
Resolder or change
C1018