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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
8-4-31. CDMA BC1, GSM 1800/1900, WCDMA B1/2/4, TDSCDMA B34/39, LTE
B1/2/3/4/25/39/66 RX
No
No
Check C21083
≥ 23dBm
Check the ANT
Yes
Check C21007
≤-65dBm
No
Resolder or change
C21007, L21009, C21083, L21092
Yes
Check component
soldering status ok?
U21003
Resolder or change
U21003
No
Yes
No
Check L21002
≤-65dBm
Resolder or change
F21000, L21002, L21004
Yes
Receiver is OK?
Resolder or change
UCP500
No
Yes
Yes
Resolder or change
U22000
No
END
No
Yes
Check C21046, C21047
≤ -65dBm
Resolder or change
C21046, C21047
