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8. Level 3 Repair
Check soldering
status(U2102) and the
voltage at
C2081,C2003,C2077=0.8V,
C2002=0.875V,
C2008,C2007=1.7V,
C2086,C2087=1.2V
8-4-31. GSM1800/1900, CDMA BC1, WCDMA 1/2/4, LTE B1/2/3/4/7/25/30/38/40/66 DRX
END
Resolder or change
ANT2004, ANT2003, V2010
Resolder or change
F2004
Resolder or change
L2015
Resolder or change
U2102
Resolder or change
UCP500
No
No
No
No
No
No
NO
NO
Yes
Yes
Yes
Yes
Yes
Yes
Receiver is O.K?
Resolder or change
C2139, C2141, C2146
No
Yes
Yes
Check V2010
≤
-65dBm ?
Check L2046
≤
-65dBm ?
Check component
soldering status ok?
F2004
Check L2015
≤
-65dBm ?
Check component soldering status OK at
U2100
Check C2139, C2141, C2146
≤
-65dBm ?
Resolder or change
C2072, C2017, L2046
Resolder or change
U2100
NORMAL CONDITION
Catch the channel?