LG PX8700 Service Manual page 43

PX8700
4.1.1.4 Checking RF Signal path (Mobile S/W, Triplexer, Duplexer)
Test Point
U103. Pin2
DP101
U104. Pin7
C1034, L111
C173
LG Electronics Inc.
U104
C1063, L185
Checking Flow
Check U103 Pin 2
Check if there is
Detected Signal?
Any Major Difference
◆ Refer to Graph 4.1.1(e)
Detected Signal?
Check U104 Pin 7
Check if there is
Detected Signal?
Any Major Difference
◆ Refer to Graph 4.1.1(f)
Detected Signal?
Check DP101 Pin 3
Check if there is
Detected Signal?
Any Major Difference
◆ Refer to Graph 4.1.1(g)
Detected Signal?
RF Signal Path is OK.
See next Page to check
RX I/Q data signal.
No
Changing U103
Yes
No
Check C101
Yes
No
Changing U104
Yes
No
Check
C1063&L185
Yes
No
Changing DP101
Yes
No
Check
C1034 & C173
L111
Yes
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