LG MX8550 Service Manual page 46

MX8550
Check if there is any major difference referring
To Figure 4.1.1 (e). Is any signal detected at
Check if there is any major difference referring
To Figure 4.1.1 (f). Is any signal detected at
Check if there is any major difference referring
To Figure 4.1.1 (g). Is any signal detected at
RF signal path is OK. See next page to Rx I/Q data signal
LG Electronics Inc.
Checking Flow
Checking Flow
Start
Check pin2 at U101
that point?
YES
Is any signal detected at
that point?
YES
Check pin6 at F105
that point?
YES
Is any signal detected at
that point?
YES
Check pin3 at DP100
that point?
YES
Is any signal detected at
that point?
YES
Replace U101
NO
Check C103, L103
NO
Replace F105
NO
Check L104, L139
NO
Replace DP100
NO
Check L117, C126, L125, C136
NO
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