LG MX8550, Service Manual

Page: 58 / 190

- 57/148 - LG Electronics Inc.
M X8550
Checking Flow
Checking Flow
Check pin2 at U101
Check if there is any major difference referring
To Figure 4.1.1 (e). Is any signal detected at
that point?
Start
Replace U101
YES
RF signal path is OK. See next page to Rx I/Q data signal
NO
Is any signal detected at
that point?
Check C103, L103
NO
Check pin6 at F105
Check if there is any major difference referring
To Figure 4.1.1 (f). Is any signal detected at
that point?
YES
Replace F105
NO
YES
Is any signal detected at
that point?
Check L104, L139
NO
Check pin3 at DP101
Check if there is any major difference referring
To Figure 4.1.1 (g). Is any signal detected at
that point?
YES
Replace DP101
NO
YES
Is any signal detected at
that point?
Check C135, C127, L126, C134
NO
YES
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