LG -E445 Service Manual page 75

4.2.2.5 Checking RF signal path (TX Module)
START
Check TP1(C110) at U102
Check if there is any major difference referring
To Figure 4.1.1(b). Is any signal detected at that
point?
Check TP2(C176) at FL104
Check if there is any major difference referring
To Figure 4.1.1(c). Is any signal detected at that
point?
Is any signal detected at
that point?
TX module is OK. See next page to check DPX
LGE Internal Use Only
No
Yes
No
Yes
No
Yes
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4. TROUBLE SHOOTING
Check L102,C110, SW101
Check TP3(C179),TP4(C180), TP5(C181),
at U102. Is any DC signal detected
at that points?
Yes
Replace U102
Check C176
The Problem may be Logic part
Refer to Logic troubleshoot
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Only for training and service purposes
No