LG -D385 Service Manual page 76

3.2.2.5 Checking RF signal path (TX Module)
START
Check TP1(C1101) at U1100
Check if there is any major difference referring
To Figure 3.1.1(b). Is any signal detected at that
point?
Check TP2(C1638) at FL1601
Check if there is any major difference referring
To Figure 3.1.1(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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3. TROUBLE SHOOTING
Check L1101,C1100, L1142, SW1100
Check TP3(C1123),TP4(C1124),TP5(C1119),
TP6(C1120) at U1100. Is any DC signal detected
at that points?
Replace U1100
Check C1638
The Problem may be Logic part
Refer to Logic troubleshoot
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Only for training and service purposes
No
Yes