LG -D385 Service Manual page 29

3.1.1.3 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
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
Is any signal detected at
that point?
TX module is OK. See next page to check DPX
LGE Internal Use Only
point?
Yes
point?
Yes
Yes
No
Check L1101,C1100, L1142, SW1100
No
Check TP3(C1123),TP4(C1124),TP5(C1119),
TP6(C1120) at U1100. Is any DC signal detected
No
Check C1638
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3. TROUBLE SHOOTING
at that points?
Yes
Replace U1100
The Problem may be Logic part
Refer to Logic troubleshoot
Only for training and service purposes
No