LG -D100F Service Manual page 26

3.1.1.3 Checking RF signal path(PAM)
START
Check TP1(C1104) at U1100
Check if there is any major difference referring
To Figure 3.1.1(b). Is any signal detected at that
Check TP2 at U1100
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?
PAM is OK. See next page to check DPX
LGE Internal Use Only
point?
Yes
point?
Yes
Yes
No
Check anything
No
Is any DC signal detected at that points?
No
Check anything
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3. TROUBLE SHOOTING
Yes
Replace U1100
The Problem may be Logic part
Refer to Logic troubleshoot
Only for training and service purposes
No