LG D686 Service Manual page 72

3.4.1.3 Checking RF signal path (PAM)
Check TP1(L104) at U102
Check if there is any major difference referring
To Figure 4.2.1.4 Is it similar ?
Check TP2 at U102
Check if there is any major difference referring
To Figure 4.2.1.4 Is it similar ?
Check TP3(R103),TP4(R104),TP5(R105),
at U102. Is any DC signal detected
at that points?
Replace U102
LGE Internal Use Only
START
Yes
No
Yes
No
Check anything point
Yes
PAM circuits OK See next page.
No
The Problem may be Logic part
Refer to Logic troubleshoot
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3. TROUBLE SHOOTING
Only for training and service purposes