LG CT815 Service Manual page 85

4. TROUBLE SHOOTING
4.5.1 Checking TCXO Block
Refer to 1.3
4.5.2 Checking ASM(FEM) Block
Refer to 1.4
4.5.3 Checking RF TX Level
TP1
TP4
TP2
LGE Internal Use Only
TP3
TP1
TP2
TP4
Test Point (TX Level)
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TP4
TP3
Only for training and service purposes