LG VX9100 Service Manual page 67

VX9100
Check if there is any major difference referring
Check if there is any major difference referring
referring to Figure 4.2.1(e ).
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Only for training and service purposes
Start
Check pin23(TP1) at U109
To Figure 4.2.1(c ). Is it similar?
YES
Check I/Q data(TP2) at U109
To Figure 4.2.1 (d ). Is it similar?
YES
Check pin1(TP3) at U109(TX_ON )
whether it is higher than 2.5V.
YES
Check pin15(TP4) at U109(TCXO )
YES
Check pin2, 3, 4(TP5) at U109
Referring to Figure 4.2.1(f) Is it similar?
YES
Replace U109
Checking Flow
Checking Flow
YES
NO
NO
Is it similar?
NO
NO
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RFT6150 circuit is OK. See next page
Check U 202 MSM6550
Check TX_ON signal & MSM
Check TCXO circuit.
Check SBI signal line & MSM
LGE Internal Use Only