LG VX8610 Service Manual page 66

VX8610
Check if there is any major difference referring
To Figure 4.2.1(c ).
Check if there is any major difference referring
To Figure 4.2.1 (d ).
Check pin1(TP3) at U111(TX_ON )
Check pin15(TP4) at U111(TCXO )
referring to Figure 4.2.1(e ).
Referring to Figure 4.2.1(f) Is it similar?
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Only for training and service purposes
Checking Flow
Checking Flow
Start
Check pin23(TP1) at U111
Is it similar?
YES
Check I/Q data(TP2) at U111
Is it similar?
YES
whether it is higher than 2.5V.
YES
Is it similar?
YES
Check pin2, 3, 4(TP5) at U111
YES
Replace U111
RFT6150 circuit is OK. See next page
YES
Check U 204
NO
Check TX_ON signal & MSM
NO
Check TCXO circuit.
NO
Check SBI signal line & MSM
NO
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MSM6550
LGE Internal Use Only