LG VX10000 Service Manual page 79

VX10000
Replace U1010 and then check R1029 , R 1021.
Figure 2.2 (a)
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Only for training and service purposes
Checking Flow
Checking Flow
Start
Check U1010 pin3(TP1)
Is it 19.2MHz? (Refer to
figure 2.2 (a))
NO
Check U1010 pin4(TP2)
Is it 2.8V? (Refer to
figure 2.2 (b))
YES
Is it similar?
NO
Replace Main B /D
Waveform
VCTCXO circuit is Ok . See next page
to check control signal .
YES
The Problem ma y b e Logic part
R efer to Logic troubles hoot
NO
VCTCXO circuit is Ok . See next page
to check control signal .
YES
Waveform
Figure 2.2 (b)
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