LG VX8610 Service Manual page 64

VX8610
Replace U109 and then check R114 , C156 .
Figure 4.2.1 (a)
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Only for training and service purposes
Checking Flow
Checking Flow
Start
Check U109 pin3(TP1)
Is it 19.2MHz? (Refer to
figure 4.2.1 (a))
NO
Check U109 pin4(TP2)
Is it 2.8V? (Refer to
figure 4.2.1 (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 may 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 4.2.1 (b)
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