LG VX9100 Service Manual page 41

VX9100
Replace U107 and then check R111 , C 181 .
Figure 4.1.1 (a)
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Only for training and service purposes
Checking Flow
Checking Flow
Start
Check U107 pin3(TP1)
Is it 19.2MHz? (Refer to
figure 4.1.1 (a))
NO
Check U107 pin4(TP2)
Is it 2.85 V? ( Refer to
figure 4.1.1 (b))
YES
Is it similar?
NO
Replace Main B /D
VCTCXO circuit is Ok . See next page
YES
The Problem ma y b e Logic part
R efer to Logic troubles hoot
NO
VCTCXO circuit is Ok . See next page
YES
Waveform
Waveform
- 40 -
to check control signal .
to check control signal .
Figure 4.1.1 (b)
LGE Internal Use Only