LG MX8550 Service Manual page 54

MX8550
Replace X100 and then check C152, R107.
Figure 4.1.1 (a)
LG Electronics Inc.
Checking Flow
Checking Flow
Start
Check X100 pin3
Is it 19.2MHz? (Refer to
figure 4.1.1 (a))
NO
Check X100 pin4
Is it 2.8V? (Refer to
figure 4.1.1 (b))
YES
Is it similar?
NO
Replace Main B /D
Waveform
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
Figure 4.1.1 (b)
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