LG KF600w Service Manual page 79

Start
Check F 104 pin3(TP1)
Is it 19.2MHz? (Refer to
figure 4.2.2 (a))
Check F 104 pin4(TP2)
Is it 2.8V? (Refer to
figure 4.2.2 (b))
YES
Replace F104 and then check R112 , C 152 .
Is it similar?
NO
Replace Main B /D
Figure 4.2.2 (a)
Checking Flow
Checking Flow
NO
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 4.2.2 (b)