LG 501C, Service Manual

Page: 64 / 170

LG Electronics Inc.
LG501C
Checking Flow Checking Flow Checking Flow
Figure 4.2.1 (a)
Figure 4.2.2 (b)
Waveform
Check TP1 X2201B pin 3
Is it 19.2MHz? (Refer to
figure 4.2.1 (a))
NO
Start
Replace Main B /D
VCTCXO circuit is Ok . See next page
to check control signal .
The Problem may b e Logic part
R efer to Logic troubleshoot
YES
NO
NO
Check TP2 X2201Bpin 4
Is it 2.8V ? ( Refer to
figure 4.2.1 (b))
Replace X2201B and then check C2201B
YES
Is it similar?
VCTCXO circuit is Ok . See next page
to check control signal .
YES
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