LG LG511C Service Manual page 78

LN510
1
2
Replace U1501 and then check C1505, R1501.
Figure 4.2.1 (a)
LG Electronics Inc.
Checking Flow
Checking Flow
Start
Check U1501 pin3
is it 19.2 MHz? (Refer to
Figure 4.2.1 (a))
NO
Check U1501 pin4
is it 2.85V? (Refer to
Figure 4.2.1 (b))
YES
Is it similar?
NO
Replace Main B/D
Waveform
Waveform
VCTCXO circuit is OK.
YES
The Problem may be Logic part
NO
VCTCXO circuit is OK.
YES
7 /168
See next page
to check control signal.
Refer to Logic troubleshoot
See next page
to check control signal.
Figure 4.2.1 (b)