LG PX8700 Service Manual page 50

PX8700
4.1.2.2 Checking VCTCXO Circuit
Test Point
Waveform
Graph
LG Electronics Inc.
Check X101 Pin 3
◆ Refer to Graph
4.1.2 (a)?
19.2MHz?
Check X101 Pin 4
◆ Refer to Graph
4.1.2 (b)?
+2.9V OK?
YES
Changing X101
Check C1001, C1002,
C1006, R125
Similar?
SW Download
Replace Board
Checking Flow (VCTCXO)
VCTCXO Circuit is OK .See
YES
next Page to check
Control signal.
The Problem may
be Logic part
NO Refer to Logic troubleshoot
VCTCXO Circuit is OK.
YES
See next Page to check
Control signal.
NO
Graph
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