LG LH-CX640 Series Service Manual page 30

3-13
(4)
When
the
Video
signal
doesn't
appear
o n
the
screen
in REC
Mode,
Is the EE
signal normal?
Is
5.2VT/5.3VAapplied
to
the
IC301
Pins24,42,55,72,91?
Does the
RF
signal
appear
at
the
IC301
Pin78?
Check
EE
Mode.
Check
the
System
of
REC
'H'. (the IC501
Pin47
/
the
D301)
Replace
the
IC301.
Checkthe
line
of
the
5.2VT/
5.3VALine.(Power
Circuit)
Check PB
Mode.
Is the
REC
'H'
signal
(about
4V)
applied to
the
IC301
Pin80?
Check
the
circuit
of
the
IC301
Pins85,
86.
Check
REC
Luminance
Pass &
Color
Pass.
Does
PB
Mdoe
operate
normally?
Does
the
REC
RF
signal
appear
at
the
IC301
Pins88,89,94,95?
Check
the
Drum
&
Drum
Connector
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
YES
YES
YES