LG LH-CX640 Series Service Manual page 62

3-69
A
RESET
or
Power
On.
YES
YES
YES
YES
B
YES
YES
YES
YES
YES
Show
LOGO?
Flash
Memory
operates
properly?
Check
connection
lines between
FLASH
&
MT1389 and the
FLASH
access
time
whether
is suitable
or not.
SDRAM
works
properly?
Check
connection
lines between
SDRAM
&
MT1389 and the
SDRAM is
damaged.
MT1389
VIDEO outputs
properly?
Check the
related circuit of
MT1389.
Have
TV
signal output?
Check the
filtering
and amp
circuit of
TV
signal.
Check AV cable connection
to
TV
set.
Does
Tray
move
inside
when
it is not
at
closed
position?
Normal
TROUT
&TRIN
signals?
Check the
load
OPEN
&
CLOSE
switch
Normal
TRCLOSE
&
TROPEN signal?
Normal
LOAD+
&
LOAD-
signal?
Check the
cable
connection
between
main
PCBA
and
loader.
Check the
Tray control IO pins on
MT1389
&
IP4504.
Check the
Tray control
amplifying
circuit on Motor driver.
NO NO
NO
NO
NO
NO
NO
NO
NO