LG DP372 Service Manual page 16

A
RESET or power on.
Show LOGO?
YES
Does tray
move inside when
it is not at closed
position?
YES
B
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Flash
NO
memory operates
properly?
SDRAM
works properly?
138PDE/LP
VIDEO outputs
properly?
Have TV
signal output?
Check AV cable
connection to TV set.
Normal
NO
OPEN_SW & CLOSE_SW
signals?
Normal
OPEN & CLOSE
signal?
Normal
FAN_TRAY+ & FAN_TRAY-
signal?
Check the cable connection
between main PCBA and loader.
3-5
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
amplifying circuit on Motor driver.
YES
Check connection lines between
FLASH & MTK1389DE/LP and
the FLASH access time whether
is suitable or not.
Check connection lines
between SDRAM &
MTK1389DE/LP and the
SDRAM is damaged.
Check the related circuit
of1389DE/LP.
Check the filtering and
amp circuit of TV signal.
Check the load
OPEN & CLOSE switch
Check the Tray control IO pins
on 1389DE/LP & AM5898N.
Check the Tray control
LGE Internal Use Only