LG LH-T3520X Service Manual page 15

A
YES
Power On.
YES
Show LOGO?
YES
Does
Tray move inside when it
is not at closed
position?
YES
B
Flash
NO
Memory operates
properly?
YES
SDRAM
works properly?
YES
MT1389/L
VIDEO outputs
properly?
YES
Check AV cable
connection to TV set.
Normal
NO
OPEN_SW,
CLOSE_SW
signal?
YES
Normal
TROPEN & TRCLOSE
signal?
YES
Normal
LOAD+ & LOAD-signal?
YES
Check AV cable connection
between main PCBA and
loader. (MECHA)
2-6
Check connection lines
NO
between FLASH &MT1389/L
and the FLASH access time
whether is suitable or not.
Check connection lines
NO
between SDRAM(IC504) &
MT1389/L and the SDRAM
is damaged.
Check the related circuit of
NO
MT1389/L IC501 Pins99, 102,
103, 104.
NO
Check the load OPEN &
CLOSE switch.
NO
Check the Tray control IO pins
on MT1389/L.
NO
Check the Tray control MOTOR
& SERVO circuit IC401.