LG HT806TGW Service Manual page 60

ELECTRICAL TROUBLESHOOTING GUIDE
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
MT1389FE/GH
VIDEO outputs
properly?
YES
Check AV cable
connection to TV set.
Normal
NO
OPEN_SW,
CLOSE_SW
signal?
YES
Normal
OUTSW & IN_SW
signal?
YES
Normal
LOAD+ & LOAD-
signal?
YES
Check FFC cable connection
between main PCBA and
loader. (MECHA)
2-49
Check connection lines between
NO
FLASH & MT1389FE/GH and the
FLASH access time
whether is suitable or not.
Check connection lines between
NO
SDRAM(IC503) & MT1389FE/GH
and the SDRAM is damaged.
NO Check the related circuit of
MT1389FE/GH IC500 Pins139,
143, 146, 146.
NO
Check the load OPEN &
CLOSE switch.
NO
Check the Tray control IO pins
on MT1389FE/GH.
NO
Check the Tray control MOTOR
& SERVO circuit IC400.