Test & Debug Flow - LG MDD262 Service Manual

2. TEST & DEBUG FLOW
Power ON
Show LOGO?
YES
Does
tray move
inside when it is at
closed position?
YES
B
Flash
NO
memory operates
properly?
SDRAM works
properly?
ES8380
VIDEO outputs
properly?
Check AV cable
connection to TV set.
OPEN_SW &
NO
CLOSC_SW signals on
PIN401 are OK
OPEN / CLOSE
signals on IC401 are
OK?
Load+ & load-
signals on P4480
are OK?
Check the cable
connection between DVD
PCB and MD (MECHA)
4-2
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
Check connection lines
between FLASH & ES8380 or
the FLASH access time whether
is suitable or not.
Check connection lines
between SDRAM (IC502) &
ES8380 or the SDRAM is
damaged.
Check the related
circuit of ES6698FD (IC501)
PIN133,134,137,138,139,140
Check the MD mecha
Check the output signal
of ES8380 to IC401 for
control OPEN / CLOSE
Check the tray control
I/O PIN on IC401.