LG CM9530 - System Part

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ELECTRICAL TROUBLESHOOTING GUIDE
2. SYSTEM PART
Power on.
FRONT board OK.
Check 25p FFC cable.
Check SMPS board.
Check FFC cable.
Check MAIN board.
Check SMPS board.
Replace DIG301.
Replace LED
(LD351 ~ LD366).
Check MAIN board.
“HELLO”
Display on FLD
OK?
Volume LED
LD351 ~ LD366
Turn on?
When turn
the volume, count is
change?
NO
NO
NO
NO
NO
NO
NO
NO
CN105
cable connection
OK?
CN302
Pin13, 19, 20, 22
OK?
CN352
Pin7, 8 signal
OK?
CN301
Pin14~17 data signal
OK?
CN301
Pin13, 19, 20, 22
power OK?
YES
YES
YES
YES
YES
YES
YES
YES