LG OM7550 - System Part

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ELECTRICAL TROUBLESHOOTING GUIDE
2. SYSTEM PART
Power on.
FRONT, TOP board OK.
Check FFC cable.
Check FFC cable.
Check MAIN board.
Check SMPS board.
Replace DIG3E11.FL+/- & VKK voltage OK?
Check MAIN board.
“HELLO”
Display on FLD
OK?
When turn
the volume, count is
change?
NO
NO
NO
NO
NO
NO
NO
CN605
cable connection
OK?
Check
CN605 pin5, 6
I2C data OK?
CN605
pin8, 9, 10 data signal
OK?
CN605
pin7, 14, 15, 16 power
OK?
YES
YES
YES
YES
YES
YES