LG MDD64K Service Manual page 31

3. USB PART
TURN ON USB
Check "Searching" or
"USB" Display
Check Reading OK
OK
YES
YES
YES
NO
Check the POWER supply circuit
Check the HRST # signal
Check the USB and DVD part
NO
Check the USB part supply
Check the USB data line (CN205)
Check the ES8390
(Check DATA LINE pin98_USB_NO, 99_PO)
3-16
(Check P201)
YES
YES
(CN205)
YES
YES