LG CMS1530F - Usb Part

6. USB PART
Turn on USB
YES
YES
YES
YES
Check connector CON107.
Check CON107
pin2, 3 (D+, D-) signal.
Check IC801.
OK
Check power supply circuit
USB +5 V.
Check IC801 pin41, 42 (D+, D-).
Check IC700 circuit
Normal.
NO
NO
NO
NO
NO
Check
"CHECKING" or "USB"
display.
Check reading OK.
If play,
audio output
check
NO
YES
3-8
ELECTRICAL TROUBLESHOOTING GUIDE