Usb Error Correction Flow Chart - LG LCS500UN Service Manual

6. USB ERROR CORRECTION FLOW CHART

Something wrong with the USB?
Only "NO USB" or "USB CHECK" Display?
YES
Checked the USB Vdd?
YES
Checked the USB
interface IC Ground?
YES
Checked the USB
interface IC Reset?
YES
Checked the USB
interface IC X-tal?
YES
Checked
the D+/D- Port?
YES
Checked the USB
indication Port?
YES
OK
6A 6B
NO
NO
IC501(4, 5, 7, 9, 12, 44, 49, 51, 74, 77, 81,
NO
NO
NO
NO
2-14
IC302
102, 104, 116, 117)
CN520(19)
X501
IC501(52, 53)
IC501(52, 53)