Harman JBL BAR 2.1 - USB Port Not Functioning

USB cannot w
ork
USBcann
otwork
Go
Insteadof
new24pinline
Checkthe24pincable(XP7)t
omainboardof
connect
y
esornot.?
Re
place the old with the new AU board to
theEUTworking.
Replacethe
AUboard. 
No
Yes
No
Yes
Checkfrom
mainboardtheU14isnormal?
（SYS_5V_ADC、SYS_3V3_ADC）
Replacethe
U14
YES
ReplacePCBA
formainboard.
NO
5-6