Insignia 19KK44 Service Manual page 66

（10）Fail to upgrade from USB port
Fail to upgrade from a USB port
Check if the U disk is normal ?
Yes No
Check if voltage of
Change a U disk
X306-1# is 5V ?
No Yes
Check out peripheral Check if there is a
circuits of 5V short between X306-2#/3#
No Yes
Check out main chip Check out socket