Philips BTM2360/ALL - Troubleshooting: No USB

YES
NO
YES
NO
YES
YES
NO
NO
YES
NO
YES
NO
YES
Check R27，R48，U1，U2's
FOCUS,TRACK signal，Check
Q2 is with LD signal，
loader and main board 's
Check USB socket if with 5.2V
voltage or not
Check L43 if with 5.2V
voltage or not
Look into if with focus action
and laser output or not
Disc is running or not
Check R29，U1，U2's SPINDLE
signal and 6PIN soft flat
CD Reading ok
Check 1st feet of U20（USB_SW)
if with low level or not
Check U1
Check Q301，Q302，main
board and display board's
USB connecting wire.
Check DM,DP signal if normal or
not
Check L15，L16，ZD1，
ZD2,U1，U20 etc components
USB reading OK
Refer to A's maintenance
method
E: NO USB