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14. Check the USB hub circuit
14.1 Hub isn't recognize
Is a cable with the host PC connected
NG
Is a USB cable connected with the monitor?
NG
Is a 5V supplied to I201 Pin1?
NG
Is a 3.3V supplied to I201 Pin3?
NG
Doesn't 3.3V to J202 pin3
NG
OK
" Proceed section 14.4 Check the USB IC "
Failure point
I201
Doesn't R201 open
NG
Failure point
R 2 0 1
Printed wire breaks
between R201 and J202
Failure point
USB cable disconnection
Failure point
USB cable disconnection
Doesn't Q203 open
NG
OK
Doesn't R232 open
NG
OK
Doesn't R235 open
NG
OK
Doesn't Q204 open
NG
OK
Doesn't R233 open
NG
OK
Doesn't I203 open
NG
OK
Proceed section 14.5
"Check the power supply"
NEC-FA150ATUA
Failure point
Q 2 0 3
Failure point
R232 open
Failure point
R 2 3 5
Failure point
Q 2 0 4
Failure point
R233 open
Failure point
I203
Trouble Shooting
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