Specifications

LED Cinema Display (24-inch) Symptom Charts — Input/Output Issues 31
2010-02-08
Input/Output Issues
USB Issues
Unlikely cause: LCD panel, blower, subwoofer, speakers
Quick Check
Symptoms Quick Check
USB Issues
External USB device(s) not •
recognized
Wired USB keyboard/mouse •
not recognized
Verify display’s USB and Mini DisplayPort 1.
connectors are plugged into known-good
supported system.
Launch System Proler and conrm that display’s 2.
USB hub is visible.
Deep Dive
Check Result Action Code
Verify display’s USB and Mini 1.
DisplayPort connectors are
plugged into known-good
system.
Yes Go to step 2.
No Connect display’s USB and
Mini DisplayPort cables.
Verify USB uplink cable 2.
connection to logic board
is secure. See Functional
Overview.
Yes If connections are secure and
USB ports still do not function
correctly, go to step 3.
No Reseat connector and retest.
Disconnect USB cable from 3.
logic board and system. Inspect
connectors and cable under
magnication for pinched
cables and damaged/bent pins.
Yes
Replace all-in-one cable. M15
No Replace logic board. X04
Verify USB device and cable 4.
function properly on a known
good system.
Yes Go to step 7
No Go to step 6.
Inspect all three USB ports on 5.
display under magnication for
damaged/bent pins.
Yes USB ports damaged.
Go to step 7.
No Verify USB peripheral works
on known-good display.