Download Apple A1267 Specifications

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
1. Verify display’s USB and Mini DisplayPort
connectors are plugged into known-good
supported system.
2. Launch System Profiler and confirm that display’s
USB hub is visible.
Deep Dive
Check
2010-02-08
Result
Action
Code
1. Verify display’s USB and Mini
DisplayPort connectors are
plugged into known-good
system.
Yes
Go to step 2.
No
Connect display’s USB and
Mini DisplayPort cables.
2. Verify USB uplink cable
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.
3. Disconnect USB cable from
logic board and system. Inspect
connectors and cable under
magnification for pinched
cables and damaged/bent pins.
Yes
Replace all-in-one cable.
M15
No
Replace logic board.
X04
4. Verify USB device and cable
function properly on a known
good system.
Yes
Go to step 7
No
Go to step 6.
5. Inspect all three USB ports on
display under magnification for
damaged/bent pins.
Yes
USB ports damaged.
Go to step 7.
No
Verify USB peripheral works
on known-good display.
LED Cinema Display (24-inch) Symptom Charts — Input/Output Issues 31