Download Apple A1267 Specifications

Sleep/Wake Issue
Unlikely cause: LCD panel, blower, subwoofer, speakers, camera, microphone
Quick Check
Symptoms
Quick Check
Sleep/Wake Issue
• Won’t go to sleep or wake up
from sleep
1. Verify display is being used with supported
system.
2. Use with known-good system. If used as second
display, check display preferences to see if display
is recognized by system.
3. Verify USB/display/power connectors are fully
seated.
4. Check brightness setting.
Deep Dive
Check
2010-02-08
Result
Action
1. Verify display’s USB hub and
built-in camera are listed in the
System Profiler’s USB device
tree.
Yes
Power supply OK.
Go to step 3.
No
Go to step 2.
2. Verify voltage on logic
board between J0121 Pin 1
(24.5VDC) and Pin 3 (GND) is
23.3–25.7 VDC.
Yes
Power supply OK.
Go to step 3.
No
No power at logic board.
Go to step 4.
3. Unplug and replug the Mini
DisplayPort connector into
a supported powered-up
portable system and monitor
the portable’s display. Verify
that the portable’s display
briefly turns off then back on.
Yes
Logic board OK.
Go to step 6.
No
Go to step 4.
4. Verify all connections between
power supply, all-in-one cable,
and logic board are secure. See
Functional Overview.
Yes
If connections are secure and
display still does not function
correctly, go to step 5.
No
Reseat connectors and retest.
Code
LED Cinema Display (24-inch) Symptom Charts — Startup and Power Issues 21