2 - Apple Cinema Display 22" (ADC) Troubleshooting
Symptom Charts
5. To check whether the LCD is working, make sure that the display’s power light is on
(glows white). Shine a bright light such as sunlight or a high intensity lamp (see
Important note, below) into the screen and at the same time notice whether you can
see faint images of desktop items on the screen.
• If desktop items can be seen, the LCD panel is working. The problem may be with
the inverter or backlight bulbs or related cables or connectors. Continue with the
troubleshooting steps.
• If no desktop items can be seen, the problem may be with the LCD panel or the
main board or related cables or connectors.
Important: Lights get very hot and can quickly damage the display; be extremely
careful not to allow too much heat next to the screen or other parts of the display and
do not allow the light fixture to touch the screen, or damage can result.
6. Warning: The inverter board generates high voltage when the display is plugged
in. Do not touch the inverter board components, pins or connectors, when the
display is connected to the computer.
Disconnect the display from the computer, then open the display and check for
secure connections at J2, J5, J6, J4, J3 and the ADC cable connection to the panel.
Note: Refer to the Block Diagram in this manual for connector locations.
7. Plug the display into a known-good computer, then boot the computer.
8. Verify +24-28V at pin 1 of J4. If not, replace ADC cable.
9. Verify +15V at pin 1 of J2. If not, replace the main board.
10. Verify +5V at pin 1 of J5. If not, replace the main board.
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