4 - Apple Cinema Display 22" (ADC) Troubleshooting
Symptom Charts
USB device not working
1. Check for bent pins in the ADC connector (note, it is normal for two of the pins to be
slightly longer than the others). If pins are slightly bent, carefully straighten. If pins are
severely bent, replace cable. Also, inspect or have the customer inspect the display
port on the computer for broken pin dividers. If the display port is damaged it must be
repaired before inserting the ADC connector.
2. Plug the display into a computer with a known-good ADC display port, then boot the
computer. On the back of the display, connect a known-good USB device into one of
the USB ports, then check Apple System Profiler to see if it is recognized. Check both
USB ports.
Note: x+R, refreshes the Apple System Profiler list when USB devices are changed.
• If the device is recognized, the customer’s USB device may be the issue.
• If not, check the J1 USB connections and cables. If not that, replace the main
board.
Power/brightness switch not working
1. Check J5 connection and verify that the cable is connected to the power/brightness
switch cable connector.
2. Replace the rear cover (includes power/brightness switch board).
Note: The power/brightness switch board is permanently attached to the rear cover.
3. Replace main board.
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