Apple Cinema Display (20-inch) - 1
Symptom Charts
Symptom Charts
How to Use the Symptom Charts
The Symptom Charts included in this chapter will help you diagnose specific symptoms
related to the product. Because cures are listed on the charts in the order of most likely
solution, try the cures in the order presented. Verify whether or not the product continues
to exhibit the symptom. If the symptom persists, try the next cure.
Note: If you have replaced a module, reinstall the original module before you proceed to
the next cure.
Note: Referring to the Block Diagram in this manual may be helpful.
Blank screen
This symptom may indicate a problem with the LCD panel, inverter board, main board, or
related cables or connectors.
1. Check ADC cable. Replace cable if damaged.
2. Check for bent pins in the ADC connector. 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.
3. Plug the display into a known-good computer with a known-good video card and ADC
display port. Boot the computer and allow enough time to finish booting.
4. If the power button on the display is flashing, two short flashes then a long flash, in a
delayed repeating pattern, this indicates trouble with either the inverter board or
related cables or connectors. With this in mind, continue with the troubleshooting
steps to determine the problem.
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