Apple Cinema Display - Partially dim screen

Apple Cinema Display (20-inch) - 3
Symptom Charts
Partially dim screen
This symptom indicates a problem with the inverter board, LCD panel, or related cables or
connectors.
1. Plug the display into a known-good computer with a known-good video card and ADC
display port. Boot the computer.
2. Notice whether 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, LCD panel, or related cables or connectors (this indicator may not always be
exhibited). With this in mind, continue with the troubleshooting steps to determine the
problem.
3. 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 CN1, CN2, CN3, CN4 and CN5.
Note: Refer to the Block Diagram in this manual for connector locations.
• If the inverter cable (CN1) is damaged, replace the inverter cable.
• If any connectors on the inverter board are damaged, replace the inverter board.
• If any of the other CN cables are damaged, replace the LCD panel.