Partially dim screen

This symptom indicates a problem with the inverter or backlight bulbs on the side of the display that is dim , or related cables or connectors. This may be caused by the backlight bulbs or the inverter not working properly. 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...

Before Working on the Display

Connector Shielding With Hinge

Warning There is a risk of electric shock, fire or other hazard, if the Inverter Board, ADC Cable, MLB to USB Socket Cable, and the LCD Display Module are not replaced with the correct Apple service part. Warning Unless otherwise instructed in the service procedures, to avoid the risk of electric shock, fire or other hazard, disconnect the ADC connector from the computer to ensure that the display is not receiving power during service. The display LCD and the inside and outside of the case can...

Warning The inverter board generates high voltage when the display is plugged in Do not touch the inverter board

Disconnect the display from the computer, then open the display and check for secure connections at TMDS, Panel Power, J703, J701, J702, J12, CN1, CN2, CN3, CN4 and CN5. 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 input of J702. If not, replace ADC cable. 9. Verify 24-28V at pin 10 of J701. If not, replace the main board. 10. Verify 5V at pin 11 of J703. If not, replace the...