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Led cinema display brightness control3/17/2023 Apple ASD which is only available at a service center. If you have followed ALL these simple steps, there is a possibility that your monitor has a logic board problem that can only be verified through use of an AHT** if you are lucky enough to have one or. The no brightness control condition varies from computer to computer.įor example, this problem on a Mac Pro appears as no Brightness control slider at all and no Auto brightness adjust check box at all.įor others this may appear as grayed out. (don't forget to try a restart after changing settings) In some cases selecting Sound output as something other than Display Audio can help clear up a USB conflict. In any case, make certain that the monitor USB connection is made through one means or another. Sadly, this may mean that your only verification is use of Display Audio as the Sound output. Go to system preferences Sound and choose an Output option other than monitor USB (Display Audio).įor those who use wireless keyboard and or mouse the monitor USB connection must be verified by some means. It should also be noted that another setting should also be attempted. This makes and breaks ground momentarily and typically re-establishes USB connection. If there is no connection (as silly as this sounds) try wiggling the USB cable at the rear of the monitor until a connection is made. Make certain the USB connection is made before trying anything else.ĭo this by using a keyboard or mouse attached to the monitor USB ports. This is due to the anodization of the chassis. It is also worth noting that the 27" LED Cinema DisplayPort equipped monitor HAS problems with monitor USB connections. In short, make certain the monitor USB cable is attached befire running this repair tool or trying to control brightness. There is no brightness control without the monitor USB cable attached and there is not supposed to be. It is not noted or emphasized that for this to work properly OR for brightness control to work properly, the monitor USB cable MUST be attached. This portion of the AHT will repair no brightness control on a repaired monitor and actually is required when repairs to the internal logic board are performed.
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