Just wanted to post that i have had many issues with the backlight failing on my Apple LED Cinema Display 27'. While Michael and others on this post have commendable electronics skills, on my display, I have localized the problem to be with the All-In-One Cable. Swapping out power supply and logic boards did nothing to solve my intermittent problem of the backlight going out. But swapping out the cable solved it for me. My display is 5-years old and I am currently on my fourth All-In-One cable (922-9362). It's a poor design. The cable seems to last for about 12-18 months and then starts going out intermittently without any major event happening. Why someone would combine a USB, Power, and Mini-Display into a single cable is beyond me. Except that they can charge $140. Cables are typically reliable and usually be able to be taken for granted. 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Installation can stall with the message, Please insert the. Cannot install VMware Tools in a Mac OS X Server virtual machine if there is. You do want to check your logic board over and see if you find any bulging or leaking capacitors. Just because the power /sound/etc. May be there, you can also not rule out the power supply. It may not supply the power to the LED backlight. You will need to check on that as well, take a good luck on the logic board. There should also be a fuse for the backlight, which may have failed. Post a couple of hi-res images of your logic board with your question, so we may look at it and see if we can come up with something more concrete. I would also suggest that you try the Apple Deep Dive for Blank / No Video, No Backlight: Check Result Action Code 1. Connect display to AC power source. Connect Mini DisplayPort, MagSafe and USB connectors into a known good, supported, powered-up portable. Verify display’s USB hub and built-in camera are listed in the System Profiler’s USB device tree. Yes Power is available to the display logic board, and USB communication working. Go to step 2. No Go to Dead Unit/No Power. Unplug and replug Mini DisplayPort connector into a known-good, supported, powered-up portable system and monitor the portable’s display. Verify that the portable’s display briefly turns off then back on. Yes LCD is powered and detected by system. Go to step 7. No Suspected no power to LCD panel or no DisplayPort connection with system. Go to step 3. Remove glass and LCD panel screws, slightly pivot LCD panel and verify that the internal DisplayPort cable (part of all-inone cable) and function cable are fully connected to LCD panel and logic board. Yes Go to step 4. No Reseat DisplayPort connection to LCD panel and/or function cable connections between logic board and LCD panel and retest. If issue persists go to step 4. For any damaged cable, replace affected cable before testing again: - all-in-one cable. - function cable. Unplug and replug Mini DisplayPort connector into a known-good, supported, powered-up portable system and monitor the portable’s display. Verify that the portable’s display briefly turns off then back on. Yes LCD is powered and detected by system. Go to step 7. No Suspect no power to LCD. Replace function cable and retest. If issue persists go to step 5. Replace all-in-one cable and reinstall LCD. Unplug and replug the Mini DisplayPort connector into a knowngood, supported, powered-up portable system and monitor the portable’s display. Verify that the portable’s display briefly turns off then back on. Yes LCD panel powered and detected by system. Go to step 7. No LCD panel still not detected by system. Suspect no LCD power from logic board. Go to step 6. Usb elicenser nexus 2. Replace logic board and reinstall LCD. 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Yes LCD panel powered and detected by system. Go to step 7. No LCD panel still not detected by system with replaced function cable, all-in-one cable and logic board. Suspect LCD panel video input damage. Replace LCD panel. If the Blank/No Video/No Backlight issue persists, darken room and connect to a knowngood supported system. Verify backlight is present by looking for faint glow from display. Yes LCD panel powered, detected by system and backlight is ON but there is no video on LCD. Replace LCD panel. No LCD panel is detected by system but no backlight. Check whether video is present on LCD. Go to step 8. Shine bright (low heat) flashlight into the front of the LCD. And verify if any image is being displayed.
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