Hello, Great Infos here. Few weeks ago I bought a Cinema Display 24” for a cheap price because it didn’t work. I followed the Apple Technician Guide : the LCD was working but not the LEDs. No backlight. Voltage at the check points was Ok on the mother card. I checked the LEDs inside the display and they seemed old to me, one was even broken. As I couldn’t find any replacement part, I finally bought another display for about 150€, almost brand new one. I replaced it today and it is the same story, no backlight ; the LCD is still working though, like the old one. I was sure the LEDs were down but obviously, the problem is elsewhere. Probably the logic board I think (?). Or could it be something else, power supply, cable ?? Just to say beware of the Apple Technician Guide, it is bullshit. I just wasted my money because of it. Now I have to buy a logic board to try it out and it is not really cheap…