23" Apple Cinema HD Display does not turn on - no blink
About a year ago I bought a used Apple Cinema Display 23” (A1082) and a Cinema Display 90W power adapter (A1097). The screen has been working flawlessly until recently, when the screen stopped working. In the beginning, although the screen didn’t turn on, the power lamp would light up, when the power button was touched. Now the light is completely switched off.
What I find particularly weird is that whenever I plug the Cinema Display’s USB connector into my laptop and my external Apple USB Keyboard into the Cinema Display’s USB inputs, the external keyboard is fully functioning and able to control my laptop. I guess this could mean that the screen does get power to some extent and is not fully dead? I wanted to test the power adapter with a multimeter, but does this mean that I need to take the power adapter apart to do so?
I’ve tried ‘the Jacobeon method’ (covering the middle pin with tape) with no success. Furthermore, I’ve considered buying a 150W adapter to test if it can make the screen work, but as I’ve only spent 35$ on the screen and 90W adapter in total I’m a bit hesitant to spend more than 50 $ on Ebay on a used power adapter that may not fix the problem. It could also be a faulty logic board….
What should I do? Can I fix it myself (I’m a rookie in electronics), should I try to get it fixed by a professional or is it more reasonable to simply toss this beautiful yet fairly old screen?