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The backlight of my MacBook (1.1) was flickering. It was very annoying, so I looked up, what could cause the problem. I found out, that it has to be the inverter or it's cable. I bought both to be on the save side.
The repair was a lot of fun and pretty easy too. The guides helped me a lot and my MacBook is now fully working again!
And btw, I installed a newer OS on it and build in a SSD. It runs like it's new.
So many different screws! Make sure you have a system to organize them.