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I opened a ipod nano 6 to fix the powerbutton, but now 1/3 of the display is dark. but if i wipe with the finger on the darke part, it becomes colour. It looks like i wipe a liquid. Does someone now what the problem is? Thanks for your help!!!

Michael Jenni, from your description, it sounds like you have a broken LCD. You will have to replace it to fix your iPod. Remember that the LCD is non-separable from the digitizer. You will need a new front panel assembly. Follow this guide for the repair. The part is available right here. Hope this helps, good luck.

You have was is referred to as a bleeding screen or crack:) This is fairly simple to replace. buy one online, googled: iRefresh repair Digi There’s plenty of sites out there!