Ambient light sensor is not working (full display assembly)

Thanks Rick for your response;

Just a short update: received a replacement display assembly from ifixit - same problem. Everything works but the ambient light sensor (well, it might work but the preference switch for auto-brightness is still off). Since I am using this phone 'productively', I didn't want to play around too much with it and test things out.. I was hoping someone else had the same issue and knew how to 'easily' fix it..

All I found on the web was that it seems that only the original cable works in some cases - which for now I refuse to believe, otherwise ifixit would have had many more returns?

You can take the front camera assembly from the old display and transfer it to the new one.

It's not rare that you get defective parts on pre-assembled screens which have the front camera, earpiece and etc on them.

Thanks Ben - my original thought was that I didn't want to do this, as this would mean a high risk of breaking more than I would repair (hence the full assembly display unit and not only the glass replacement).. Still not giving up on some magic fix in the software, and not having to open the phone again ;-)