Installed new display, appearing as 3840x2160 instead of 5120x2880
Let me start by saying that if you can figure this out you're a genius....
I recently cracked the screen of my late 2014 5k iMac and had to shell out on buying a new replacement screen for it. The screen i purchased is this one:
I had a local repair shop install the new screen for me and its working fine however there is some weirdness which I can't for the life of me understand.
1. When i go to 'About this Mac>Displays' it lists the resolution as '3840x2160' instead of 5120x2880.
2. However when i go to system information in OSX it is listed as a 5120x2880 retina display.
3. If i go to 'preferences>displays' and click the 'default for this display' checkbox it switches it to a setting which 'looks like 1080p'. However on my previous screen when you clicked this checkbox it would use 'looks like 2560x1440'.
4. The scaling options and resolutions are different to what they were with the previous screen. My maximum resolution scaling i can select now is '3360x1890' whereas on my old screen it was '3200 x 1800'. '2560x1440' is also now classed as a scaled resolution.
Now i know most of this points towards the display not being the same, however it is the same from all the searching i've done. There have only ever been two versions of the iMac 5k to my knowledge, the late 2014 one (my one) and the late 2015 one.
If the display is not 5k why is it listed in OSX's system information screen as being 5k ?
One thing someone elsewhere mentioned is that 3840x2160 is the maximum supported output for external monitors connected to the iMac 5k... he suggested that perhaps via some bizarre circumstance the mac is thinking it's an external monitor and thus limiting its max resolution to 3840x2160 ? but then this doesn't explain why its listed as a 5120x2880 monitor in system information screen.
Thoroughly confusing, I honestly don't understand whats going on and was hoping someone here may be able to shed some light on it all.
Here are some images showing what i mean
about this mac>displays : http://oi67.tinypic.com/1567mkj.jpg
preferences>displays : http://oi65.tinypic.com/2q8byqf.jpg
system information : http://oi64.tinypic.com/6fmnit.jpg
Is this a good question?