Ionic 2 directory structure

when your image is located in www/img
– then you should reference it as img/logo.png from your HTML files
– or as ../../img/logo.png from your SCSS files.

this worked properly on my iPad and iPhone5. Try this one…this will work on both ionic serve and real devices

As I already mentioned approach in above reply (edited one), refer this forum answer by one of the ionic team member: