Here is a link to the service manual for your laptop.
http://www.hp.com/ctg/Manual/c03943414.pdf
On p.19 it shows an exploded view of all the components for your laptop. Your problem seems to be with the base enclosure.
On p.23 it gives the HP part number for the base, 720534-001.
If you search online, using ''just'' the number, (nothing else, not HP or Envy 15 etc.) you will get suppliers for the base.
Here is a link to just one supplier. It is only shown to give you an idea of the price. Search around you will probably find one closer to where you are and maybe cheaper.
Hi,
Here is a link to the service manual for your laptop.
http://www.hp.com/ctg/Manual/c03943414.pdf
On p.19 it shows an exploded view of all the components for your laptop. Your problem seems to be with the base enclosure.
On p.23 it gives the HP part number for the base, 720534-001.
If you search online, using ''just'' the number, (nothing else, not HP or Envy 15 etc.) you will get suppliers for the base.
Here is a link to just one supplier. It is only shown to give you an idea of the price. Search around you will probably find one closer to where you are and maybe cheaper.
http://www.ebay.com.au/itm/NEW-HP-Envy-15J-15-J000-15-J100-Bottom-Base-720534-001-US-seller-/111665656538
The manual will help you to correctly dis-assemble and re-assemble your laptop when replacing the base enclosure.