Remove the grate,it may be prudent to remove the surround as well as some screws which you will be removing later are at angle from the back.The glass is held in by the 2 corner beads which in turn are fixed by 3 screws each side from the back,do not push the screws as you are extracting them otherwise the beads will fall out breaking the glass.The beads have lugs that will keep them in place until you pull them out from the front while holding onto the glass.
The PCB ( printed circuit board ) is accessible after the black cover plate is removed ( 2 black screws ) It is fixed with 2 screws from the back again
toptrish, October 2014
