It's the ribbon front and centre in your first photo. You need to follow it underneath the flexi-PCB which is visible in your second photo immediately under the LCD. The LCD ribbon goes under that and then attaches to the rigid PCB below. It's really tricky to get it off - you have to bend the flexi-PCB out of the way GENTLY.

Glad I could help a few people - my GR1's shutter bit the dust the other day so mine is properly dead now - unless someone knows how to fix it!!!