Samsung UN55MU7000FXZA Manual page 43

Disassembly and Reassembly
3. Removing the 'Rear Cover'.
3-1. Insert Open Jig in a Disassembly
furrow to Open the furrow.
And Move Open Jig to the side.
3-2. Continue moving the Open Jig
to the 'Open Direction' to lift 'Hook'