We bought a new (what used to be called a table model) TV and didn't have a stand to put it on (our old TV was a console projector), so I got busy in the shop.   The TV weighed about 120# plus I wanted a DVD player, video input (Satellite, or Uverse), a center speaker, and possible an receiver/amp (AVR weight 40#) on the stand so it had to be strong.   I used mortise and tenon constructon in the entire frame except for the top and shelf laminations which I used biscuits (loose tenon).   The top is made of edge laminated 2X8 yellow pine and the frame's legs and cross supports under the shelves are 1 1/2" square pine.   The shelves are made of edge laminated 3/4" pine.   All vertical and horizontal frame members use mortise and tennon glued joints.   Shelves and top edge laminations use #20 biscuit joints, shelves and top also use #20 biscuits in the joint to the frame supports.   In the rear is a 1 X 12 stiffener which helps to maintain the stand's rectangular dimension (prevents parallelogram collapse).

The TV and stand from the front (yes, I need to clean up the cables).

Closer view of just the stand.

Right top view

Right front view of bottom shelf.

Left end of top.

Left end of bottom shelf.

Rear stiffener

Stiffener top detail, notice how its mortised into the table top.

Stiffener middle shelf detail.