Vizio E231-B1 - User Manual - Manual (Page 11)

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3. Using a Phillips screwdriver, tighten four (4) T4 12mm screws
into the base to secure it to the TV.
When you are finished, place the TV on a stable, level
surface. To ensure proper ventilation, leave at least 1” of
space between the back of the TV and any other objects
(walls, etc).