The exact fix may depend on how you're getting the show onto TV, but TVs always
cut off a bit.

Create a slide with regularly spaced lines to form a grid and put that on the
TV.  

Note where your grid gets cut off; that's the edge of your TV safe area.

Make sure anything important on your slides fit inside that area.

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Steve Rindsberg, PPT MVP
PPT FAQ:  www.pptfaq.com
PPTools:  www.pptools.com
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The screen aspect ratio is the same with some computer screens and  TV.  The
screen ratio is 4:3, but some computer screens use a 16:9 screen ratio or
one of the multitude of non-standard ones out there.  First I would check
that the output to the TV is set to a 4:3 ratio.

Secondly, there are a lot more pixels displayed on the average computer
screen when compared to a TV.  In fact, standard TV has shockingly poor
resolution, about 720 × 480 (this varies widely from about half of this in
older TV's to over three times higher in HDTV).  You tend not to notice it
as much because of the motion and the brains ability to "fill in" the
missing bits.  However, if you send 800 pixels in width to a TV that can
only handle 720, you may find the leftovers are cut off.

Your choices are to:
1) Change the computer's output to a resolution supported by your TV
2) Buy a VGA to TV adapter that will interpret the signal sent by the
computer to one the TV can use
3) Use a monitor instead of a TV