"On the 171MP unlike the 170MP the TV-tuner is an optional feature. This is most likely because if you are going to take advantage of the fact that this monitor is HDTV ready you will need to use a set top box anyways which works as the tuner. The term "HDTV-ready" means a higher resolution monitor, but requires a digital set-top box to decode 720p or 1080i digital HDTV signals. It will work as-is with regular television (if the optional tuner is installed), laser discs, and DVDs."
FULL STORY @ IAMNOTAGEEK (http://www.iamnotageek.com/cgi-bin/reviews.cgi?name=s171mp&p=1)