Question about Proscan 47LB45H 47 in. LCD TV

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Jerky video on antenna feed of ABC network programming

I receive all Birmingham network broadcasts via my tower antenna and all broadcasts are OK except for ABC channel 40.1 HD. It turns out that this is the only broadcast that comes in at 720p. All further comments are specific to this ABC station which is the only problem I have.

Most of the local ABC broadcasts I receive (Local New, daytime SOAPS and most other broadcasts are received well on my ProScan TV, however specific primetime shows like "Grey's Anatomy", "Private Practice" and other popular primetime broadcasts result in a jerky video presentation where there are frequent brief image pauses throughout the programs.

I have another HD TV (a 32 inch Samsung) that receives the same antenna feed and it does not have this problem with the ABC primetime programming.

I've looked at all of the available menu settings and I do not see any options that might cure the problem.

Do you have any idea why I am having this problem? This ProScan TV is new and I have a couple of weeks to decide whether to return it to Sears for a trade-in or a refund, so I'd appreciate your help quickly.


Dennis Thornburgh

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You didn't say so but I believe the TV you're using that having the problem is a TV that uses motion compensating frame interpolating technology... a common feature with 120hz and 240hz LCD TVs. I have one of these types of TVs and I have this issue with ABC as well. ABC has begun dropping video frames from some of their primetime shows (the ones that start at the 8e/7c time slot seem most effected) to speed up the broadcast to a point where they can get an extra commercial in. On normal TVs, including the older 60hz LCDs, this is not really noticeable. However, for the motion compensating frame interpolating technology, the TV's video processor must sync up with the 'telecine' processing (conversion from the originally filmed 24fps to broadcast 60fps) so that it can eliminate the copied frames that the telecine processing produces before it can create the interpolated frames between the original frames. When the TV's processor hits a missing frame, it loses sync and has to rejoin and causes the jerky motion you're seeing.

For a solution, you can turn off the motion compensating frame interpolation tech on your TV. Each manufacturer calls it something different but the name will have something to do with smoothing out motion like 'Smooth Motion'. In this case, you need it off for the motion to be it's smoothest (not the case with most TV though).

For a better solution, send a complaint to ABC and your local ABC affiliate.

Posted on Sep 28, 2009


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