Quite a common and very annoying problem. I see it often, even with FTA (Antenna) TV now. I don't think the 59 cable comes into play here. Many TV's have user sync adjustments in their menu. Here is some info on that issue.
the following is a snippet of the wikipedia article in the link below:
A/V sync errors are becoming a significant problem in the digital television industry because of the use of large amounts of video signal processing in television production, television broadcasting and pixelated television displays such as LCD, DLP and plasma displays.
In the television field, audio video sync problems are commonly caused when significant amounts of video processing is performed on the video part of the television program.
Typical sources of significant video delays in the television field include video synchronizers and video compression encoders and decoders. Particularly troublesome encoders and decoders are used in MPEG compression systems utilized for broadcasting digital television and storing television programs on consumer and professional recording and playback devices.
A source of significant video delay is found in pixelated television displays (LCD, Plasma display, DLP) which utilize complex video signal processing to convert the resolution of the incoming video signal to the native resolution of the pixelated display, for example converting standard definition video to be displayed on a high definition display. "Lip-flap" may exceed 200 ms at times.
In broadcast television, it is not unusual for lip-sync error to vary by over 100 ms (several video frames) from time to time.
http://en.wikipedia.org/wiki/Audio_to_video_synchronization
Re: Delay between sound.
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