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Coaxial vs S-Video

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Old 04-02-2008, 02:32 PM   #1
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Default Coaxial vs S-Video

I have a LG 42" Plasma TV. It works great for DVDs and fairly good when I watch TV. I'm subscribed to standard digital cable.
Here's my question:
I recently bought an S-Video cable in attempt to improve the picture when watching TV, because I'm currently using a coaxial cable. From what I've heard, S-Video is supposed to be far superior to coaxial. Now that I'm using the s-video cable, the picture quality is horrible! Can anyone offer any suggestions as to why?

Thanks!
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Old 04-02-2008, 02:51 PM   #2
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Don't confuse the coax cable coming in from the cable co. with an RCA composite output from the cable box.

If you do have digital cable service, you need to use either an HDMI or component cables to your display. S-Video will not provide you with a video signal that can be processed digitally by your display.
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Old 04-02-2008, 06:11 PM   #3
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Quote:
Originally Posted by daleb View Post
S-Video will not provide you with a video signal that can be processed digitally by your display.
That makes no sense.

S-video will send an analog 480i signal to the TV.
The TV certainly has the capability to process this signal, convert it to digital and display it.
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Old 04-02-2008, 06:21 PM   #4
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Quote:
Originally Posted by mark31 View Post
I have a LG 42" Plasma TV. . . . I'm subscribed to standard digital cable.
Here's my question:
I recently bought an S-Video cable in attempt to improve the picture when watching TV, because I'm currently using a coaxial cable. From what I've heard, S-Video is supposed to be far superior to coaxial. Now that I'm using the s-video cable, the picture quality is horrible! Can anyone offer any suggestions as to why?
Depends on what you mean by "coaxial" and what cable box you are using.

S-video should look pretty good; certainly better than composite (the yellow RCA type cable); but not as good as component or HDMI. What options does your cable box offer?

You may want to review the information in this link to help you understand better.
http://lyberty.com/encyc/articles/svideo.html
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Old 04-02-2008, 09:40 PM   #5
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Originally Posted by Scottnot View Post
That makes no sense.

S-video will send an analog 480i signal to the TV.
The TV certainly has the capability to process this signal, convert it to digital and display it.

Wow! What an observation!


He already said he was getting a picture...duh!

Not the one he expects.
Only HDMI or components output will provide a signal of sufficient quality for watching digital cable on his display.
My bad for not wording it more appropriately!
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Old 04-03-2008, 08:59 AM   #6
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My cable box only offers a coaxial or s-video option. I'm unable to use component or HDMI (not that it would matter because I don't have HD TV).
Maybe I'm a little confused with my termanology. The cable that comes out from the wall into my cable box is called a coaxial? I have the exact same cable coming out of the cable box going into the TV, which I assume is also called a coaxial?
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Old 04-03-2008, 09:23 AM   #7
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Quote:
Originally Posted by mark31 View Post
My cable box only offers a coaxial or s-video option. I'm unable to use component or HDMI (not that it would matter because I don't have HD TV).
Maybe I'm a little confused with my termanology. The cable that comes out from the wall into my cable box is called a coaxial? I have the exact same cable coming out of the cable box going into the TV, which I assume is also called a coaxial?
Yes, your terminology is correct. And excuse the internal scuffle above. Sometimes we get cranky at each other here and go off on a tangent. .
Anyway, not sure why your S-video is yielding such poor results. With SD, S-video should be your best connection option over coax and composite usually. Not HUGE, but at least as good and usually noticeably better. Perhaps the S-video cable or 1 of the S-video ports are bad on the TV or STB. Try a new cable if you can. Also make sure 1 of the 4 pins on each end of the cable are not bent/broken.
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Old 04-03-2008, 03:17 PM   #8
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Quote:
Originally Posted by mark31 View Post
I have a LG 42" Plasma TV. It works great for DVDs and fairly good when I watch TV. I'm subscribed to standard digital cable.
Here's my question:
I recently bought an S-Video cable in attempt to improve the picture when watching TV, because I'm currently using a coaxial cable. From what I've heard, S-Video is supposed to be far superior to coaxial. Now that I'm using the s-video cable, the picture quality is horrible! Can anyone offer any suggestions as to why?

Thanks!
Mark31, what type(s) of tuner(s) is/are included in your TV. A 42" Plasma is a digital TV and will have a digital tuner (if there is NO tuner; it's not a TV, but a monitor)-- Have tried to connect the cable IN coax directly to the TV w/o using the STB to see what sort of picture you get-- and what channels you get? Try it, if you haven't already.

I suspect you will get your best results with the coax from the STB if it has ONLY S-video and coax. How do you connect your DVD player to the TV?

It may be that your DIGITAL STB is just a QAM/DIGITAL tuner/decoder-- and it just sends the digital signals to the TV's digital tuner. You will know for sure when you connect the cable directly to the TV . . . Good luck. Keep us update. Some bright people here (not me) can help, but they need more detailed information. Model numbers for the STB and TV can help a lot.
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