2. home-theater
  3. 1117492585

Panny plasma Vs Comcast HDTV, HELP


Hey folks. Need some help here

I got myself a Panasonic 42in plasma, model # TH-42PD50U
I have 2 ways i have been trying to watch the TV

Currently, i have the HD box set up passing HD through the component (comcast HD boxes DO pass 1080I through component)to the plasma. Also, i have the COAX from the HD box connected to the COAX input on the Plasma.

When watching the source through the COAX input, i am unable to get the HD (as expected). When watching standard definition programming i can use the aspect button to switch from Full, Just, 4:3, and ZOOM to find the best way to view the program. on the 4:3 there are grey bars on the sides, and the other 3 methods will stretch the pic in different ways so i can select which is the most desireable.
However, NONE of the menu's will be displayed, i cannot get the channel guide to show up through the COAX input.

When watching the source through COMPONENT, i am able to recieve 1080I signals, everything looks crisp and lush, however, on standard definition channels the picture is broadcast 4:3 aspect to the TV. This results in the black bars on the left and right side.
The TV has an ASPECT button, however, when watching through COMPONENT the ASPECT button DOES NOT WORK. The TV will not go into Zoom, Full, Just, or 4:3 mode.
When watching the HD channels it WILL go 16:9, the 4:3 HD signals will show the grey bars on the side, or some wierd moving pattern with channel logo's and stuff depending on the channel. When watching 16:9 aspect the entire screen is used and works as it should, and i should also add, it looks SPECTACULAR. The channel guide and menu's from the cable box WILL show up.
The biggest pain in the ass is that the SD WILL NOT fill the whole screen, and the ASPECT controls do not work, meaning that if i get a wide-screen movie on demand, then i have black bars on the TOP, BOTTOM, LEFT, AND RIGHT of the screen!!!

So, as a work around, when i am watching an HD channel i watch through the component, and when watching SD i watch through the coax so i can use the aspect mode to fill the screen. When searching the channel guide i have to flip back to the COMPONENT input

My buddy has a Panasonic CRT HDTV with the same box, he uses the HDMI and his TV will broadcast widescreen in widescreen, and his Aspect control WORKS with the SD. He doesent seem to have this problem.

Does anyone have this TV? Have you used it with HDMI?
Im thinking that i might need an HDMI-to-DVI cable in order to be able to use the ASPECT button with the SD in order to fill the screen.

Ugh, i hope this isnt too confusing, but it is complicated to explain.

Basically

Watching from COMPONENT
ASPECT button WILL NOT WORK, SD is broadcast with black bars, without the use of the Aspect i fear i might get burn-in.
The cable guide DOES DISPLAY

Watching from COAX
ASPECT button DOES work, HD does not, and the channel guide DOES NOT SHOW UP.

Is there any way i can have my cake and eat it too? Should i get the HDMI cable? I really dont want to blow another 100 bucks just to find out that doesent work either.

Ugh... why cant i just have 1 input that will show the cable guide, have full use of the aspect button, and get HD?

ALSO, My denon 2900 connects to the Denon 3805 via COMPONENT, then to the TV via component, the aspect does NOT work with the DVD player either.... im starting to think the aspect function will work with coax but NOT COMPONENT, maybe it will work with HDMI?
slappy
edesilva
768 posts
 
To summarize a little, I believe component is inherently 16x9, so that when you use component, aspect conversion is done by the box sending the component signal--whether DVD or STB. "Aspect" isn't any standard convention, so what your friend's TV may have is a "zoom" feature for 16x9 images.

I've got a Pio 16x9 plasma and Comcast service, but my region (Alexandria, VA) uses the Scientific Atlanta boxes. Some other areas, including the adjacent DC market, use Motorola boxes. The thing to do is run a search on the box model over at AVS Forum--http://www.avsforum.com--and you should find a thread on how to get to some "not-for-Joe-bag-o-donuts" settings on your STB. You can also try the mfr's website. You want to make sure your STB knows what resolutions, for example, your TV likes. When I watch OnDemand, I get blackbarred SD 4x3 stuff, but I do get widescreen when the movie is widescreen, so there is something funky going on.

If your box happens to be a Scientific Atlanta box (either an 8250HD or 8300HD, I've got some experience with those. Both of those are HD DVR boxes, however. Also be warned--some of the SA boxes have a DVI out, but it may not be functional. While I like the digital video interfaces with my TV, DVI and HDMI can be a PITA b/c of HDCP.
swampwalker's avatar
Ag insider logo xs@2x
swampwalker
5,132 posts
 
Try avsforum.com. But ask them to tone it down; those guys make us 'files look like "joe-bag-o-donut".
cinematic_systems
282 posts
 
:)

You're kidding me right?

Here's some hints:

"My buddy has a Panasonic CRT HDTV with the same box, he uses the HDMI and his TV will broadcast widescreen in widescreen, and his Aspect control WORKS with the SD."

The keyword is HDTV and something your TV is not.

"When watching the source through the COAX input, i am unable to get the HD (as expected). When watching standard definition programming i can use the aspect button to switch from Full, Just, 4:3, and ZOOM"

What is the max resolution of the coax input?...285-325 lines

The TV has an ASPECT button, however, when watching through COMPONENT the ASPECT button DOES NOT WORK. The TV will not go into Zoom, Full, Just, or 4:3 mode.

What resolution is the Component input from the cable box... 1080i? Keep in mind the black bars are generated by the cable box. So to strech an image would require more or less resolution than your TV has?, this goes for DVD too......you're out of dots brother, you only have 480x752.

Cake and eat it= +$1000 for an HDTV plasma not an EDTV

Got to read them directions and replace all the power cords for best results :)

PS: Have no idea why your menu won't pass thru the RF connection. Cable companies can be silly sometimes when it comes to chizzling customers for more money.
edesilva
768 posts
 
Sorry Cinematic_Systems, play again.

I've owned the commercial version of the TH-42PD50U. It is HDTV compatible, meaning fully capable of receiving HD signals in 1080i or 720p. The internal scaler then downconverts to the displays maximum resolution. This isn't so unusual, since most plasmas aren't exactly a 1:1 ratio of pixels to HD resolution--its just that in this set the display loses a little more of the information. The monitor will display a 1080i or 720p signal to the best of its ability.

The problem is that 1080i and 720p are *inherently* widescreen. The manual sez that the aspect button does not work with 1080i or 720p input signals. See p. 21. Its not a matter of running out of pixels.

The double boxing problem is an STB issue or a Comcast issue. Try using the S-Video to watch SD/AD (but not HD) off the box; should give you back the aspect/zoom at least. Frankly, some prefer the use of S-Video over component/DVI/HDMI because it tends to "blur" the picture a tiny bit and mask the resolution conversion problems.
nerspellsner
41 posts
 
Does your CATV box also have a aspect control? If it does,set it to full. Make sure its not set to 4:3. If it is set to 4:3 your TV might not display SD in a widescreen stretch mode regardless of the aspect setting on the TV. Make sure the screen type control on the CATV box is set to 16:9 and not 4:3. Send a full signal to the TV and use the TV aspect control to make it look the way you want. Does the CATV box upconvert all signals from the component video outputs to 1080I? If it does your aspect ratio control on the TV will not work. Try not using the coax cable to feed the TV. Use just the component cables or try using 2 inputs with a S video cable and see which one looks better with SD.
More to discover