I have a comcast Motorola HD capable cable box with DVI output - going through a converter cable into an HDMI input. When I change from a hi def channel to a std def channed, the screen gets split, and the left side appears on the right, the right side appears on the left. TV is a TH-42PX60U

How do I get 1080 instead of 720. - Comcast Help and Support Forums

forums.xfinity.com/t5/XfinityTV-and.../How...1080...720/.../1152741

Jan 3, 2012 - I can switch one of them from one HDMI input to the other HDMI ... The YPbPr option might be set at 720p, and you can change that to 1080i.

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From looking at the back panel of the TV, the DTV input can be configured as a component video. The M-Link/DVI-HD port is also a DVI with HDCP port and maximum signal handled is 1080i. The M-Link should work with an HDMI to DVI cable or adapter. For this to work, the source must not be a computer or another device using the default computer video output (computers give RGB output). The DTV port would need an HDMI to Component video converter. See this page for some examples: http://www.hdtvsupply.com/hdtocoad.html . The first one in the list (for Netflix and Boxee among others) will give 1080i out if the source is set correctly.

Most DVI-HDMI cables are single link. I've seen some examples where DVI-I (single link) and DVI-D (dual link) cables are not interchangeable. If you have video problems, check your cable. An HDMI to DVI adapters will let you run an HDMI cable up to the TV and then converter at the TV as a separate connection.

I hope this helps.

Cindy Wells

This really depends on the connectsionon your hi def TV. The laptop doesn't have an HDMI port (these ports carry sound and video in one cable), but it does have a VGA out port as well as a s-video out.

You can connect an s-video cable from your laptop to your hi-def TV, if the TV has an s-video input port.

You can also purchase a VGA to Component converter if your hi-def TV has component inputs, these are the Red, Green, Blue inputs. Amazon sells these, here is a link: http://www.amazon.com/Premium-VGA-Component-Cable-Black/dp/B000RJLSZU

If you have a DVI input you can purchase a VGA to DVI converter as well. These are very inexpensive and you can find a wide selection on Amazon, here: http://www.amazon.com/s/ref=nb_ss?url=search-alias%3Delectronics&field-keywords=vga+to+dvi

Finally, you can also purchase a VGA to HDMI converter. This would be the most expensive option, but you can use this box to put both sound and video from the laptop onto the HDMI cable. YOu would need both the converter and cable for this to work. Converter is here: http://www.amazon.com/VGA-Audio-HDMI-Converter-Adapter/dp/B0015YWV1G/ref=sr_1_3?ie=UTF8&s=electronics&qid=1263068538&sr=1-3
Cable is here: http://www.amazon.com/HDMI-meter-foot-cable-1080P/dp/B0002L5R78/ref=pd_bxgy_e_img_b

The hdmi port on the Comcast box is an output only and cannot be used as an input from the general public. If your tv has a DVI output, there are DVI to HDMI adapters that can make the hook up....other than that, there is the super video cable but you will still have to run audio through a seperate line.

Your TV plays High Def material through either Input 4 (uses component cables R,G,B) or through Input 5 (Uses DVI cable).
Today most equipment uses HDMI cable for High Def or it may have a component (RGB) output that you can use. The DVI hookup is best, so you need a HDMI to DVI cable or Component Cables (Red, Green, Blue). You need some source that OUTPUTS High def (ex. 1080i) either through HDMI or component cable. You need to either connect the component cable(R,G,B) from the source to the Input 4 on the TV or connect the HDMI to DVI cable from the source to the Input 5.
You need to set the AV source on the TV to AV5 (if you are using the DVI input) or AV4 (if you are using component cables).
If you want to play Highdef source like Blue Ray then you can just connect the output of the blu ray player to your Tv using either the HDMI to DVI cable or component cable (Red, Green, Blue) and set the TV input to AV5 (for HDMI/DVI) or AV4 (for component).
But if you are trying to get Free High Def from an antenna then you will need to have a component that can OUTPUT high def. The $40 converter boxes don't do this - they simply convert the Digital signal to Analog (non high def). What you need is a High Def TUNER that OUTPUTS High Def. I was looking for one for this same reason and ordered the centronics ZAT 502 HD. But it cost about $80. Then I saw that Tivo had an upgrade deal where I could upgrade my existing Series 2 Tivo to Tivo HD for $99. It has a High Def Tuner in it. So I cancelled my order with Centronics and got the Tivo. In any case if you want Over the air HD you will need a High Def Tuner that will OUTPUT 1080.

There are three options:

1) Connect the Tivo using the coax output of the cable box into the cable input of the Tivo

2) Exchange cable boxes with your cable provider for one with composite output jacks. It may require you to use a Motorola box that isn't High def depending on what your provider has. I know Comcast has a Motorola HD tuner that has composite outputs as well as component.

3) Upgrade to a Series 3 Tivo. Those units are designed for High Def. Use HDMI cable hookup.

If you are hooked up with a DVI cable you need to either use hdmi, component cables or turn off the non hd override...

Some CATV hi-def receivers are known to have issues keeping up with the datastream. Symptoms from the picture going solid black to other unpredictable video have been seen. Ask your CATV provider if they can switch your brand to another manufacturer. If your cable box has component video jacks in addition to HDMI, try that too. Some boxes will output RGB perfectly but bomb out with HDMI.

Component video has a max resolution of 720p. in order to use 1080i or p you have to use hdmi or dvi connections. That is why you get the flicker.

I have the EXACT same problem with my Sony SDM-P234 23" HD/computer monitor. I know it works (and it works great) with my DVico PCI card with my computer. It outputs in 480i, 480 p, 720p and 1080i with clarity on a simple indoor RCA HDTV antenna. I get the same quality (1080i) picture for the same three seconds as does lewy. I can also add that the digital coaxial output delivers 5.1 audio to my amp and it stays on even after the picture cuts out. Please help.....Comcast sendsa 'technician' out to service it and...well....did I say he's a 'technician'? He changed the box twice and says it must be my equipment. I guess its an act of God that it works with anything else.... I mean....its been checked out by a Comcast 'technician' after all.