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When I use my TV (Sony KP-53HS30) with cable, DVD's, Roku, etc. it uses all 1080 lines. Set specs claim 1080i. But when I hook my new dedicated PC to it all I can find is 720.


Specifics are as follows: Graphics card is ATI HD4650 with HDMI out & VGA (15 dsub) outs. TV's has component in (it's pre-HDMI or DVI) so I hooked PC to TV using HDMI to component converter (popular one on Ebay, arched top, small no name box).


The ATI driver and Catalyst only allow one canned resolution that shows a picture on the TV that's not scrambled, that's 1920 x 1080 in interlaced 30Hz mode. I can then set a custom resolution 1440 x 1080. For 1080 lines in 4:3 that should be what I need. (I think).

At either of these settings the TV displays 720 lines (top and bottom of screen not used).


I don't get how the Roku or DVD inputs (component and S-video) display 1080 lines but the PC only 720. Is my converter a totally useless pc of junk that's causing my problems?
 

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I located a copy of your Owner's Manual but no answer to why only the 720p mode. Perhaps it is the converter box you're driving... although there is one reviewer who said he had to plug and unplug the unit...


Here's something to consider - this is an old CRT-based rear projection TV that can "do" hi-def resolutions like 720p and 1080i. Realize it's an analog system and you may not really be able to see any difference between these because the CRT has no 'native' resolution! It really depends on how many lines the raster is capable to draw and I don't get a sense of that from the manual.


Have you tried hooking up a commercially available progressive-scan DVD, Blu-Ray or Set-Top box to this Sony and seeing how it reacts? How clear is the picture? Now switch the output on your testing unit between 720p and 1080i output and see how much better/worse the display is. This should indicate the Sony's capability. Try this before you pull your hair out, and even then it sounds like you should be able to pass 1080i through the converter.
 

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Your sending a 16x9 signal to a 4x3 TV. Your TV accepts input resolutions of 1080i, 720p, 480p and 480i but 720p will be converted to 480p. It is working properly with a 1920x1080i signal over component. I bet your Roku and DVD player are set to output a 4x3 signal so they fill up your screen.
 

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Your component converter is most likey the problem, most of them are junk. Get a video card with a component dongle output, works MUCH better. The Nvidia 8000/9000 series commonly has these, not sure about ATI. Newer video cards have given up on component out since newer TV's have HDMI.


You TV's native resolution is 1080i, any signal coming in that's not 1080i is converted to this internally. The CRT's are scanned @ 1080i no matter what resolution you send to the set. 1920 x 1080 @ 30z is the same thing as 1080i. Your underscan problem could be a ATI control panel setting, it's set at -15% by default.
 
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