622 overscan discussion

[4bama]

Like many other user comments scattered thru these threads I see a vertical overscan from the 622, like half the tickertape scroll at the bottom of the screen on both HD and SD channels with tickertape scrolls.

Most comments have been along the lines of "get your TV adjusted". However, I have tested many different TV's here, including standard definition TV's connected to the TV2 output and all are consistant with the same vertical overscan.

It appears that the 622 outputs are at least part of this problem, if not the major contributor.

It seems reasonable to ask DISH for a new feature in a future software release, add the ability to adjust the 622 output for overscan.

Maybe there's not a large percentage of users with this annoyance but thought I'd ask if it's worth making our list of future DISH software additions?

[patmurphey]

I have 2 622's and have no overscan issue with Sony LCDs. It's not an inherent output problem with the 622. Perhaps you should look a liitle more closely at your TV settings. (I'm assuming that you are not in the partial zoom aspect mode where vertical overscan is a feature.)

Pat

[Ron Barry]

Definitely not a common issue thought people have reported having it. Definitely make sure you are in normal mode (zoom wise) also you will see some clipping if you are using the enhanced guide in most cases. The fact that you are seeing this on multiple TVs makes me think perhaps you might have a bad box. Hard to say at this point.

As for the feature. It is one that would be nice to have to deal with this situations, but there are other features I would like to see first.

[Jim5506]

Check to see what mode your 622 is outputting (press the Cancel button and look at the lower left of the header) it should say normal. If it says strech or partial zoom or zoom, press the * key near the bottom left of the remote to toggle to normal.

If you have a fixed pixel display, there should be little or no overscan.

[Stewart Vernon]

If you are viewing on a CRT or CRT-projection TV, and you are seeing overscan... you will want to correct it by adjusting the TV anyway. Even if Dish offered such a thing for their receivers, it would have to be some kind of reduction in signal. Think of it like this...

XX|..........|XX
XX|..........|XX
XX|..........|XX

If the above is a sample TV where the "..." is viewable image and "XX" is cutoff due to overscan... The only way for the Dish receiver to adjust and get those "XX" in the viewable image on your TV would be reduction of resolution, or throwing away data.

But your TV can be re-aligned and re-adjusted to display smaller dots (remember we are talking CRTs here that do not have fixed pixel displays) and display finer dots within the viewable area and thus eliminate the overscan without losing image data.

It would be nice to have horizontal/vertical/centering adjustment on the Dish receiver... but overscan is really something that needs to be adjusted on the TV.

[paulcdavis]

On my Samsung 720p DLP set there is almost no over-scan. The HDNET test pattern shows left 2 right 2 top 2 and bottom 2. The "expand" setting on the Samsung has less over-scan than the "wide" setting. "Expand" passes 720p through without any scaling from the source and produces the best picture with the least over-scan. Check your TV settings as well as the 622 format mode to reduce overscan.

[Stewart Vernon]

Yeah, folks with DLP, LCD, Plasma really shouldn't be having any overscan problems. Technically those still have "overscan" in that they do not actually display the full 1920x1080 image BUT that is by design since broadcasters do not actually use all 1920x1080 in reality. Sometimes they don't go all the way to the left/right edges, but I don't ever think I've seen complete top-to-bottom.

So unless and until that changes, we probably don't want 0% overscan anyway since no useful picture data is out there...

But those of us with CRT (or CRT projection) typically have more overscan... I compared two similar models from the same company (about 2 years apart in design) and the newer CRT projection came pre-adjusted to have less overscan than mine did... so your mileage is going to vary and some folks will want to do more tweaking than others.