Meridian Unplugged - Powered by MrTechGuy.co.uk Forums Discussion Meridian - Systems G91A Picture position

The G91 may be correct.

What you are watching is a 625 line DVD signal being upscaled not a native 1080p image. Overscan is the norm for 625 line images. 625 line has it's roots as an analogue signal for CRT monitors typically encoded as PAL and thus has no perfect mapping on to digital and even less when upscaled. Typically 625 line is mapped using the Rec 601 specification to 720x625 pixels (some broadcast framestore differ though) but this includes blank lines (13.5 each) top and bottom and time at the start and end of each line to allow for flyback and stabilisation of the electron beam on CRT displays. The reality is that you loose 27 lines giving a total or 576 verticle pizels and in pixel terms and approx 18 from the line giving approx 702 horizontal pixels although 704 pixels is typically used due to the ease of 704 pixels being a convenient multiple in binary.

To avoid seeing the contents of these non display areas, TVs would be set to overscan. If you dial this out and underscan a CRT you may see the datacast (teletext etc) at the top of the screen and the wiggle and flyback of the electron gun. However on a pixel based display such a LCD or plasma this residual is undesirable so even on a fixed pixel display these areas are either zoomed out with overscan or they are blanked.

I suspect what you are seeing are these areas being left blanked which is technically the correct way to handle these areas leaving the display overscan to hide the blank border if desired. Why it is not centralised I do not know. Other implementations may handle this area differently, such as zooming it out, possibly resulting in slight aspect ratio distortion.

Native 1080 material would be a different matter, hence reason why Sky HD and PS3 may not show this blanking.

Just my suggestion about why you are seeing what you are. I cannot be sure as when I owned my G98, my TV was (still is) a 1366x768 panel so the TV was either going to scale one way or another or in 1:1 mode, provide a border around the picture anyhow which masked the issue.