[Openchrome-users] [openChrome] #33: Video corruption on via sp13000 (CN400)

[Ivor Hewitt]

Brent Shellenberg wrote:
> On Wednesday 19 April 2006 04:05, Robin Gilks wrote:
> 
>>> --- Using 720x480Noscale mode on an NTSC television through the SP13000's
>>> s-video connector, the top of the screen (10-15%) is corrupt in regards
>>> to
>>>  colour. The band of discolouration looks somewhat like a gradient. This
>>>  has been repeated on 3 different SP13000 boards using 3 different
>>>  televisions.
>> Is this by any chance in 24 bit mode? I'm using PAL and only 16 bit works
>> for me with NoScale
> 
> The problem occurs with both 24 and 16 bit colour modes.
> 
Basically it looks like your signal from the machine has slightly 
incorrect timings and either doesn't have the hsync burst long enough or 
there isn't enough gap between the hsync and the start of the image.

It would be interesting to know if the colours change if you move an 
image around on the screen in the area with the problem i.e. off to the 
left/right of the screen to see if/how that affects the image.

It needs someone with patience and an ntsc screen to tinker with the 
timings.

-- 
Ivor
http://www.ivor.it