M
Mike Warren
- Jan 1, 1970
- 0
We have just purchased a quantity of PCIe video cards with
TV out (S-Video) and can only get a monochrome picture
from the S-Video output.
I have so far tried 6 different cards from 2 batches and
all have the same fault. Here are my observations?:
-Another brand of video card that used the same video chip
(nVidia 8400GS) works fine using the same driver.
-The driver /is/ set up correctly.
- The fault is there in both PAL and NTSC modes. Only one
of my monitors supports NTSC so I haven't done any extensive
testing in that mode.
-These cards produce a B&W picture on 3 separate monitors
(2 LCD and one CRT) All monitors work fine with the other
brand. The 15 year old CRT monitor will produce a colour
picture from this card for a few seconds when cold.
- Feeding the signal into a Canopus ADVC-100 video capture
device produces a colour picture on my computer.
Here are some pictures of the output. In the oscilloscope
pictures the top trace is the composite signal after my
passive S-Video to composite converter (just a 1000pF cap)
and the bottom trace is the chroma signal from the card.
www.mike-warren.net/tmp/DSO1-ECS-web.jpg
www.mike-warren.net/tmp/DSO1-Leadtek-web.jpg
www.mike-warren.net/tmp/TV-ECS-web.jpg
www.mike-warren.net/tmp/TV-Leadtek-web.jpg
This is a vectorscope signal produced using Adobe Premier
from the same colour bar signal. I haven't recorded the
output of the good card since I don't believe the
vectorscope will help with this problem.
www.mike-warren.net/tmp/Vectorscope-Leadtek.jpg
What tests can I do to try and work out what is wrong with
the signal? I tried to read the frequency of the colour
burst but I haven't been able to lock the DSO (Tek TDS1002)
on it so far.
The supplier claims there is nothing wrong with their cards
as no one else has ever complained.
TV out (S-Video) and can only get a monochrome picture
from the S-Video output.
I have so far tried 6 different cards from 2 batches and
all have the same fault. Here are my observations?:
-Another brand of video card that used the same video chip
(nVidia 8400GS) works fine using the same driver.
-The driver /is/ set up correctly.
- The fault is there in both PAL and NTSC modes. Only one
of my monitors supports NTSC so I haven't done any extensive
testing in that mode.
-These cards produce a B&W picture on 3 separate monitors
(2 LCD and one CRT) All monitors work fine with the other
brand. The 15 year old CRT monitor will produce a colour
picture from this card for a few seconds when cold.
- Feeding the signal into a Canopus ADVC-100 video capture
device produces a colour picture on my computer.
Here are some pictures of the output. In the oscilloscope
pictures the top trace is the composite signal after my
passive S-Video to composite converter (just a 1000pF cap)
and the bottom trace is the chroma signal from the card.
www.mike-warren.net/tmp/DSO1-ECS-web.jpg
www.mike-warren.net/tmp/DSO1-Leadtek-web.jpg
www.mike-warren.net/tmp/TV-ECS-web.jpg
www.mike-warren.net/tmp/TV-Leadtek-web.jpg
This is a vectorscope signal produced using Adobe Premier
from the same colour bar signal. I haven't recorded the
output of the good card since I don't believe the
vectorscope will help with this problem.
www.mike-warren.net/tmp/Vectorscope-Leadtek.jpg
What tests can I do to try and work out what is wrong with
the signal? I tried to read the frequency of the colour
burst but I haven't been able to lock the DSO (Tek TDS1002)
on it so far.
The supplier claims there is nothing wrong with their cards
as no one else has ever complained.