ATI card will not sense older tv as sec. display unless VCR connected, help!
 

I have been trying to connect my older Zenith television to my ATI
video card
as a second display. The ATI card would sense that my Toshiba tv had
been connected with no difficulty and show it is as active . But with
the older Zenith tv, it will not sense my connecting it unless I run
the connection through the VCR. If I connect the video card RCA out
to the television aux in, the card will not sense the tv and activate
it as a second display device.

zenith tv with four video 'source' options listed in the menu:

antenna
cable
VCR
Y/C

the RCA jacks on the back of the television look like this:

VCR-1 Aux
video: O-------O
audio:
left O-------O
right O-------O
loop


Now that I have put the video card 'out' cables to the VCR's 'line in'
and then put an RCA cable from the VCR's 'line out' jacks to the
Zenith tv's 'VCR-1' RCA jacks, the ATI card in the computer at least
senses that the Zenith tv is connected, but there is still no desktop
displayed by the tv in the Y/C source display.

I have tried using double RCA plugs and splitting the 'line out' from
the VCR.
This is essentially a way of connecting two RCA cables to each 'line
out' (audio and video)
which then gives me two video cables out from the VCR and two audio
cables out from the VCR. I then connected two of the cables to the
VCR-1 jacks, and two of the cables to the AUX jacks. This did not work
either.

Please help with this. This Zenith tv was connected a few years ago to
my computer,
and it worked as a display, but I forget how I had it connected then.

btw, if this is any help:
The wall-cable for cable television is connected directly to the Zenith
tv. It is not being looped through the VCR (as I do not have enough
short cables to loop it)

Also, now that the ATI card senses the zenith, If I directly connect
the RCA 'lines out' from the video card to the 'aux' RCA jacks on the
back of the tv,
it still does not show my desktop display. The screen stays blank.

ATI card will not sense older tv as sec. display unless VCR connected, help!
 

On 16 Dec 2005 07:33:23 -0800, put
finger to keyboard and composed:

I have been trying to connect my older Zenith television to my ATI
video card
as a second display. The ATI card would sense that my Toshiba tv had
been connected with no difficulty and show it is as active . But with
the older Zenith tv, it will not sense my connecting it unless I run
the connection through the VCR. If I connect the video card RCA out
to the television aux in, the card will not sense the tv and activate
it as a second display device.

Maybe your card needs to sense a 75 ohm termination. You can test for
this by connecting a 75 ohm resistor across the card's RCA video
output pins. This should simulate the presence of a TV.

With your TV unplugged, what resistance do you measure at the TV's RCA
video inputs? What about your Toshiba TV? Is it possible that the
Zenith's AV inputs are AC coupled while the Toshiba's are DC
coupled??? What resistance do you measure at the VCR's AV inputs?

- Franc Zabkar
--
Please remove one 'i' from my address when replying by email.

ATI card will not sense older tv as sec. display unless VCR connected, help!
 

In article .com, wrote:
I have been trying to connect my older Zenith television to my ATI
video card
as a second display. The ATI card would sense that my Toshiba tv had
been connected with no difficulty and show it is as active . But with
the older Zenith tv, it will not sense my connecting it unless I run
the connection through the VCR. If I connect the video card RCA out
to the television aux in, the card will not sense the tv and activate
it as a second display device.

zenith tv with four video 'source' options listed in the menu:

antenna
cable
VCR
Y/C

the RCA jacks on the back of the television look like this:

VCR-1 Aux
video: O-------O
audio:
left O-------O
right O-------O
loop


Now that I have put the video card 'out' cables to the VCR's 'line in'
and then put an RCA cable from the VCR's 'line out' jacks to the
Zenith tv's 'VCR-1' RCA jacks, the ATI card in the computer at least
senses that the Zenith tv is connected, but there is still no desktop
displayed by the tv in the Y/C source display.

I have tried using double RCA plugs and splitting the 'line out' from
the VCR.
This is essentially a way of connecting two RCA cables to each 'line
out' (audio and video)
which then gives me two video cables out from the VCR and two audio
cables out from the VCR. I then connected two of the cables to the
VCR-1 jacks, and two of the cables to the AUX jacks. This did not work
either.

Please help with this. This Zenith tv was connected a few years ago to
my computer,
and it worked as a display, but I forget how I had it connected then.

btw, if this is any help:
The wall-cable for cable television is connected directly to the Zenith
tv. It is not being looped through the VCR (as I do not have enough
short cables to loop it)

Also, now that the ATI card senses the zenith, If I directly connect
the RCA 'lines out' from the video card to the 'aux' RCA jacks on the
back of the tv,
it still does not show my desktop display. The screen stays blank.

Does it do this with the tv turned on before turning on the computer?

If so, the ATI card could be requiring some sort of load on the wire to sense
that it is connected to a secondary display like a tv.