Re: TV-Out question A8N-VM CSM

In article <438b0461$0$17706$afc38c87@xxxxxxxxxxxxxxxxxxxx>, "lsho"
<lsho@xxxxxxxxx> wrote:

> Hi Paul,
>
>
> Are you able to tell me briefly how to make that resistor?
>
>
> thanks,
> Carrot
>

OK. The following device is connected to CVBSout and GND.
That is composite video, which would normally be connected
via an RCA connector.

Parts list - in an ideal world:

http://www.frontx.com/order_c.html

(1) CPX075-2 - this is a plastic holder, and is not the
same thing as a disk drive jumper. A disk drive
jumper is a short circuit and would be an overload.

http://www.frontx.com/cpx075_2_1.gif

(1) CPX076 - package of 10 female pins. You will need to
use 2 pins from this package of 10.
Brass colored end goes over the motherboard header,
tin colored end is where a resistor is crimped.

http://www.frontx.com/cpx076p1.gif

In Aus, I found this electronics business. I don't know what
their minimum order terms are.

http://au.farnell.com/jsp/home/homepage.jsp

A 75 ohm resistor, for example, like this one, is the last
part you need:

http://au.farnell.com/productimages/farnell/standard/42253825.jpg
http://au.farnell.com/jsp/endecaSearch/partDetail.jsp?SKU=770486&N=401

My problem is, I have a tough time finding the FrontX components,
in catalogs like the Farnell one. So, an alternative, is to
snip the connector, plus a bit of wire, from the end of a dead
computer case fan.

Snip the excess lead length off the resistor. You will only
need two adjacent pins in a three pin fan connector, so the
third wire, if one is present, can be cropped real short.

Strip the plastic insulation off of two adjacent wires.
(Wires separated by 0.1" distance.) If you expose about 1"
of bare wire, it should wrap pretty easily to one end of
the resistor. Snip the excess lead length off the ends of the
resistor, leaving only enough tinned lead on there, to hold
the wire you are wrapping on it. Affix electrical tape (black
vinyl) over the wires, so there is no danger of your
"project" touching anything on the motherboard. This is the
circuit you are building:

75 ohm
+------/\/\/\-------+
| resistor | <--- keep slack wire length short,
| | like 1" or less of slack wire
+------+ +---------+ on each side. Use tape to
| | cover the bare wire to
| | + avoid shorting.
| | |
--------- 3 pin female fan
| | connector, from an
|X X X | old motherboard fan.
---------- Cut off the third wire, if present.
\
^ ^ \____ the empty one doesn't connect
| | to anything.
| GND
|
CVBSout

If the small plastic index ribs on the fan header get in your
way, use a small file to grind them off. Do not attempt to
remove the unused third pin on the end of the housing, as you
may destroy the strength of the rest of the plastic.

For a home builder, the easiest way to strip the plastic off
the ends of the fan wires, is to use a razor blade. Place the
razor blade over the wire, and rotate the wire on your table,
while applying the razor blade. It takes a deft touch, to sever
the plastic, and not damage the wire inside. Take the wire in
hand, and pull on the plastic insulation, and it should slide
off, exposing the wire.

The result, should be a 75 ohm resistor, connected from CVBSout
to GND. A GPU, such as the Nvidia one on your motherboard, should
be able to detect the 75 ohm load, and it will assume the load is
caused by the baseband video input on a TV set.

As I said before, I cannot guarantee this will work, because
the actual issue could be a software or a BIOS one. The Nvidia
web site claims the chip supports multiple monitors, so in the
fullness of time, with BIOS and driver updates, it should
start to work.

If this test succeeds, and yet it doesn't work with the Asus
adapter you bought, the adapter pinout may not be correct for
this motherboard. That is a very remote possibility, as the
pinout is so simple, they could hardly screw it up.

HTH,
Paul
.

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