Sorry to threadjack, but I'm having a similar issue and was kinda wondering the same thing. Here's what I've got:
A 6" LCD off of one of those "Car DVD in a bag" units.
A Compaq Celeron 2.4 ghz laptop (with no screen) with an S-video tv out
Now the video connection from the LCD is a headphone type/looking plug. I had some adapters to convert that to an RCA female connection.
On the laptop side I have an S-video to RCA adapter. This allows me to connect the LCD and the laptop.
I do get video, but it's crap to say the least. The resolution on the laptop is set all of the way down to 800 x 600 and it's also set to the lowest possible "Colors" setting.
The picture still looks blurry and the colors don't seem right.
Any suggestions?
Can the laptop resolution be taken down any lower?