Hacking an RS-170 tap into a B&W TV set?

From: Tony Duell <ard_at_p850ug1.demon.co.uk>
Date: Mon Mar 31 17:31:00 2003

> > You also need to get the sync signals in somehow. If you're lucky
> > (again!), you will find a point at the input of the video amplifier that
> > also feeds the sync separator -- which means you can feed in composite
> > video with no problems. After all, the signal at the output of the video
> > detector stage _is_ composite video, so the set must be capable of
> > displaying such a signal. The problem comes when this point only exists
> > within an IC.
>
> If it helps, the tuner is on a seperate board with a 4-wire cable to
> the main board. There are a couple of tunable elements (cap, coil),

The output of the tuner will be at the IF frequency (around 30MHz), and
it is not the signal you're looking for.

> a few caps, diodes and a single IC - CD2003GP

What's on the main board? How many chips, and are there any discrete
transistors? You really need to find the video detector stage -- the
output side of this is an almost perfect place to feed in composite video.

> This one is internal batteries or 12V car plug or a 12VDC wall wart.
>
> Of course, the internal voltages are still typical for CRT use, but
> no hot-chassis here.

OK, I think it's safe to assume this set doesn't have a live (hot) chassis.

-tony
Received on Mon Mar 31 2003 - 17:31:00 BST