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