I once bought a 4-way Scart switcher box from Tandy (RadioShack) and
when I tried it out one of the colours was missing which gave me a
pink hue to the screen.
This only happened in 60Hz PAL or NTSC.
When I took it back I was advised that the circuitry was only designed
to accomodate PAL.
Do you have a switcher box inline with your TV and Amiga?
I know those little flat pins in the Scart sockets can push in, bend
or their solder come loose. Try testing Pin-1 with Pin-1 on the other
end with the speaker-bleep continuity test on a good LCD electrical
tester.
If RF and Composite are okay then the custom chips must be supplying
the RF modulator with the correct colours so either your 23-pin video
port is damaged/dirty or it's the cable.
Another story here, I once sent an X-Box back to Microsoft's repair
centre three times (adamant that it was not outputting colour via
RF/Composite). Turned out the battery backup in my TV had died and
wasn't remembering the colour/contrast settings, but of course RGB
cannot be modified.
Never mind, it cost Microsoft £60 worth of Securicor bills. I did my
bit for the Amiga community.
:-D :-D :-D :-D :-D ;-)