I have no idea what happened to the SCART cable I used to have on my Acorn kit so seeing as my Cub is looking like it's going to die soon I thought it was time to make a new cable. Besides, soldering wires to the composite output every time I need to get a picture on the workbench cannot be good

I made up my cable in accordance to a picture from Mark @ Retroclinic which basically has 200 Ohm resistors on R, G, B, Sync and Blank (pin 16). I did not connect pin 8 because I don't like the TV auto-switching as wide-screen does my head in and I initially common'd up all the GNDs for the above signals and connected them to pin 17 on the SCART end and 0v on the beeb end. So far so good right? I even put the resistors into the round din plug and heat shrined it all nice.
Here's what it looks like on an old, cheap Goodmans "HD Ready" thing (lovely picture): Here's what it's like on the LG TV that I usually use (barely visible): Any ideas?
I've measured the 5V going to the blank signal and there is virtually no drop from one side of the resistor to the other. 5v in, 5v out to all intents and purposes. That's not what I was expecting and will mean the blank is above the spec of 3v, so I can understand the TV being unhappy. RGB signals seem to be the same - scope is saying an average VMax of around 4.4v. But why? The resistors appear to be fine.
On the blank I also tried a 470 Ohm value thinking maybe the TV doesn't have the usual (?) 75Ohm termination but it made no difference.
Finally, not sure if having all the grounds common was a good idea I went back to a single ground on pin 17 (SCART) as per Mark's diagram but again, no change.
I am 99% sure I used to use this LG before with this Master and it had a nice picture. I'm mostly trying to work out if there's anything I can do to make a cable that will work on both monitors, plus ensure I'm not driving the Goodmans in such a way that prolonged use will damage it. I've also remembered that I inherited what might be an ideal small LCD by Polaroid that is useless for PC as it has no remote but my be nice for SCART due to the small size.