I'm checking this, before I go doing something stupid.
Source machine - NMS 8250 - Destination, SCART to HDMI converter.
https://en.wikipedia.org/wiki/NMS-8250 -
https://www.ebay.co.uk/itm/265028020602Signal should be RGB, but is very dim and distant only just about visible to the human eye.
Putting a multimeter across pin 16 to the outer shield (which I believe is electrical ground) gives 0.111V which is below the trigger threshold of 1 to 3V for RGB.
So I'm checking, before I go cutting into things and injecting voltages into lines and potentially blowing something up.
My brain is thinking... if the trigger voltage is below the 1v threshold, then fair enough. But if that's the case then why is the TV working fine? ... or is it because the TV is taking a component signal and not the RGB.... and the SCART to HDMI converter just can't handle the component signal?
Someone must have come across this before and there should be an easy solution. If not, then I'm thinking that the easiest solution might be to open up the Scart to HDMI converter and use its own power supply to connect straight to its own pin 16 internally to drive it high.
(it works off a 5v DC input, so it must be straightforward to cable it via a resistor - and disconnect the pin from the actual socket so I don't send power back down the wire into the MSX2)Grateful for wisdom and thoughts please, before I go blow something up.