Hi,

I've got an official RGB cable for Master System 1/Mega Drive 1,
but, unfortunately it doesn't work .

It seems the composite sync is shot. I can only get a very faint composite image out if it and if I try the RGB mode it loses sync immediately.

However it seems to contain A LOT of components. Much more than you would expect from a RGB cable. A whole circuit board of them in fact. I don't understand how it works. Could anyone halp? I'd like to get the composite sync running again.

Here is what it looks like. It's in a box attached to the cable

The connectors on the left side are:

GND
VCC
+
G
R
B
Sinc
sound

Anyone have any idea what it does?