Megadrive (japanese) ->XRGB-3, csync works, raw doesn't

[kamillebidan]

Dear all,
thank you for your great forum.
I have a japanese megadrive, and I bought an xrgb-3.
I connected them with a cable. Following the ping numbers of http://www.gamesx.com/avpinouts/genesisav.htm and http://junkerhq.net/xrgb/index.php/RGB21 the cable is as follows (MD=mega drive, X= XRGB-3)

M7-> 75ohm -> 100uF -> X15 (red)
M3-> 75ohm -> 100uF -> X19 (green)
M8-> 75ohm -> 100uF -> X20 (green)
M5-> 180ohm-> X16(+5v)
M4-> X21(ground)
M2-> X9 (sync)

The cable works,but I have the problem that XRGB  looses the sync (it jumps from 15Khz to 31 etc) with white flashes.
I then replaced the connection M2-> X9 (sync)
with the connection M1->X9

But when I do this, I get that XRGB finds the console (it does not say no input,as when I disconnect) but the screen is totally black. If I revert to M2-> X9 I still see the image.


Do I need to change something in the RGB21 as well?
Do I need to set something in the XRGB-3?

I read these threads, but I do not understand if the problem is related
http://nfggames.com/forum2/index.php?topic=3264.0
http://nfggames.com/forum2/index.php?topic=2097.0

Thank in advance