Raspberry Pi Sanwa 29E31S

[corn]

Has any one managed to get a Raspberry Pi running on a Sanwa 29E31S?

I've got one of these hooked up to a Raspberry Pi2 (with an additional 5v feed to the adapter)
http://www.ebay.co.uk/itm/HDMI-to-VGA-3-5mm-Jack-Audio-Cable-Video-Converter-Adapter-Laptop-Xbox-DVD-PC-/131150082612?pt=LH_DefaultDomain_3&hash=item1e89277234

The adapter works fine on PC VGA screens (running at 640x480) but gives me garbage on the Sanwa.

I've tried all of the 640x480 settings in config.txt to no avail :-(

These are the (relevant) possible settings in config.txt - any ideas what should be the most suitable?

hdmi_mode=1    640x350    85 Hz
	hdmi_mode=2    640x400    85 Hz
	hdmi_mode=3    720x400    85 Hz
	hdmi_mode=4    640x480    60 Hz
	hdmi_mode=5    640x480    72 Hz
	hdmi_mode=6    640x480    75 Hz
	hdmi_mode=7    640x480    85 Hz

The manual for the Sanwa is here: http://www.arcade-museum.com/manuals-monitors/Sanwa%2029E31S_SERVICEMANUAL_Ver1.2.pdf

I've also ordered one of these to see if it is any better than my current adapter: http://www.raspberrypi-spy.co.uk/2015/01/introducing-the-gert-vga-666-adapter-for-raspberry-pi/

I know naff all about monitors so no doubt there is some kind of sync missing or something. Hoping one of you monitor Guru's have some suggestions as it would be great to get a Pi hooked up in my Naomi.

 

[obcd]

Isn't the Sanwa missing the edid eeprom. It's used by modern equipment to figure out what resolutions are supported by the monitor.

If you connect the pi setup to a pc monitor, don't you have a way to see on the screen OSD what resolution the video signal is?

Maybe you could connect the Sanwa to a normal pc and see if that gives you a normal picture.

Have you tried adjusting the horizontal frequency on the monitor. It might be slightly off.

Basically, 640x480 60Hz and 640x480 75Hz should work.

 

[corn]

Isn't the Sanwa missing the edid eeprom. It's used by modern equipment to figure out what resolutions are supported by the monitor.

If you connect the pi setup to a pc monitor, don't you have a way to see on the screen OSD what resolution the video signal is?

Maybe you could connect the Sanwa to a normal pc and see if that gives you a normal picture.

Have you tried adjusting the horizontal frequency on the monitor. It might be slightly off.

Basically, 640x480 60Hz and 640x480 75Hz should work.

Cheers for the suggestions - forgot to mention that I plugged a PC into the Monitor and it worked fine with no adjustments whatsoever (lubuntu).

I could mess with the horizontal frequency but the picture is so messed up I get the impression adjusting the frequency wont help :-( Of course, I could be totally wrong.

I'll take some pictures of the monitor to give some idea of what I'm seeing