Build Your Own Arcade Controls Forum

Software Support => GroovyMAME => Topic started by: bandicoot on October 31, 2014, 03:58:41 pm

Title: (solved)No signal with hd4890 on CRT
Post by: bandicoot on October 31, 2014, 03:58:41 pm

Hello
I've got a problem with a hd 4890 saphirre vapor-x 2go when i connect it with a LCD in vga , dvi or HDMI i have picture but when i try to connect to my arcade monitor it doesn't work ( it's ok with a 4650 )
I try to flash it with ATOM but no luck
Does it mean i need a EDID dongle ?

Title: Re: No signal with hd4890 on CRT
Post by: Calamity on November 01, 2014, 09:42:47 am

The EDID dongle won't help, it is a monitor detection issue (i.e. load detection, not EDID detection). It should be possible to get it working by using the right output (usually DVI with DVI->VGA adapter). If that fails too, the only solution is to force detection with something similar to this:
http://forum.arcadecontrols.com/index.php/topic,141999.0.html (http://forum.arcadecontrols.com/index.php/topic,141999.0.html)

Title: Re: (solved)No signal with hd4890 on CRT
Post by: bandicoot on November 02, 2014, 02:11:35 pm

Thanks for your reply
Finally the probleme is out there
My vga-rgb cable ils faulty i connect H-V sync without resistor wich work fine with all card i test before but ni luck with this sapphire
With this schematic it s working
(http://images.arianchen.de/soft15khz/vga-scart-35mm.png)