Build Your Own Arcade Controls Forum

Main => Monitor/Video Forum => Topic started by: ncflagg on July 22, 2009, 12:07:35 am

Title: Electrohome roll
Post by: ncflagg on July 22, 2009, 12:07:35 am

I have a Mame cab with an ATI 2400 and soft-15khz. I can adjust the monitor just so but the screen always wants to roll. Controls/pots are very touchy. Tried 640x480 and lower resolutions. Does something on this Electrohome need repaired?

http://www.youtube.com/v/C3xzIDvG9pE

Title: Re: Electrohome roll
Post by: Kevin Mullins on July 22, 2009, 02:56:34 am

Quote from: ncflagg on July 22, 2009, 12:07:35 am

I can adjust the monitor just so but the screen always wants to roll. Controls/pots are very touchy.

I'm assuming you tried adjusting both the Vertical Hold AND the Vertical Linearity pots. (?)
How do you have your sync input connected?

Title: Re: Electrohome roll
Post by: ncflagg on July 22, 2009, 10:17:56 am

I think I just twisted the sync wires together.

Title: Re: Electrohome roll
Post by: Ken Layton on July 22, 2009, 10:52:03 am

Is the sync connected properly?

http://homearcade.org/BBBB/sync.html

Title: Re: Electrohome roll
Post by: ncflagg on July 23, 2009, 06:53:34 pm

You may be right there. I will try splitting up the sync. (and makie sure I'm not missing a pot somewhere)

Title: Re: Electrohome roll
Post by: DarkSide on July 24, 2009, 03:05:37 am

I'm not sure if this is usefull, but i had the same problems with a Kortek Chassis, when connected to the PC, the picture wouldn't stop rolling, and the controls was very touchy, the solution was connecting a 5kohm resistor between video ground and horizontal/vertical sync wires.

Title: Re: Electrohome roll
Post by: ncflagg on July 27, 2009, 08:49:57 pm

Splitting the H and V sync was the answer. Oddly, after getting the sync corrected the color was washed out. After a lot of elimination I finally discovered that TWO of the VGA connector pins had fallen out! Namely, the blue and green pins.

Now I remember why I quit working on this project several months ago....  :)

Thanks, all.

I'll try to remember the resistor trick for next time.