John's Arcade Forum - Classic Arcade and Pinball Collecting and Restoring Discussion Forum - RETRO MAME - Nintendo Vs Forum

Here's what I've got so far:

http://imgur.com/pASZqnK

The PCB is a Street Fighter II, and the monitor "out" on the JAMMA harness has 5 wires - red green blue, and a ground and a negative composite sync wire.

The monitor is a Neotec NT 2501 with one 6 pin spot to plug the video into - red green blue, ground, then separate vertical and horizontal sync pins.

http://imgur.com/VbAmDYE

I've temporarily connected the negative composite sync to both the horizontal and vertical spots via a 3 conductor Wago lever nut. (Which could totally be the wrong way to do it.  :-[ )

http://imgur.com/KHgbPqI

Now, if I connect the negative composite sync cable to either only the horizontal or only the vertical sync, it gives me a thin colorful line across the monitor. Tweaking the knobs on the above pictured adjustment board either does nothing, or gives me a colorful mess across the whole screen.

Since this is a newer monitor (1998), my assumption is the input on the monitor accepts both negative and positive sync wires without trouble, but I've yet to find info on that. I've looked for a separate spot to plug negative sync wires, as they're usually 3 pin spots, but no luck.

My question is, there's brown stuff all over some of the capacitors:

http://imgur.com/SeEcCu5
http://imgur.com/1PbiamI

Is it possible I need to buy a soldering iron, some junk boards to practice on, and email therealbobroberts for a cap kit to get this fixed?

i think you should probably get that board cleaned up and do or have someone do a cap kit. There is a lot of what looks like left over flux corrosion. There is something going on with the hsync for sure there. Usually a double image is caused by a doubling of the input signal compared to the hsync clock on the monitor. basically, stick a 31k signal into a 15k monitor and you will get something similar to what you are seeing. I dont have any first hand experience with that particular monitor but there is something worth looking at surrounding the hsync.

Awesome, thanks so much! I'll have to double check that I'm connecting the motherboard to the monitor correctly, and then work on getting the monitor motherboard out of there, so I can start cleaning it up and replacing parts!