whats wrong with this picture?

[modessitt]

Originally Posted by mikeatunion

Is there anything that can be harmed trying this?

No. It'll either make the picture look worse or better...

[modessitt]

Originally Posted by mikeatunion

What I did for power was spiced off a cord going in for the switcher and then pluged into the monitor straight from the cord. There is a earth ground. w to w , blk to blk, grn to grn...

I am thinking of just disconnecting and using the original a/c plug it came with and just separating it from the line with the switcher on it.... Do you think that will make any difference?

We're talking about a jumper between the monitor frame and an AC ground somewhere...

[mikeatunion]

Originally Posted by sarge77

I don't think you are having a sync problem. Just try removing your earth ground from the monitor power connection. See if the lines go away.

I tried disconnecting the EG and things got ugly... I started getting bright lines going across the screed. from top to bottom. lony way


I did notice something.. Looking at my jamma pinouts it appears that the there is only a verticle sync. So I just hooked up the vertical and no change.


I am getting 5.1 volts at the pcb with no ac riding.

When there is no signal the screen looks normal, but as soon as it gets a signal the diagonal lines appear...

I am about ready to take it to a professional...

[modessitt]

The wire from the JAMMA harness is composite sync, not vertical. it should be connected to the negative sync pins on the monitor.

Did you try pushing the button?

[mikeatunion]

I talked to a local monitor expert. After eliminating everything it was something simple.

I was trying to make it neat. I zip tied some things the sync wires together. I took them off. I also noticed a stay peice of soder which I removed and I giggled the wires between the harness and monitor.

So after trying everything above... It all boils down to moving a few wires.


Okay so now the sync issue or ground issue or WETFIW is solved, I am getting what I believe is magnetic interference from the PS causing the side of the screen to appear greenish. If I open the cocktail cab a little the problem goes away.

I have a old shroud ... do you think putting that on will cure the interference?

[mikeatunion]

The problem is at the connection on the chasis. I was able to keep a little tension on the wires when repositioning them and got a good picture.

It also brightened up alot when I got a good picture.

So did I do a crappy job splicing wires, is there a cold soder joint on the chasis? Can molex connectors be crap right from the box?

Now that this is narrowed down .. anyone have any experience with a problem like this.

[KenLayton]

Perhaps the female half of the connector in your video harness in the cabinet has bad crimps on the terminals? Or the terminals themselves have tarnished?

[mikeatunion]

Seems weird but I replaced the power supply on a hunch from a friend. I also jacked up the voltage to 5.3 Volts and I have had no problems.

Everything here was entirely new....(cheap chinese equipment) other than the cabinet.

I don't understand how switching one PS out for another could make a difference.. but it did.

I also dont understand why when I was pulling on the harness it made any difference...

So... I guess the key to this hobby is hit it with a sludge hammer?

Thanks to everyone that helped me solve this problem... Now ...

There is a slight humm coming from the speaker... I doubt I can fix it, but I know the speaker is 8 ohms (pacman factory) I also believe that the 48 in 1 board requires a 8 ohm speaker. So anyone have any experience with this. I will post it in the other repair section.