Galaxian - Horizontal Lines

lpeters82

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Platteville, Wisconsin
My recently purchased Galaxian has some Horizontal Lines that are always present during gameplay. They are not there on the test screens so I'm thinking it probably isn't a Monitor issue. Someone here suggested replacing the eproms at K1 and J1 and I did that, but they didn't go away. I have also reset all of the slotted roms. Any other ideas on how to make these go away?

There is a picture of it here...

http://www.facebook.com/photo.php?pid=5667755&l=975224ecbf&id=702218846

Thank you in advance.
 

Thank you for the link. A lot of other forums would just say "do a search", which I did, but didn't find that link. That does look like the same problem, but in that video the fix turned out being exactly what I did...replace the Character ROM. In my case that didn't work. I also don't have the knowledge or equipment needed to do the testing that they did in the video. Hopefully, I can gain some of the knowledge, but I still do not have access to the equipment.

Is there any other way of narrowing down what it could be without that equipment?

Did I miss something in the video? It was the Character ROM they replaced, correct?

Any other fixes that might work -or- someone near SW Wisconsin that might be able to help?

Again, thank you in advance.
 
Sorry, one more question. In the video he say's he was expecting the problem to be in the Data Path. Something about it being high. How could I test for this and eventually fix it, if it turns out to be the problem?
 
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