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

Hello, recently found John's youtube channel and watched most of your videos.  I'm hoping someone on this forum can assist me.  I have an Atari x/o football that I am restoring.  This machine has a b&w raster monitor.  I got a cap kit from Bob Roberts and installed everything and it worked pretty well for about a week.  Last night when I turn on the machine I get scrambled garbage on the screen.  Can anyone give me any guidance on what I might need to check?  Is this a monitor board issue or a pcb board issue?  Thanks for the help.

Follow up:  Monitor is a Wells Gardner 22v1001.  Also, I can hear the game playing but as I said can't see anything but garbage on the screen.  Same in test mode. Thanks

take a photo of the 'garbage' it could be a sync issue or a PCB issue.  I won't know for sure until I see it myself.

Updated info.  I was able to adjust the vertical hold and horizontal hold on the monitor board and the image came back.  The problem now is that the image is squished or elongated and does not fill up the entire screen from side to side.  I am attaching a pic.  It is a little hard to tell from the pic but you can see that the top of the screen is different from the bottom half.  I am attaching a pic in next post.

Also, I now get a message on the test screen that ROM A is bad.  Can you give me any guidance on how I can replace this rom chip?  Thanks.

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Ian, could not figure out how to put up a pic here so I emailed it to you.  THanks

Thank you Ian for the advice and private e-mails.  Wanted to let you know that the vertical pot we talked about was correct and my Wells Gardner 22v1001 screen is now filled up with the beautiful sight of Atari X's and O/s playing black and white football.  Game on.

P.S., test mode also now shows Rom A is good.  Weird.  Maybe I'll just reseat the chips.