Asteroids Monitor Fix: Size Changes After Warming Up

[jasonbar]

Howdy-

First off, I apologize--I live in CA & my brother's Asteroids is in MI. I'm trying to help him troubleshoot it, but I don't have it in front of me, & electronics is not my brother's forte.

He says that, after about 30-40 minutes, the screen size will change--the image will shrink & then grow. Sounds as if something is heating up & going wonky. I suspect a bad solder joint.


I recommended the following troubleshooting procedures:

1 - Remove all connectors, clean, & re-attach.

2 - Pop all socketed chips, clean legs & sockets, & re-install.

3 - Reflow solder on all connector solder joints.

4 - Set up a mirror so he can see the monitor image from the back of the cabinet. Spray freeze spray on the monitor board in various places until the image fixes. Then address that region by reflowing solder.

5  - Set up a mirror so he can see the monitor image from the back of the cabinet. Push gently on various parts of the monitor board until the image changes. Then address that region by reflowing solder.



Any comments to add/remove?


He also bought a replacement PCB on eBay, but it arrived with a broken component that he's having trouble identifying. I can't seem to find the schematics showing the layout of the monitor PCB & listing its components.


Any/all help is much appreciated!


Thanks,
-Jason

[Gray_Area]

Klov folks will likely know this outright.

[jasonbar]

Indeed they do! I cross-posted there & already got some great replies!

Thanks,
-Jason