Tempest . It's freezing in here!

supercharged

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My Tempest will randomly lock up on attract. Always the same Web and the insert coin still flashes but that's it. When it is running I do get some random lines as well. change out the 118 chip and it didn't change. Self test comes up clean. I'm stumped
 

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Check the demo freeze DIPs. N13 block should be 1 on, 2 on, 7 off, 8 on. Guess it's possible that a component downstream from those could be the issue, but I'd start there.
The fact that the game isn't resetting and you have video means that the CPU and VG are working correctly.

I just had a similar issue with my Asteroids randomly flipping from English to Spanish (I believe). One of the DIPs that controlled the language was stuck half-on, and as the game warmed it up it would barely conduct in the wrong position.
 
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