Galaxian Problem

mcandrewsoun

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Ive got two problems with my galaxian board. Ive swapped some 74xx chips per the troubleshooting manual, but it hasnt helped.

Problem 1: On the attract screen, when the ships slide across along with the scores, the ships are way high on the screen, while the scores are in the correct location.

Problem 2: When the enemy ships dive, when the flip, they dont look right, also, they disappear about half way down the screen.. Im thinking it could be a ram problem..Due to the delicate nature of the board, I wanted ask for ideas before I desolder any of the ram chips..

Thanks for your help,
Andrew
 
More Info

The first problem, where the attacking ships disappear comes and goes, and I think is either a bad RAM or flakey solder joint. I can make it go away using a heat gun.. I havent been able to find the exact spot though...

The second problem ( where the attackers image gets messed up when it flips) I think is ROM related.. Does that sound feasible?

Now, a third problem has appeared.. Im hoping I didnt cause it lol... It seems like there is a second copy of the image shifted up maybe 1/8 -1/4 of the screen. Its like a ghost image, and only fixed objects..no missiles or divers. Could this be a ROM (or ROM Address) issue? the attract screen shows the same issues.

Thanks,
Andrew
 
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