Taito Space Invaders PCB Issue

blowback

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I'm having issues with a Taito Trimline. I replaced the ROMs on the third board, as the chips were all badly corroded and missing legs. I'm now getting a solid pattern on the screen. Anyone know where I should start. I also tried to reseat the other chips on the other two boards, and get the same results.

Better pics can be seen on the flicker link below. Also added smaller versions on this thread.

http://www.flickr.com/photos/43426289@N02/sets/72157623775517837/
 

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