super pac pcb not booting up

RedlandMan

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this is my spare pcb im trying to get working. The problem is narrowed down to the cpu board as the video board works fine with another cpu board. Everything that is removable has been tested on another board. My working board will boot up to the self check screen if the sound cpu is removed so im assuming my problem is with the main cpu at 1A. Im a noob at this so any help at least pointing me in the right direction would be great.
 

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Finally after a couple of headaches i got this working. I found a broken trace from rom 1C pin 19 main data bus to LS245 pin 18. When you guys say you need a microscope to find broken traces you werent kidding. This was so small i would have never noticed it. The only reason i found it was narrowing areas down with the multimeter.
 
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