Nothing! No video or audio Space Invaders

LittleTimmy

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Hi all,
Could use some advice... I have a Midway Space Invaders that I recently revived, sort of. All was working except 2 sounds. I replaced just about every chip in the circuit(I have the original diagrams) Getting frustrated, I bought a used Daughter board, same number as mine, and tried it. I now have no picture or audio! I get about 1 sec of the screen when I shut it off only. The tube is lit. I tried another power supply that I had(All voltages are correct), cleaned both edge boards, I even tried my ROM test chip. Do you think the daughter board took something out of the main board? I don't know what else I can check. Fuses are good too.Maybe it's time to let the Space Invader Board Guru fix it, eh?? What do you think? Any help would be great. Thanks.
 
I wonder if its a monitor problem - have you tried connecting to a small tv to test?

Unplug the monitor - the video pins are black and white and in the corner of the plug. Connect those to an rca cable you can plug into the AV in on a test monitor or tv and see if you get a picture. Could be all the turning on/off put the monitor over the edge.
 
Thanks for the reply. I had another non working board, so I tried that one. I have picture, so I must have F'ed up something on the board. I guess I will send it in to Alex, unless anyone else has any ideas. Thanks.
 
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