More Space Invaders resurrection questions

bones3010

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So for those of you that had chimed in on my previous SI post, thanks again for the pointers. Today I managed to get power running ad I'm seeing signs of life in this machine finally.

For review, this is a SI deluxe I'm helping a friend with. It was fairly gutted and only had a monitor and hacked up harness. I managed to trace the harness wires and found untested boards and power pcb's. After getting this all hooked up I powered up and got garbage on the screen and some random noises through the speaker which I considered encouraging. Now I know the power board seems to work as well as the monitor. I checked and adjusted voltages but no change. It doesn't play blind or respond to any buttons/coins. Since the CPU is untested I can only assume that it is the source of the problem. ...of note, after having it on for a few minutes I checked the ROM seating and they were HOT. I mean burning hot. What could this mean?

I'm wondering if there's any way to test the boards without another working SI? If not is there anyone on KLOV that test/repairs these? I'm getting out of my league once the problem goes to circuitry on a pcb. :-/

Here are some pics that may shed light (if they upload. I'm doing this from my phone ;-)
 

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Sorry... The pics only want to load real small. I'll try to upload larger shots if I get some time.
 
Try Eldorado Games - they sell repaired board and do board repairs for Taito and Midway.
 
Rebuild the power supply. Doesn't look like a reset circuit issue (anything in those lines that looks like parts of the aliens?), but if the cpu isn't executing any code id start at the power supply and work up from there.
 
If the roms are burning hot it would suggest one is socketed in backwards,i would verify they are working first(without them you will never have a game on the screen,That is the same screen i had before i replaced all the ram in my deluxe,here is a great resource on troubleshooting midway 8080 based games http://www.brentradio.com/images/SpaceInvaders/midway_8080_tech.txt
 
If the roms are burning hot..shut it off! Check to see that theyre in right (notch towards the edge of the board). Outside of that the roms may have been swapped from a different board and the board wasnt set up for them, especially if the board is set up for old 2708's...putting a 2716/9316 in there will toast them.

I fix these if your interested..pm me for details.
 
Thanks for the input, fellas... I'll scour Brent's site for some possible quick-fixes and post back.

Orion: Thanks for the offer to check these out if need be!
 
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