Star Wars Trilogy, Graphics issue

brotherhay

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Sega Model 3 (step 2.1?), Graphics issue

Just picked up a semi-working Star Wars Trilogy that is coincidentally in a House of the Dead cabinet, nice!

Well, the problem I am having is a graphical issue. The game powers up no problem and the monitor works. I will get pictures or better yet a video if needed if my explanation of the issue is no good.

Turn the game on, screen shows the Lucas Arts stuff etc. I can coin it up, and start a game. But, when theres moving graphics on the screen all the graphics wash out. When things are static on screen, that looks fine. Once stuff starts moving around then everything gets blocky and you cant really see anything.

The graphics issue reminds me alot of when a video card heats up in a PC. You get artifacts and such, thats exactly what it looks like.

I can for sure get more info and do the graphics test stuff in the service menu. But as usual Im sitting here at work thinking about it but not being able to get to the machine and get working. So I ask in hopes that there may be a few things suggested to try once I get home and can dig in.

Hopefully this sounds familiar to someone, and some suggestions are made. Thanks in advance,
BroH
 
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Heres a vid of what I was seeing. I suppose is a bad spot in the game to show but really thats about all you get no matter where you make a vid.

The video portion is almost all artifacts.



I did the memory test, everything said good on screen.

I can get at the board stack easy enough. I was looking for a manual to see if any of the LEDs that are lit on board have a meaning. I can see a bunch, LED8 is out, the rest are on.
 
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I updated the title of this thread. It seems that so many games share this boardset so no reason to limit it to just SWT. Also, I would like some more info on the LEDs that light up on the board set. I cant find a manual describing which each means.

Ram/Rom tests show up fine, so its gotta be something on the CPU or Video boards. Someone has got to have some help for this problem.
 
It does look just like when Ramdacs die or overheat on a pc video card.

Well the thing wont fix itself so I guess Ill pull the board set and find that vid board and see what I can find.

I did find a guy that repairs sega boards like this, but would rather give it hell myself. If I fail, he can have at it.

Ill update my findings soon.
 
I've never even seen the boards for this machine, but as a PC guy I agree with the faulty video RAM assessment.
 
Ive talked with a Sega board repair guy and he concurs, its most likely something on the video board. Its a 3 board stack, CPU board, ROM board, and Video Board.
 
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