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Messages - Elgen

Pages: 1 ... 5 6 [7]
91
ARCADE / Re: Defective (original Irem) R-Type
« on: March 24, 2011, 12:08:42 PM »
Hmmm, well for visual, best I could, but I'll give it another round again };-D

92
ARCADE / Re: Defective (original Irem) R-Type
« on: March 24, 2011, 11:34:05 AM »
Well, I AM a total n00b to this, so where are the srams located on the board, and what kind of tests should I conduct?

93
ARCADE / Re: Defective (original Irem) R-Type
« on: March 24, 2011, 11:15:13 AM »
So you suspect it be a problem related to RAM also?

94
ARCADE / Re: Defective (original Irem) R-Type
« on: March 24, 2011, 09:01:40 AM »
I was kind'a hoping for Womble to make his entre in this thread };-P

95
ARCADE / Defective (original Irem) R-Type
« on: March 24, 2011, 08:04:42 AM »
Hi

I'm new here on the board.
My name is Elgen (aka Morten irl };-D), and I've been messing with arcade for about 5 years now.
I've done only very simple repairs like changing a capasitor or resistor, patching a broken circuit or IC-leg ect.
I have to say, that when I found this board, I was impressed; it's a gold mine of repair logs, truely inspiring };-P

Well now for the issue:
I have an R-Type (original Irem).
All the sprites display well, the controlls, gameplay, and sound is also good.
But the backgounds is all messed up. There are big rectangular patches of striped and solid goo, and there is white vetical stripes on the whole screen.
See video here: http://www.youtube.com/watch?v=If9BXlpWDz0
I'm suspecting this could be a RAM issue, but I don't know much of these things (yet?!).

Well bottom line, I've desided, that I want to give it a try at repairing it, but where do I start?
I've been through the standard things:
- Checking for physical damage.
- Taken the 3 boards apart cleaned all connectors putting it back together.
- Had all socketed IC up, cleaned legs and sockets and reinserted them.
Still the same. As said before I've never done REAL repairs of arcade, but I've got the tools (scope, multimeter, soldering iron etc.), I'm real handy, and I'm a fast learner when it comes to technical stuff (bordering autistic };-D).

Do any of you have any clue as to where I should start with this one?

I will ofcause post all progress here on the board };-D

Hope some of you will be willing to help a repair-n00b out.

PS. I've build my SuperGun/TestRig myself; you can see how that went by here (all comments in Danish, sorry): http://www.facebook.com/album.php?aid=110508&id=1390686556&l=d171261ea5

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