Bad Video RAM on four-slot...

T

Tupin

n00b
Joined
Jan 5, 2010
Posts
18
Just got my first MVS, a nice NEO four slot. However, it boots up to this:

VIDEO RAM ERROR

ADDRESS WRITE READ
0000060F 55555 1555

What chips need to be replaced? How is it done?
 
Xian Xi

Xian Xi

JammaNationX,
15 Year Member
Joined
Dec 1, 2005
Posts
27,750
Check the traces from the video ram for any corrosion or cuts/gouges.
 
Xian Xi

Xian Xi

JammaNationX,
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Joined
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How did you test them?

You can try channelmaniac, but I don't know if he's taking new repairs right now.
 
T

Tupin

n00b
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Jan 5, 2010
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Checked it visually, and it looks fine.

Sadly, he isn't taking repairs at this time...
 
J

jew90

Geese's Thug
Joined
Nov 6, 2010
Posts
273
Tupin said:
Checked it visually, and it looks fine.

Sadly, he isn't taking repairs at this time...
Click to expand...

You need to use a multimeter the trace could be broken anywhere from the chip to its destination
 
channelmaniac

channelmaniac

Mr Neo Fix-it
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jew90 said:
You need to use a multimeter the trace could be broken anywhere from the chip to its destination
Click to expand...

It's a chip issue and not a trace issue. You can tell by the address the error occured at. Since it's not at the zero address for the block of memory then it's a chip issue.

If the error occurred at 00000000 then it could be either bad RAM or a bad trace... but since it occurred at 0000060F it can only be a bad chip.
 
T

Tupin

n00b
Joined
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Posts
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Thanks for the clarification...

I'll go to a local arcade repair shop to get it fixed, since channelmaniac is busy.
 
Xian Xi

Xian Xi

JammaNationX,
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Joined
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channelmaniac said:
It's a chip issue and not a trace issue. You can tell by the address the error occured at. Since it's not at the zero address for the block of memory then it's a chip issue.

If the error occurred at 00000000 then it could be either bad RAM or a bad trace... but since it occurred at 0000060F it can only be a bad chip.
Click to expand...

I need to learn this stuff. Where do I start?
 
Hewitson

Hewitson

Metal Slug Mechanic
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Mar 6, 2008
Posts
2,198
I certainly can, but with the shipping costs back & forth it'd probably be cheaper to buy another board.
 
Xian Xi

Xian Xi

JammaNationX,
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Joined
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A bunch of people in the US can do it, just wait for them to chime in.
 
DavidG

DavidG

REAL NAME: Jason Young, KNOWN SCAMMER, , This con-
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Nov 12, 2010
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I'm in the Toronto area and can do it as well.
 
channelmaniac

channelmaniac

Mr Neo Fix-it
15 Year Member
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Those are the wrong voltage.

This is what you need:

http://www.arcadecomponents.com/catalog/item/2251646/4758714.htm

They show out of stock but I have more in backstock. I have to go to the old house and pick up the shop PC after an after-hours conference call starting shortly. I use that PC to update the website inventory and will throw another 25 up on the inventory count later tonight.

RJ
 
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