Stargate RAM Errors - Is RAM IC temp any indicator?

what ram is showing bad? or is it random? I can't suggest what to do next unless I have numbers.

It appears one of the RAM i bought is marginal. It boots with no issues, but the burn in test would thrown an error like this after a minute or two. The error would follow the bad RAM around the socket location when moved.

1000045507.jpg

With the second RAM I bought I was able to run the burn in for an hour or two with no problem. Later, I tried to run burn in again and it locks up on the second service screen with this colored pattern moving up the screen. Controls and service buttons inop and no error codes on the LED (0 displayed0) if I reset, it will boot and seems to work in attract mode, but locks up in service mode every time.


Need to go to work, but will likely try moving the new RAM to a different location to see if behavior changes in any way. Then move it back to the current location and see if the same behavior returns.

Might be unrelated, but the screen seems to jitter up and down periodically. I was going to post a video but it stopped and didnt have time to wait for it to come back. Im not sure if it is a sync issue with the monitor, or glitches in the signal. Tonight I'm going to put a scope on the video signal to see if there is any jitter in the sync signals.

Thanks for the help!
 
The settings screen lockup looks like a cmos ram problem. My machine did the same lockup, turned out to be a bad solder joint on a wire going to that little daughterboard that has something to do with the cmos ram. With that lockup I'm guessing if you start a game you get like a hundred lives, bombs and inviso but the game is hard as shit.

Is the monitor a k4600?
 
The settings screen lockup looks like a cmos ram problem. My machine did the same lockup, turned out to be a bad solder joint on a wire going to that little daughterboard that has something to do with the cmos ram. With that lockup I'm guessing if you start a game you get like a hundred lives, bombs and inviso but the game is hard as shit.

Is the monitor a k4600?
Wow, I think you might have nailed it! The game is like God Mode with difficulty turned up to 11. I'll take a look at what you describe when I get home tonight.

The monitor is a G07.
 
I was gonna say with the k4600 there's a high voltage cap on the G2 that isn't included with some cap kits that can internally arc causing a jumpy screen that I also ran into on my stargate.


That should be timestamped to where I saw the wire issue. Apparently those wires are a usual cause of problems.
 
I was gonna say with the k4600 there's a high voltage cap on the G2 that isn't included with some cap kits that can internally arc causing a jumpy screen that I also ran into on my stargate.


That should be timestamped to where I saw the wire issue. Apparently those wires are a usual cause of problems.
C621 yes https://www.arcaderepair.net/servicing-the-wells-gardner-k4600/

but alas they have a G07, so not this time. lol

if you have a Rev. - MPU with the IC1 add-on board in 6D it can freeze on the 2nd settings page if you've replaced the batteries. if it's booting to factory settings restored messages consistently and you know you have battery power reaching the 5514 CMOS then the CMOS chip itself may be bad. if either yellow or white wire breaks off to the IC1 6D board you'll get stuck on the open coin door message and won't be able to get into the game.

@Tr3vor42532 can you get a picture of your board in the area of the IC1 board? I'll put it on my site and let the world know you helped save everyone. lol I really need it to show where the yellow and white wires run. I have a couple of those Rev. - boards at home but they're kind of buried now.
 
The solder joint on the bottom looked suspect. I put new solder on these and the 2 connections to the board and problem seems to be solved. Not sure if it could have been related but the coin cell wasn't holding it snug so I bent the clips to tighten it up.

Thanks again for all the help!

Need to look at the monitor jitter more closely. It might only be there when powering up. I dont recall seeing it during gameplay.



1000045569.jpg
 
your white wire connection to IC1 looks like you soldered it for .00002 ms. add solder, don't just remelt the existing solder.
 
your white wire connection to IC1 looks like you soldered it for .00002 ms. add solder, don't just remelt the existing solder.
Give me some credit man! That was the pic before I soldered it. Lol. I removed the old solder and used new solder.
 
Give me some credit man! That was the pic before I soldered it. Lol. I removed the old solder and used new solder.
you are forgiven for this pre-worked atrocity LOL

can you get me a picture of the IC1 board and where the yellow and white wires connect? I'll make you not really famous.
 
you are forgiven for this pre-worked atrocity LOL

can you get me a picture of the IC1 board and where the yellow and white wires connect? I'll make you not really famous.


I have a little fame in some small circles, but if you could make me Billy Mitchell famous, you got a deal!

9wzu4o.jpg



Here is the full pre-rework pic.

Picture-1.png


What's the deal with this daughter board? Was is a major screw up in the design? Or was this added when they switched from AA to coin cell batteries?
 
I have a little fame in some small circles, but if you could make me Billy Mitchell famous, you got a deal!

View attachment 825771



Here is the full pre-rework pic.

View attachment 825773


What's the deal with this daughter board? Was is a major screw up in the design? Or was this added when they switched from AA to coin cell batteries?
they were always AAs, like they did on solid state pinball. I think it was a board printing error, none of the parts for that circuit are on the main board. lol

@braedel may have more wisdom on the topic. he needs more on-camera explanation videos.
 
they were always AAs, like they did on solid state pinball. I think it was a board printing error, none of the parts for that circuit are on the main board. lol

@braedel may have more wisdom on the topic. he needs more on-camera explanation videos.
Yeah, I see from the schematic.now that the IC on that board is just some TTL gates. Just seems weird that they could replace AA batteries with a coin cell without something else changing unless the AAs were way overkill. The AAs have at least 5x or more or more mA-hours than a 2032. Maybe it was a fair trade.. replace a coin cell every several months vs. batteries leaking all over the board.
 
I replace the batteries in my games yearly regardless of them being button batteries or AAs. better safe than sorry.
hilarious story, the games at my old-old job ran 5 years on AAs without issue. but I was regularly going in and out of them.

and then they all got sold. the end

Yeah, I see from the schematic.now that the IC on that board is just some TTL gates. Just seems weird that they could replace AA batteries with a coin cell without something else changing unless the AAs were way overkill. The AAs have at least 5x or more or more mA-hours than a 2032. Maybe it was a fair trade.. replace a coin cell every several months vs. batteries leaking all over the board.
lithium batteries was a mod that people started doing later, Williams never used them on pinball or the classic games
 
@Tr3vor42532 can you get a picture of your board in the area of the IC1 board? I'll put it on my site and let the world know you helped save everyone. lol I really need it to show where the yellow and white wires run. I have a couple of those Rev. - boards at home but they're kind of buried now.
20250612_025242.jpg

There's that if you want it, it's a bit easier to see the traces on that one.
 
Wouldn't you rather be famous for the post rework picture? I wanna see the fixed version … that'll get added to mecha's documentation.

Just started working on boards after a 25+ year hiatus. I'm confident in my soldering skills, but not proud. Need some practice before I put something out in front of the heartless critics in here.

"Clean your flux you filthy animal!
Hey Sir Whets-a-not, you call that a fillet?
Good God Man! How many rolls of solder am I looking at here???
Did you strip that insulation with your teeth? And it's little singed; Did you use an iron or an arc welder?"
 
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