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Author Topic: IGT G23 Upper monitor  (Read 4430 times)

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Offline Red_Devils

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Re: IGT G23 Upper monitor
« Reply #20 on: April 02, 2022, 02:25:25 PM »
I was getting +25v on the 3 red wires, but the fan on the side of the MPU is locked up, I tried to move the blades of the fan but they wouldn't move :(

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Re: IGT G23 Upper monitor
« Reply #21 on: April 02, 2022, 02:26:56 PM »
I was getting +25v on all 3 red wires, but I tried to turn the fan on the side but it's completely locked up I couldn't move it :(

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Re: IGT G23 Upper monitor
« Reply #22 on: April 02, 2022, 02:39:36 PM »
No airflow in these things is not good, it will definitely kill the mpu.  When you power up, you should hear a "beep" within a few seconds.  If you are not hearing that, then your mpu is most likely bad.  Since the rest of the machine powers up, you don't have a short (which is good).  Also keep your eye on the red LED that is next the white switch on the right hand side of the MPU (where the ribbon cable plugs in). After power up, the little light should blink once.  If it doesn't, it means there's no power to the mpu.  You may want to pull the mpu out, remove the top cover and have a look to make sure everything inside is plugged in.
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Re: IGT G23 Upper monitor
« Reply #23 on: April 02, 2022, 02:50:28 PM »
Rick, There's no beep and I've never seen the red light flash. It will try and pull it out to check the connections, but I fear the dropping of the machine by the shippers has more than likely damaged something. I need to get a hold of the seller to let him know that besides the outside damage the machine has more issues.  :'(

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Re: IGT G23 Upper monitor
« Reply #24 on: April 02, 2022, 02:54:17 PM »
+25VDC?  It should be +12VDC.  Something isn't right there.  Hopefully your meter, because if your power supply is putting out +25VDC on a +12VDC line you're going to have some problems for sure.  Check it again with a different meter if you have one.


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Re: IGT G23 Upper monitor
« Reply #25 on: April 02, 2022, 03:14:04 PM »
+25VDC?  It should be +12VDC.  Something isn't right there.  Hopefully your meter, because if your power supply is putting out +25VDC on a +12VDC line you're going to have some problems for sure.  Check it again with a different meter if you have one.

That's totally my bad, I'm always picking the wrong voltage on my MM  :ashamed:

I pulled the MPU and all connections are snug and tight, there is no power getting to the board, the small fan inside doesn't spin and I goofed on the large fan it is fine, it spins freely. I would suspect the power board in the MPU is bad, seeing as power is going in from the connector but nothing is reaching the board inside.

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Re: IGT G23 Upper monitor
« Reply #26 on: April 02, 2022, 03:54:42 PM »
That's OK, better that than having +25VDC on that line! 

It sounds like you may have a bad ATX power supply, but it may be something else on the MPU board too.  Sounds like you've checked for the obvious, so I agree, it's time to let the seller know you have other issues in addition to the physical damage.

BTW I was really surprised to see the top monitor appears to work, but there may be damage not visible until you have a full screen image on it.



 

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Re: IGT G23 Upper monitor
« Reply #27 on: April 02, 2022, 04:46:11 PM »
i would just like to thank you guys for all your help. I have written to the seller and I will update you all with any new information.

I was surprised also to see the screen saver moving around the top monitor and it doesn't seem to have any internal damage but, the are plenty of scratches and dings because of the broken glass. It definitely needs a new monitor along with probably a whole new top box assembly and now the MPU has issues. I think it's best if he can take it back and send me a new one. I knew I shouldn't have accepted the delivery when I heard the glass dropping when they delivered it, oh well we all make dumb mistakes, I was just excited to receive the game after a month of waiting for it :)

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Re: IGT G23 Upper monitor
« Reply #28 on: April 02, 2022, 05:16:06 PM »
Glad to help.  Yeah, it probably would have been best to refuse the shipment, but live and learn as they say.  Hopefully the seller will take care of it satisfactorily. 

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Re: IGT G23 Upper monitor
« Reply #29 on: April 08, 2022, 03:32:36 PM »
So I have an update. I contacted the seller and he said he'll send me a new machine and to keep this one for parts. So I'm a tinkerer and while I'm waiting I thought I would try and figure this out.
I bought a new AUX power board but it doesn't look the same as the old one I took out, it was $100 so I thought why not. Anyway after swapping the board nothing changed, still the MPU failed to power up. I once again checked the 12VDC on the red wires and it was good. But it's still now pushing 12VDC to the board, I checked all 24 connections on the connector and I'm getting a couple of +5VDC but on the rails there is supposed to be +12VDC iss only showing .39VDC. So I connected an external ATX power supply to the box and the big fan on the side fires up but the CPU fan turns a little then stops, hmmmmm not good I think, I did hook up all the connectors to the game and the little red light flashes on the far right PCI card and it looks like it's getting power. But as I suspected after a couple of mins of it being powered on I hear a beeep, beeep from the board and of course the CPU is getting overheated because the fan isn't running. My question is in your guys's opinion do you think this mainboard is faulty and if the CPU overheated could that cause the machine to not send +12VDC power to it? I'm really scratching my head here because ever though the machine was dropped I can't see that causing issues with the mainboard.
Even connecting the machine to an external ATX power supply I still never saw a signal come to the monitors

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Re: IGT G23 Upper monitor
« Reply #30 on: April 08, 2022, 04:44:37 PM »
That's really generous of your seller!  You'll have a bunch of good spare parts if you do have a problem with the other new one.

Which ATX board came out of your machine, the one on the left?  I have a brand new one you're welcome to and see if it helps with your problem.  The ATX power supply should have +5VDC, +12VDC, +3.3VDC, -12VDC, and a 5VDC standby.  It appears yours is missing some of them. 

I never paid any attention to the fan on the CPU so I took the top cover off and powered it up.  The CPU fan comes on for a second or two, then turns back off.  A couple of seconds later it comes back on again followed by a single beep, then the CPU starts the bootup process and displays' the Blue AVP screen on the upper and lower monitor.  The beeps are part of the power on self test.  How many beeps does yours make?


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Re: IGT G23 Upper monitor
« Reply #31 on: April 08, 2022, 05:09:04 PM »
The ATX power supply on the right is the one I took out of the machine. The one on the right is what I replaced it with.

Yeah, the CPU fan turns on for a second on power up but never comes back on again. it stays like that for about 2 minutes them makes a beep, pause beep, pause beep and doesn't stop, no signal to the monitors and the heat sink for the CPU is too hot to touch. Did you notice on the IGT PCI card that there are 4 green and 4 amber lights on it, is that how yours is? This is when it's powered by an external power supply.

The only places I've seen on the internet to replace the mainboard is you have to buy the whole brainbox and that costs $500 plus shipping and I don't know for sure if that's what the issue is  :banghead:

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Re: IGT G23 Upper monitor
« Reply #32 on: April 08, 2022, 05:10:58 PM »
"The one on the right is what I replaced it with."

Sorry the one on the left is the replacement

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Re: IGT G23 Upper monitor
« Reply #33 on: April 08, 2022, 05:56:57 PM »
That doesn't sound real good.  I wouldn't think the CPU should get that hot that fast.  My PCI card has the same lights lit as yours does.  Try reseating your RAM SIMMs if you haven't already, and pull the video card out and see if it will boot with it removed.  The video ports on the motherboard will be active when the plug in card is removed. 

Yes, some of the parts for these machines are pretty expensive.  Hopefully you can get this CPU working.


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Re: IGT G23 Upper monitor
« Reply #34 on: April 08, 2022, 06:02:33 PM »
You may want to considering getting an ATX power supply tester.  I got one like this.   It doesn't load test it, but measures all the output voltages so you can see at a glance if something is missing or over/undervoltage.

http://www.amazon.com/gp/product/B00Q8SUYHW/

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Re: IGT G23 Upper monitor
« Reply #35 on: April 08, 2022, 09:41:52 PM »
Tilt, I actually do have one of those testers not as fancy but it is showing me an issue I don't understand.
I can probe the 3 red wires and get 12VDC going in to the ATX but attaching the tester I'm only getting 5VDC which explains why the board isn't powering up. The issue is it does it on both the original board and the board I just bought. The exact same thing on both boards, what am I missing?

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Re: IGT G23 Upper monitor
« Reply #36 on: April 08, 2022, 10:08:04 PM »
It appears your tester isn't turning on the AVP power supply.  The only voltage it shows is the +5VDC Standby which is on all the time.

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Re: IGT G23 Upper monitor
« Reply #37 on: April 08, 2022, 10:24:15 PM »
Tilt, That's the issue, the tester just shows the voltage going through the 24 pin connector, the other end of the 24 pin is plugged in to the ATX power supply and like I've probed before the tester is confirming that the ATX power supply's only delivering 5v to the pins that go to the mainboard and yet there is 12v being sent to the board. if I plug in the external power supply (from an old computer) all the lights on the tester are on, if I plug it in to the main board the fan on the side turns on and the IGT PCI card gets power but the machine doesn't boot, I hear no beep like the BIOS is booting, it stays on for a couple of minutes until the CPU starts to overheat because the CPU fan isn't turning on, then it starts to continually beep. There's no DIP switches on the small ATX boards I can see that would stop the 12v power from going through to the 24 pin connector as far as I can see.

It looks like I have 2 main issues;
1. The small ATX board in the machine isn't delivering anything but 5v to the 24 pin connectors, I have tried 3 different boards and all do the same thing
2. Bypassing the small ATX board and using an old computer power supply powers the motherboard but fails to boot the machine and the CPU fan isn't starting to keep the CPU from overheating.

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Re: IGT G23 Upper monitor
« Reply #38 on: April 08, 2022, 10:58:32 PM »
Here's a pic showing 12VDC going in from the machine and nothing coming out at the 24 pins. It does the exact same thing on all 3 boards I have. :banghead:

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Re: IGT G23 Upper monitor
« Reply #39 on: April 09, 2022, 09:43:23 AM »
Your seller sounds like an honorable guy! Who was it?

 

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