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Author Topic: MPU problem  (Read 14787 times)
FORDSBS
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« on: June 12, 2013, 10:50:42 AM »
Working on Alphas. Have 4 MPU that give NO VIDEO INPUT. I put mpu from working machine in & they work-so problem is in mpu.
Power supplies good. Put new batteries in. Put bios & jurisdiction chips in from working mpu. Any suggestions what to look for?
Thanks Ford
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Neonkiss
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« Reply #1 on: June 12, 2013, 11:03:24 AM »
Sorry, never had one fail before.
Had bad power supplies and dead batteries for the CMOS, but they always booted up after a clear.

So you don't even get a screen image at boot up to show the boot sequence?   Scratch Head
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FORDSBS
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« Reply #2 on: June 12, 2013, 11:06:23 AM »
Put card in to clear & All that comes up is no video input
Also checked & no bend pins
« Last Edit: June 12, 2013, 11:33:46 AM by FORDSBS » Logged
FORDSBS
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PET
« Reply #3 on: June 12, 2013, 02:09:26 PM »
Any suggestions what to look for?
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Neonkiss
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« Reply #4 on: June 12, 2013, 06:00:47 PM »
When you swapped from bad MPU to good MPU did you use the same software?
Could it be a bad CF card.
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FORDSBS
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« Reply #5 on: June 12, 2013, 06:05:17 PM »
Never got into clear. The card I use works with other MPU with no problem. Tried another clear card with no difference.
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« Reply #6 on: June 12, 2013, 06:46:48 PM »
Nothing noticeable when you visually compared the bad MPU(s) with a known good for any signs of damage, failures, etc.??
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« Reply #7 on: June 12, 2013, 07:23:36 PM »
Did you make sure the BIOS chip is for the operating software ????? Won't boot if not correct. Move the BIOS chip and CF card operating system from a known good machine and see if the MPU starts to boot. The red light will flash.
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« Reply #8 on: June 12, 2013, 07:34:09 PM »
Ford,
When turn on the MPU switch Do you hear the short video chirp, similar to beep from a P/C when powered on. If not the video out is bad on the MPU.
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« Reply #9 on: June 12, 2013, 08:08:39 PM »
There are a number of different versions of Alpha MPU, if you use the wrong combination of BIOS and OS you will get nothing coming up

Harp
* MPU_Compatibility_Matrix_v18.pdf (89.97 KB - downloaded 382 times.)
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FORDSBS
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« Reply #10 on: June 12, 2013, 08:09:53 PM »
Quote from: CVslots on June 12, 2013, 06:46:48 PM
Nothing noticeable when you visually compared the bad MPU(s) with a known good for any signs of damage, failures, etc.??
Don't see any damage.

Quote from: idylewild1 on June 12, 2013, 07:23:36 PM
Did you make sure the BIOS chip is for the operating software ????? Won't boot if not correct. Move the BIOS chip and CF card operating system from a known good machine and see if the MPU starts to boot. The red light will flash.
It's correct

Quote from: lindam1 on June 12, 2013, 07:34:09 PM
Ford,
When turn on the MPU switch Do you hear the short video chirp, similar to beep from a P/C when powered on. If not the video out is bad on the MPU.

As Coors can tell you, I don't hear to good. I don't think it did. Tomorrow I'll have to check


THANKS ALL
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FORDSBS
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PET
« Reply #11 on: June 12, 2013, 08:13:37 PM »
Quote from: harp on June 12, 2013, 08:08:39 PM
There are a number of different versions of Alpha MPU, if you use the wrong combination of BIOS and OS you will get nothing coming up

Harp

I can not do first thing  -  clear it. So Os card is not in yet.
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harp
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« Reply #12 on: June 12, 2013, 08:21:15 PM »
On my first message there is an attachment, take a look and compare to what you have

Harp
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FORDSBS
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« Reply #13 on: June 12, 2013, 08:27:15 PM »
Thanks. I printed it out. When I get to shop tomorrow will have to look boards over. I'm sure this will help.
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harp
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« Reply #14 on: June 12, 2013, 08:32:49 PM »
Works well for me, let me know if it was of any use

Harp
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« Reply #15 on: June 12, 2013, 08:47:40 PM »
Quote from: harp on June 12, 2013, 08:08:39 PM
There are a number of different versions of Alpha MPU, if you use the wrong combination of BIOS and OS you will get nothing coming up

Harp

Harp, Thanks for that .pdf
I had a copy of it when I was setting up some machines on a boat in Port Everglades. I took a picture with my cell phone and it came out like crap. I've been piecing the info together and squinting at the numbers in that lousy picture for 6 months now.  bawling

K+ to you since I won't have to use my poor copy anymore.  applause applause applause
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harp
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« Reply #16 on: June 12, 2013, 08:52:21 PM »
Enjoy and thank you for the K
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lindam1
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« Reply #17 on: June 12, 2013, 09:19:06 PM »
Harp,
Very handy K+
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FORDSBS
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PET
« Reply #18 on: June 13, 2013, 02:58:52 PM »
Harp, very helpful.  +1 (Karma, or whatever)
Now, does anyone know what this chip is for?
Also where is the NVRAM battery 1?

* 100_2251.JPG (662.7 KB, 2048x1536 - viewed 197 times.)
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harp
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« Reply #19 on: June 13, 2013, 04:11:22 PM »
807 Bios Chip typically used with AVOS316, 317 etc

In front of the Bios Chip location on the MPU are 2 Batteries, the battery to the right is NVRAM Battery 1

Harp
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FORDSBS
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« Reply #20 on: June 13, 2013, 04:18:03 PM »
Thanks. The chip was lose in one of machines I got. I put it in for the heck of it. Booted up on screen like a computer. When it stopped I removed chip & put avbbp26s300m-03 like I have in other machines. could do clear & setup. But nvram battery1 low came up. I put 2 new batteries in & checked them, they are good.
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FORDSBS
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PET
« Reply #21 on: June 13, 2013, 04:25:36 PM »
3 of the mpu are 203684-1002 rev A. from what I got from info. you posted last night they are for dual screen. Would the be for one
with top & bottom screen? I pulled card out & they still would not work.


UPDATE--FOUND BATTERY PROBLEM. HOLDER BROKE ON BOARD

* 100_2252.JPG (860.32 KB, 2048x1536 - viewed 266 times.)
« Last Edit: June 13, 2013, 05:06:20 PM by FORDSBS » Logged
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« Reply #22 on: June 13, 2013, 05:52:21 PM »
 applause applause applause  Thats 1 down, just 3 to go! Good job!

And a  +1 (Karma, or whatever) to Harp for the info and help!
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FORDSBS
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« Reply #23 on: June 13, 2013, 06:00:31 PM »
Quote from: CVslots on June 13, 2013, 05:52:21 PM
applause applause applause  Thats 1 down, just 3 to go! Good job!

And a  +1 (Karma, or whatever) to Harp for the info and help!

Not my day. Now I'm back to step one. Damm thing will not work again. Sick of it for now. Tomorrow will pull out again & see if there are more bad solders. Cry Laughing Cry Laughing

Soon I'll just look for 2 GOOD MPU's
« Last Edit: June 13, 2013, 06:17:34 PM by FORDSBS » Logged
harp
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« Reply #24 on: June 13, 2013, 07:00:35 PM »
When you power the game back up and it does not Boot Up, switch the power off at the MPU not the main power switches

Then power the MPU up again, if it starts to Boot Up you have the wrong combination of Bios & OS installed in the game

Harp
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