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CPU keep resetting on startup

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Ron (r273):

« on: October 30, 2012, 08:50:13 PM »
I have a CPU in one of my Alphas that keep resetting as soon as you turn it on. It will do this continuously for some time and then boot up.
It acts like a bad capacitor that eventually comes to life as it warms up.
It's not a power supply problem, and is definitely an issue with the CPU.
Has anyone experienced this issue before?

Once the machine is up and running it's good. I have had it run 24 7 for two weeks with no problem.
Neokiss

« Reply #1 on: December 19, 2012, 01:02:40 PM »
Ok, we need to revive this one and find a fix...Neon never even got a response! With Alphas now hitting the secondary market, I'm sure this will help many in the future. 

We have 2 Alphas that are continually resetting on start up, much like Neon's issue, but......these never boot up!


Symptoms:

Monitor displays "VGA In", then "No Signal", then nothing...
Button deck flashes
LEDs in reel window flash
Little dashes flash in meter windows
Loud POP from speakers with each reset
The fan (or one of them) on the MPU spins intermittently

Neonkiss has done some testing and it does not appear to me a main power supply issue, and the next suspect is the power supply in the MPU.

Thanks in advance for your input Alpha Adonis'!

Roslyn

« Reply #2 on: December 19, 2012, 04:07:11 PM
It is the power supply on the alpha engine (mpu). It is an ATX 1U 525 WAtt server power supply. The caps go bad. You can try to recap it or just replace it.
There are a few different manufactures out there, one is IPC p/n H1M-6607P or P1H-5550V or H1M-5607v or H1M-5707v



Bally sticks anything down to a 300 watt in there, but I would not suggest lower than 400 watt min. That is why they go up so much..under rated.
coorlight115


« Reply #5 on: December 19, 2012, 04:30:57 PM »
   Once again coors comes to rescue. THE ALPHA GURU!!!
FORDSBS

idylewild1:
I have found when there is loud popping and the CPU restarting that the 24V power supply is bad. I have seen some that will finally boot up after some time passes. The power supplies have all been repaired by replacing two capacitors. Have the cap numbers at the shop if anyone needs them. Hope this helps.

DF777:
I have a similar problem and feel that is only a matter of time before the 24v power supply goes kaput.
It would be very helpful if you could supply the part #'s ,suppliers and location on the board of two offending capacitors.
I have 2 Alpha S9E's and have swapped the 24v power supplies and the loud popping that you mention has followed the bad power supply.
Although the PS's externally look identical there is a distinct difference as far as the layout of the internal components.
Thanks,DF777
 

idylewild1:
The caps I change are C412 and C42 10V 1000 ufd. They usually have a bulged top. Hope this helps.

Neonkiss:
For the record I did get this one fixed.
It was the caps on the power supply attached to the CPU.
Removed that power supply and found two bad caps. Easy to replace and the power supply boots right up as normal.
 
Sorry I never posted back the repair.  :duh:

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