[Raion]

I might have a spare power supply stashed in my closet somewhere but please don't hold your breath. I will see if I can find it but I can't make any guarantees that it will work any better. I would sell it for a reasonable price since I'm not out to make a killing on this hobby.

Don't donate your machine to a recycler. we have a couple of people here from Minnesota and surrounding states who would gladly take it off your hands

[Irinikus]

Don't give up on it just yet, as Tezro's are generally very robust systems!

Are you absolutely sure that these things can't run on ATX power supplies, as I have seen it done in the past? (Even if it's just short term for testing purposes?)

It's the power supply, and your Tezro shouldn't be used with an ATX adapter - it is not compatible, or even straight through. You will hear people talking about it working, but that link points out that the Tezro's voltage demand goes up and down via a connector on the board. If you omit that, it's possible you're undervolting or overvolting components running on the rails. That's potentially going to shorten component life.

Do what I did and get a NOS PSU. It's not worth running it out of spec.

The series of VRM's found within the system are there for a reason! (So unless the Tezro's power supply varies its output voltage, this shouldn't be a problem?)

---

You might want to look at reseating all of the modules within the machine, including the node board as that's where the VRM's are located, as you mention that it was stored in a moist environment! (Corrosion may have set in!)

Take care when reseating the node, as the MEG-array connectors are particularly sensitive and absolutely must not be forced into position. (I've successfully done this more than once, as my tezro's node has been upgraded twice by me!) So it's not impossible if done carefully!

[Raion]

It does vary its output voltage, in response to load. I can't say I recommend it. Running our systems outside of design specifications is asking for trouble.

[vvestraa]

I promise not to.

DELTA DPS-550BB E / SGI P/N 060-0162-002 all the way.

if I can find one.

[Raion]

I'm looking through my stuff.

[weblacky]

Thank you so much for helpful replies.

I am currently in mourning for my Tezro, but it is kinda stupid.  A power supply with electrolytic capacitors from 17 years ago, stashed in a damp dark basement for years, well what did I expect.

I am happy to learn about the yellow SnapHat, and the DALLAS chips, but my big problem now, I suppose, is finding an old Tezro power supply at a reasonable price, and hoping that was the problem. 

That does seem the most likely problem because now when I attach the power cord, and the Windows XP computer running HYPERTERMINAL at 38400-N-1 using a null modem cable, a terrifying thing happens: 

L1 screams "INFO:  Cannot enable VRM: 9 / INFO:  Cannot enable VRM: 10 / INFO:  Cannot enable VRM: 11"  and then, for god's sake, the L1 REBOOTS , I hear the relay go "CLICK", and I can never even get an L1 prompt.

This is sad indeed.


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I am not a power-supply-designing electronics wizard like those EEVBLOG types, though I think it would be fantastic if you could somehow hotwire a modern CORSAIR TX750M to get the job done, even if it has to reside outside the Tezro case like an unsightly metal wart.

But that's just me dreaming.  Perhaps it has died, for real.

eBay has the power supply, from China, for $235.   Ian of SGIDEPOT has one at .... ...   at a very high price.   I am just a poor hobbyist, no way can I afford

I guess my best bet now is to scour eBay continuously for a cheaper SGI P/N 060-0162-002 Rev B

or donate the Tezro to a nearby computer recycler.

Which would be FREE GEEK TWIN CITIES.

=== ==== ====== =====

Or set up an auction on eBay where I make it clear to buyers, the power supply has gone bad and it might be DOA but then again it might not.

FYI, those three VRM messages (9 & 10 & 11) are NORMAL, both of my Tezros do it (a dual 800Mhz and a quad 700Mhz), it's not an error!  The L1 firmware is for the entire family architecture, some systems have differences, instead of customizing, they just put out one L1 firmware for all systems...differences do show.  It's a non-issue!  Nothing wrong with your VRMs, if there were, your health monitoring would have detected the voltage issues.

Also, don't just throw the Tezro away (you're working yourself up here), calm down.  Soon enough we'll be starting PSU rebuilding.  I'm about a few months away from starting SGI Indy PSU rebuilds, then I'm moving on to like Indigo2 and Octane.  Maybe it will be a year, but I have Octanes and Tezros that need PSU work, so I'm motivated.  I have a tezro that had it's PSU start going bad back in 2013...never had time for it.  So I'm in the same boat you are.  I also have a 1.8v voltage issue (along with two other users) on my Tezro mainboard that may be a cap issue.  So yeah, at least 4-5 of my stations aren't safe to run right now because they need PSU work.  Heck they ALL need PSU work.

It's going to happen sometime, just sit tight and save the pennies up.  Rebuilds won't be cheap, but they won't be that pricey either. 

But Raion is right, you have a PSU issue...stop running the Tezro until that is addressed (however it's addressed).  A faulty PSU can cause additional damage that isn't magically fixed with a new PSU.  You see the issue, just halt using it for now.  Keep on the forums and eBay, looking for parts and updates.  

Things are moving and happening, be patient.  SGI collecting is a long-term hobby.