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31  Hardware and U-Boot firmware / Hardware / Re: Another dead one? on: August 28, 2010, 07:27:14 PM
I'm beginning to conclude that although 240V/50Hz operation seems to expedite the breakdown process, it is only a matter of time before the SheevaPlug's PS bites the dust due to capacitor failure.  So, I'm seriously considering replacing all the electrolytics on the PS board on speculation.  I believe there are about 5 of them.

Does anyone have a complete listing of these components (capacity, voltage, temp, etc)?  I'd rather acquire the parts before I take the device out of service and open up the case to do the swap.  (I recently lost another 5V wallwart to a bad capacitor.  Was able to reincarnate it, but jeez, it seems like just about every electronic problem I have at the moment somehow revolves around bad electrolytics.)
32  Linux Stuff / Kernel / Re: Underclocking: cpufreq driver for sheeva/guruplug... possible? on: July 16, 2010, 02:35:35 PM
Not exactly what you're asking for, but have you looked at the following:


33  Hardware and U-Boot firmware / Hardware / Re: GuruPlug Server Plus Heat Problems on: July 15, 2010, 06:40:37 PM
Anyone else who can confirm that the GS suggestions do work and the device operates within normal temperature ranges?
This is hardly definitive, but here is one data point:  With one ethernet connected at 100Mb and Wi-Fi active, my idling GuruPlug Plus runs about as warm on its base load as my SheevaPlug does, which is to say it is comfortably warm to the touch, but not hot.

I really wonder, given what others have posted here, whether there is a reasonably significant variation among Plugs in this regard.

34  Linux Stuff / Kernel / Re: NFS on sheevaplug ubuntu on: April 03, 2010, 07:35:14 PM
Does the following help?

35  Hardware and U-Boot firmware / Hardware / Re: Poll: Sheeva Plug Power Supply failures - does the mains voltage matter? on: April 02, 2010, 02:59:12 PM
I'm not sure how polls work under SMF, but I think if I alter the Poll in any way, it will likely reset all the counts.

However, I was having a conversation about the Plug's "240V" power supply problem with a colleague over lunch just today, and he brought up an interesting point:  I had been presuming that the problem is related to voltage, but he pointed out that it could just as easily be a 50 Hz vs. 60 Hz phenomenon.  As most 240V mains are also 50 Hz, it might be difficult to determine which vector is causing the failures by simply polling.  In any event, the above poll seems to substantiate that something in the current design of the Plug's PS is overstressing a component to the point that it fails when used on a 240V and/or(?) 50 Hz supply, but is reliable on 120V 60 Hz.

Does anyone power their plug from a 240V 60 Hz source?  What about a 120V 50 Hz source?  If so, I'd be interested in hearing how long your plug has been running and whether or not you have experienced any failures.
36  Linux Stuff / Linux distributions / Re: Guruplug: Which distribution is/will be shipped? on: April 02, 2010, 11:54:31 AM
FWIW, I received an email from Globalscale yesterday which says, in part: 
This is an updated notice of your GuruPlug Server (Standard version, PLUS
version) order status.

Due to CE & FCC certifications process delay, we are expected to ship your
order at the end of April once the certifications are confirmed.
37  Linux Stuff / Linux distributions / Re: Cannot automount a custom volume from USB drive at boot time on: March 21, 2010, 01:25:10 PM
Rooster, while we are on this topic, I have a couple questions about rootdelay:

1.  I had thought the delay only applied to waiting for the root file system to become available, but I guess that is not the case, right?

2.  Does rootdelay=10 force a 10-second delay, or does it impose a delay of up to 10 seconds while waiting for a disk to become available?

38  Hardware and U-Boot firmware / Hardware / Re: Poll: What is the status of your SheevaPlug's Power Supply? on: March 18, 2010, 12:36:35 PM
Unfortunately, I'm not affiliated with either GlobalScale or the other company marketing the Plug in Europe.  I do, however, think it would be an excellent idea for them to offer replacement power supplies at a reasonable cost.

With all the brain power we have in this forum, you'd think someone should be able to take a look at their failed PS and publish a report of what needs to be replaced to bring it back to life -- maybe even specifying beefier components so that the problem will not recur.  Has anyone with a failed Plug actually looked into what fails on the PS board?  It appears one cap vents violently.  Does this take out other components, and if so which ones?  Perhaps this thing is repairable.
39  Hardware and U-Boot firmware / Hardware / Re: Poll: What is the status of your SheevaPlug's Power Supply? on: March 18, 2010, 12:20:56 PM
It's looking as if high-power USB devices are not a root cause of the power supply failures we have been experiencing with our Plugs recently.  It appears the voltage on the mains may be the culprit -- that perhaps the Plug's PS is not up to the task of handling a 240V line voltage:


If this is indeed the case, the good news is that I think there is a fairly easy work-around.  I would recommend that everyone running their Plugs in an area where a 240V +/- line voltage is the norm consider acquiring a 2:1 voltage step-down transformer for their Plug.  These devices can be ordered online and are relatively inexpensive, at least when compared to a broken Plug.  They are common among tourists visiting from parts of the world where 120V is the norm.

Good luck!
40  Hardware and U-Boot firmware / Hardware / Re: Poll: Sheeva Plug Power Supply failures - does the mains voltage matter? on: March 17, 2010, 07:19:37 PM
Maybe, but as Damon Runyon once observed:  "The race is not always to the swift, nor the battle to the strong, but that's the way to bet."

Actually, my best guess is that there are more 120V users out there.  How long has the Plug been marketed in Europe and Australia?  Complaints about failing PSs seem to have ballooned in the past few months.
41  Hardware and U-Boot firmware / Hardware / Re: Poll: Sheeva Plug Power Supply failures - does the mains voltage matter? on: March 16, 2010, 10:05:58 PM
Hmm.  Although I've left this poll open, and thus the results may be subject to change, it surely appears that the PS failures that have been plaguing some forum members recently seem to only be affecting those Plugs being powered from 240V mains.  Perhaps one or more of the PS components are not up to the task of handling the higher voltage.

I wonder in 240V locales whether it might be worth powering the Plug through one of those small-wattage 240V-to-120V step-down transformers that they sell here in the US for tourists venturing overseas?  These small transformers are fairly cheap and easily found by googling for them.  Might be cheap insurance.  Just a thought.
42  Hardware and U-Boot firmware / Hardware / Re: Poll: What is the status of your SheevaPlug's Power Supply? on: March 16, 2010, 08:22:46 AM
Rooster, I agree with you that this point could stand some clarification.  I also use a powered USB hub on my Plug with two 2.5" USB-powered drives connected to it, but I answered the question as if no power-hungry devices were connected to the Plug, because they are not drawing their power from the Plug's PS.

Everyone:  If you are using a powered hub with your Plug, there should be no significant power draw from the Plug's USB port even if you have high-power devices attached to the hub, so vote accordingly.
43  Hardware and U-Boot firmware / Hardware / Poll: Sheeva Plug Power Supply failures - does the mains voltage matter? on: March 15, 2010, 09:46:04 PM
More data gathering...
44  Hardware and U-Boot firmware / Hardware / Poll: What is the status of your SheevaPlug's Power Supply? on: March 15, 2010, 09:39:50 PM
Let's see if we can quantize the Sheeva-Plug's PS problems.  This is the first time I've created a Poll here, so let's see if I've done it right.
45  Hardware and U-Boot firmware / Hardware / Re: Fried Power Supply - Replacement Ideas? on: March 15, 2010, 09:11:17 PM
A couple thoughts:

+ Since it appears that our Sheeva Plugs are losing their power supplies at a prodigious rate, I wonder if there is something that can be done to resurrect them?  Has anyone had any success with replacing the caps and other components in order to bring the PS back to life after they have died?

+ For those of us who still have working supplies, is there something we can do to head off the problem?  I've been thinking of opening mine up to see if any of the caps are bulged, and replacing them if they indeed are.  Has anyone else done this?

+ Given that the PS at least seems to fail safe, such that the processor board is not zapped, I'd think it would be in GlobalScale's interest to sell replacement PS boards.  This would especially be desirable if they were to fix the underlying problem with the PS so that the replacement was solid.  (Or, an alternative:  Does anyone know of a PS board that could be substituted for what's in the Plug?)

+ Just curious:  of those who have had their Plug's PS go up in smoke, when did you acquire your Plug?  Is the phenomenon something that is occurring only with recently bought Plugs, Plugs that were part of the initial backorder, or is it endemic, across the board?

Let's try to quantize what is going on.
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