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This 2012 K410 model of the Lenovo K Series desktop features a three speed power control switch and a 3rd generation Intel Core processor. Its high preformance graphics capabilities make it an excellent choice for gaming.

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Rebooting PC Lenovo E73

Hi all, I am having trouble with a rebooting PC its randomly restarts, I have tried all the usual suspects but have a specific qustion based on the PSU which I would like to know for future reference,

The Power supply is 180W for a Lenovo ThinkCentre E73 I suspect the PSU is at fault and have been doing some digging using AIDA64, Under voltages it gives these readings:

Voltage Values:

CPU Core 1.118 V

CPU VRM 0.368 V

CPU VID 1.118 V

+3.3 V 3.344 V

+5 V 5.618 V

-5 V -7.714 V

-12 V -14.914 V

+5 V Standby 5.188 V

My question is the 14.914V to high for the 12V board and would this be causing the random restarts, Any one who is able to interpret these results would be highly appreciated.

Thank You in Advance


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I’m pretty sure they picked that power supply on a very specific holiday with how bad of a choice it was :P. Even HP put it down for the p7 even though it’s almost as bad, but it’s a 260/300W unit lacking PCIe 12V. Dell was also smoking something with their 460W unit in some of the older XPS machines, but it has the PCIe 12V provisions on it at least. However, it’s probably only there because of the GPU options requiring it on some cards and it was too much to spin one without it. Even if it’s there, it’s not good for much - if you have the i7 3770 version of the XPS 8500 with this power supply and want a better GPU then the factory options, it needs to be replaced since there isn’t enough headroom left. It’s only good for a few low power cards that exceed the 75W PCIE slot limit or you need to replace it.

These low wattage supplies always burn out within a few years because they can’t take the stress they’re under for more then 2-3 years on average. That said, you may get lucky and run the original unit for 4-5 years, but that is rare. Usually these low wattage units use the 14-pin Lenovo supply that doesn’t comply to any ATX standard, especially since Ivy Brige or Haswell Celeron/i3 SKUs. It probably also weighs nothing, so I bet there’s an issue with the caps or stressed VRM modules due to the load. Repair isn’t worth it, sadly. Even if it was, these are stressed hard so you’d need to go over EVERYTHING and do a complete inspection.

Your machine uses the nonstandard Lenovo 14-pin - it’s a Celeron or i3 gutless wonder from the factory! :-(. From the limited research I have done, it looks like Lenovo took one of Dell’s dumb ideas from the early 2000’s with the PIII and early P4 s478 desktops with a standard 20-pin, but with a modified pinout. Even though it can be done with a SFF unit (PITA to find good ones 3rd party), this is to ensure Lenovo gets the sale and you’re locked into their crap units! Shame on you Lenovo for this decision!

It’s likely going to be an AcBell or an FSP Group unit (possibly a OEM Delta), so it’s not terrible but it is never going to be as good as a quality Seasonic retail unit. What makes this insulting is if this had a higher end CPU in it like the i7 with a full fat TDP rating (read: Not the S spec CPU), it would need to use the standard 24-pin connector to survive the load!

24-pin vs 14-pin (Standard)

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Lenovo “standard”

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Hi @nick ,

Just curious as to where the -5V is on the Lenovo power supply as mentioned by the OP but not shown on your Lenovo "standard" wiring diagram?

Presumably one of the "white" connectors.


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@jayeff Maybe - I don't have one of these sorry excuses of a power supply to find it. I'm thinking it's being generated from a VRM dedicated to the conversion in the nonstandard supply or it's being done with the +5V rail as a piggyback rail.

-5V is rarely used these days, but it's in the spec even up to 2.01 but is not present in the 2.2 revision, so Lenovo added it back. While it's there, the Lenovo connector doesn't follow any standards so anything goes. After the semi modern ATX machines, it practially became obsolete. It was primarily an AT thing.

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@nick I see. Custom connector. I thought only DELL did that a number of years ago!?!?

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@aactech They smoked whatever inspired Dell on the PIII and early s478 machines... They clearly wanted to go the extra mile to ensure that power supplies are nonstandard (despite being limited by the TFX spec anyway!) but all this stuff does is unite us on it being unacceptable. I looked at a thread on the Lenovo forum and people said they were going to Dell because of it.

For me those old Dell systems in question aren't worth messing with unless it's free or it comes with the newer system I don't want them anymore... Not just because of the power supply mess but because they're just not worth it anymore in a sea of cheap Core 2/Core i Sandy/Ivy machines and similarly aged AMD machines.

Supposedly adapters exist, but these are TFX units and you're pretty limited beyond 250W - I've seen 300W ones, but I don't know if they ever made 350W work on the TFX standard. Make sure the pinout is right unless you want to fry the board.

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Hi Gary,

Nice looking case.

The voltages will vary depending on load. Did you do the voltage readings under load?

180 Watts is ridiculously small! What was Lenovo thinking??? And custom connector!?!?@#%^&

Look just get a new motherboard, power supply 500Watts or better still higher and an SSD drive. Well it is a nice case.

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They were smoking something good while choosing the components. :P

Yeah... That's not happening unless someone makes a non motherboard killing adapter - see my answer on why. What a joke. Lenovo usually makes well regarded equipment but this kind of stupidity has been making it hard to go to them first. When I intentionally need to order a i5 or i7 system AND need to make sure I'm not getting the nonstandard supply, it's time to look elsewhere.

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Hi @ggwilson ,

There may be a problem with the PSU drifting outside the specified parameters when under load, as the Standby voltage (no load) seems within tolerance. Also it appears to affect the -ve voltage supplies more then the +ve voltage supplies.

If the -12V DC supply is reading -14V DC what is the +12V DC supply showing?

Usually the tolerance for a PSU is +/- 5% for the various voltages being supplied. Some of the other voltages that you have shown also don't seem to adhere to this e.g. the +/- 5V DC, especially the -5V DC as they both should only be 5.25V DC max. (although the +5V Standby voltage seems OK - no load?).

For the -12V DC supply only it is +/-10%, which would place it between -10.8V DC to -13.2V DC and not -14.2V DC as you apparently have.

Check what is written on the PSU itself to see what the specs are for it.

A PSU is a voltage regulator which means that it supplies a consistent, constant voltage output that should not vary outside the tolerances shown. What does vary is the current being supplied by the PSU, that is required to suit the demands of the PC at any given time.

I personally think that the -12V DC supply is too high and perhaps would be placing the components under a bit of stress by making them work too close to the top end of their max. voltage rating, e.g. some 12V components might only have a 16V max. voltage rating. At the lower voltages even 1V can make a difference sometimes.

Also use this PSU calculator to work out roughly what the PSU total output wattage should be for the desktop. The manufacturer may have installed the minimum that will work but does not really cater for any expansion that may be done.

You didn’t say but have you checked in Event Viewer to see if there are any noticeable Critical, Error or Warning events that show up or stand out about the times that the restarts occur?

If you have Win 10 installed, right click on the Windows Start button (left side of the Taskbar) and click on the Event Viewer link in the box that appears.

If there are any events that stand out, doubleclick on them to get more info and then search online using the Event ID number and the Source to find out more about what happened to cause the event

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