3.3V Problem Turned off the computer unexpectedly

3.136v is out of spec for 3.3V, that's not a good start.

Bobnova said:

3.136v is out of spec for 3.3V, that's not a good start.

Click to expand...

Sorry, I was wrong to put the data, which I indicated was: 3.316V not 3.136V.

I just made new tests with the multimeter and shaped me this:

+3.3V on Idle = 3.306V
+3.3V on full load = 3.313V

But at full load the system keeps shutting off, especially when I play or edit images or videos.

What's the 12v rail do under load?

Bobnova said:

What's the 12v rail do under load?

Click to expand...

How so? I do not understand well

Check the 12 V voltage at under and at load like you did on the 3.3v rail.
If it's good too, it probably isn't the PSU.

Bobnova said:

Check the 12 V voltage at under and at load like you did on the 3.3v rail.
If it's good too, it probably isn't the PSU.

Click to expand...

ahhh ok, perfect, making the test under load and idle the results are:
12V Idle = 12.02V
12V Full Load = 12.05V

Apparently the source is running fine. Furthermore it should be so as this practically new with about 3 months of use.
¿What else I can try?

Sounds like the PSU itself is happy. I would doublecheck all the connections to the motherboard.
I would also pull the CPU out and check for bent/burnt pins/pads and then put it back in.
If it continues and all the connections are good, I'd try to RMA the motherboard or at least try a known-good board if possible.

Bobnova said:

Sounds like the PSU itself is happy. I would doublecheck all the connections to the motherboard.
I would also pull the CPU out and check for bent/burnt pins/pads and then put it back in.
If it continues and all the connections are good, I'd try to RMA the motherboard or at least try a known-good board if possible.

Click to expand...

I thought if having premium NZXT sleeved extensions may be causing this? I have also installed LED light strips to light inside the PC. These accessories can cause this problem that I have?

It's certainly possible, one of the extensions could have a bad connector.

On another forum I read that disabling the BIOS C1E option would correct the problem and then try and so far has not turned off again.

You need to see this? that meets the C1E function?

System shuts down because Power supply surges detected during the previous power on.
ASUS Anti-Surge was triggered to protect system from unstable power supply unit!
then boots into BIOS to Reset. BIOS Version 2104

This is happening to a lot of people and I'm reading the same
very good fundamental suggestions for a cure in this and other forums.
However, So far I have not found a definative solution having tried
all the suggestions.
In my opinion, if a particular voltage spikes or drops at random but
is otherwise testing OK the situation gets hard to pin down.

One person described having the same condition as me. He replaced
the PSU but the problem persisted. That leaves the M Boad, right?
I guess depending on each persons exact system.
In another case, the PSU was replaced, and the problem was
solved, so he claims.

Components in my affected computer:

Case: Corsair Obsidian Series® 650D Mid Tower Case

Power Supply: Corsair HX750W 750-Watt Modular Power Supply

Operating System: Windows 8.1 Pro 64 bit OEM

Mother Board: Asus P8Z77-V PRO/THUNDERBOLT Socket 1155 Intel Z77 Chipset

Processor - Intel Core i7-3770K BX80667i73770K Processor

Cooler for CPU: Corsair CWCH60 Hydro Series H60 High Performance

Backup Power and Surge Protection: APC BR1500G UPS - Pro 1500

Memory: Corsair Dominator CMD16GX3M2A1600C9 16GB DDR3

Cooler - Memory: Corsair Airflow Fan For Up To 6 Modules

C:\ SSD Drive: Intel Solid-State Drive 520 Series - Solid state drive - 240 gb

Video Card: MSI Geforce GTX 550 N550GTX-Ti MD1GD5v2 Video Card

SHUT DOWN EVENTS (totally random and unexpected Latest to Earliest)
==================
07-25-14 at 6:00 PM
07-25-14 at 9:10 AM
07-23-14 at 11:25 PM
07-23 -14 at 2:00 PM
07-22-14 at 11:20 PM
07-22-14 at 4:10 PM
07-20-14 at 6:52 PM
07-20-14 at 4:00 PM
07-17-14 at 8:00 PM

Just a thought but I've been messing with an i7 3770t and lots of prototype psu, bench psu and pico units.
On the Asus G1 M3 sniper power failure wiped out both dual bios and bricked it.
Realising Asus were going through a junk board phase I just gave up and tossed it in the bin.

Got a gigabyte board... No problems at all ever thus far trying all sorts of crazy and running 24/7 for months on end.

So if you have had issues then think to reflash the bios as on Asus it seems easy to trash it with random power failure. As it may contribute to a cure.

Just putting the idea out there

Thanks BobbyBubblehead for your response.
Oddly enough, it has not shut down unrequested since 07-25-14 at 6:00 PM
In all honesty, I cannot conclude the Asus P8Z77-V PRO/THUNDERBOLT is the culprit.
The PSU, m. board & UPS are all prime suspects and in the same approx. price
range to replace. So far, all three have passed all tests except running the computer without the U.P.S. If it shuts down again using the UPS I will run without it. If it shuts down I can at least eliminate the UPS as the cause and report the info here at Overclockers.
Cheers,
Paul, aka Pkw