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PSU dead.. possible further damage?

post #1 of 21
Thread Starter 
Hello everyone, so here is my story.

One day and while my PC was powered off, my PSU died (it was a Corsair TX850). It even caused the circuit breaker on my main electrical panel to shut down.
I had an old Corsair 400W, so i plugged that in and everything seemed to work fine, PC started normally with no issues.

But after a couple of days when i tried to power on my PC, i heard fans starting to spin, lights coming on, but after 1 second PC shut down. Although a little light the motherboard has still stays on after that, showing that PSU still delivers some kind of power. I tried to power it on again but nothing happened, the second time it didn't even power on for that 1 second. So i unplug the power cable of my PSU, wait a little, then plug it in again and then my PC started normally. When it starts normally nothing else happens, it works without any issues. This has happened to me a couple of times now. It doesn't happen every time i try to power on my PC.
Now there is something else that might have to do with that problem. My motherboard has a feature that allows you to charge your mobile phone while the PC is powered off via a USB, so i use that all the time. I think that every time this problem happens i have my mobile phone charging, but i didn't have any issues with my old PSU.

So my questions are these:

a) What exactly happens? This problem started happening after my PSU died and i switched to the backup one. This behavior points to what component having problems?

b) Is there a chance when my PSU died to have caused some kind of damage to my motherboard and cause it to sometimes have problems starting? I specifically bought an expensive PSU to have all those over current protections etc, and now i am wondering if those protections do anything if the PSU itself had damage, especially when it even caused the power on my room to shutdown..
Not to mention that the PSU died when the PC was powered off, it was just plugged in.

Also the status code on that little on board screen on the motherboard shows no problems. I also run Intel Processor Diagnostic Tool which showed no problems.

Really need some expert help here. I hope my motherboard or anything else hasn't been damaged by my dead PSU. frown.gif

My PC is this:

MB: Gigabyte Z77X-UD3H
CPU: i5 3570k
PSU that died: Corsair TX850
PSU i use now: Corsair 400W
RAM: Corsair Vengeance 8GB
Edited by zzalk - 3/7/14 at 7:59am
post #2 of 21
i had a ax 1200 and it killed a 480gtx , ssd (ocz vertex ) and a platter drive, the other 480 and ssds where not harmed.
Dyslexia
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Dyslexia
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post #3 of 21
What graphics card are you running? It is possible the spare 400w power supply is just not providing enough juice.
First thing i would do is get a power supply tester to test the 400W power supply, this can be bought for less than $20 on newegg i recommend the rosewill lcd one.. This in my mind is a good investment in any regard because it can be used in the future on other pcs to test the supply.
Second thing i would do is take out the discrete graphics card and use the onboard video for a bit just to see if it performs the same. If it does not power off without the graphics card in it and the power supply is good, i think it is safe to assume the power supply is just not providing enough power for the graphics card and the cpu.

Let me know what you find.
post #4 of 21
Thread Starter 
I don't have a discrete GPU, i use the integrated HD4000 on the CPU. And i don't really have many devices. One SATA HDD, a DVD drive and the 2 RAM modules, i also had a case fan connected which today i disconnected.

When PC starts i don't have any real problems. Yesterday i had work to do and was using the PC for 6 hours. I also did some 3D rendering which used the CPU 100% and didn't notice any issues.

I also just run a benchmarking tool to stress my CPU, and highest temperature was 57C on 1 core. Idle temperature 32C. Still no issues running that test (lasted around 2 minutes).

What is your opinion about the dead PSU, is there a chance those problems were caused by damage done to my motherboard?
Edited by zzalk - 3/7/14 at 8:40am
post #5 of 21
Thread Starter 
Here is a screenshot showing some readings on my PC in case it can help you.

post #6 of 21
Quote:
Originally Posted by zzalk View Post

I don't have a discrete GPU, i use the integrated HD4000 on the CPU. And i don't really have many devices. One SATA HDD, a DVD drive and the 2 RAM modules, i also had a case fan connected which today i disconnected.

When PC starts i don't have any real problems. Yesterday i had work to do and was using the PC for 6 hours. I also did some 3D rendering which used the CPU 100% and didn't notice any issues.

I also just run a benchmarking tool to stress my CPU, and highest temperature was 57C on 1 core. Idle temperature 32C. Still no issues running that test (lasted around 2 minutes).

What is your opinion about the dead PSU, is there a chance those problems were caused by damage done to my motherboard?

A power supply going out always has a chance to take out other components but most of the time they dont from my experience. I would proceed with getting the power supply tester, how long have you had the 400w corsair psu, and how do you know it is a good unit?
post #7 of 21
Thread Starter 
I have it for many years (around 4-5 years), but haven't used for a year because i had the new PC. I don't know if it is 100% ok.
It's just that after my new PSU died, i am worried that every problem was caused by that...
post #8 of 21
Quote:
Originally Posted by zzalk View Post

Here is a screenshot showing some readings on my PC in case it can help you.


Another thing i have thought of, do you have a battery backup unit? or are you plugging the pc directly into the wall? I can only assume it is being plugged into the wall.
Quote:
Originally Posted by zzalk View Post

I have it for many years (around 4-5 years), but haven't used for a year because i had the new PC. I don't know if it is 100% ok.
It's just that after my new PSU died, i am worried that every problem was caused by that...

Do you have any other power supplies you could test with for a while? perhaps borrowing from a friend? This is the cheapest thing to do without buying the tester, but if you can afford it i advise getting the power supply tester. I have one in my pc toolkit and it comes in handy more often than not on the job.
post #9 of 21
Thread Starter 
No, it is plugged directly into the wall.
I don't have any other PSU. Well i still have the warranty of the dead PSU so i will try replace it and see what happens.
Do note that before the PSU died i was hearing a weird whistling noise coming out of the PSU even when the PC was powered off, i brought it to my retail shop but they refused to replace it because they said they couldn't hear anything.....
post #10 of 21
Quote:
Originally Posted by zzalk View Post

No it is plugged directly into the wall.
I don't have any other PSU. Well i still have the warranty of the dead PSU so i will try replace it and see what happens.
Do note that before the PSU died i was hearing a weird whistling noise coming out of the PSU even when the PC was powered off, i brought it to my retail shop but they refused to replace it because they said they couldn't hear anything.....

That says to me the power supply was not up to the task from the get go. I dont like hearing strange noises coming from the psu, or any part for that matter. I think the problem is still pointing to the power supply if the computer functions normally for a while after unplugging it for a bit.
Another thing, a power supply that is 5 years old that has been sitting a while, i personally would not trust to run my machine.

is the problem just with the pc not wanting to power up occasionally? and that's when you have to unplug it?
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