Thunder storm ( Power surge ) But PC survived

PulseDroid

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Aug 24, 2013
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Hi guys. Yesterday, there was a big thunderstorm, I was working on my PC when a bolt hit very close to my room, my PC went off and made a loud POP sound, there was a burnt smell too. It was not connected to a surge protector ( Stupid I know. )

I pulled out the cables and opened it up to see if there was any physical damage, but none I could see. The burnt smell was very prominent.

My Laptop ( and it's AC ) , my two monitors, and my amp, which was all in the same outlet survived.

When the storm passed, I plugged it in again, when I powered it on - The fans started rotating, yes the PSU fan too, everything sounded fine but the monitors weren't showing anything on the screen. I pulled out the bios battery for a bit, and tried again with no avail. ( BTW I've never had a bios peep ever, even before this )

I decided too claim from the insurance but they wanted a damage report. So it took it to our local PC shop, after an hour they called me and said they couldn't see any damage and they said it boots.

At this point I was very disgusted, but ok. I took it home and BAM it booted.

But, my CPU fan was spinning like mad - 5000RPM ( Usually it's about 2000 ) My CPU said it was 47 degrees, which is about 10 more than it usually runs at. ( I checked for dust, nothing. )

I ran Furmark to check for graphics problems, but it ran through. - I haven't run prime yet, think that would let the computer shut down if there is any problems?

So, what I am trying to get to, is how does the computer work but I heard a major POP sound ( 100% sure, my ear was sore for like an hour after. ) and the smell was so strong. Is it possible that my PSU is damaged but still powering on? Also is it possible to check whether these things could be faulty? I don't want to run a system that is about to break, also I don't want any more damaged components.

I am kinda sure it's the PSU, maybe the motherboard? . Anyway to check? Also how come the CPU is running so hot now.
( I know it's not too hot, but definitely a lot hotter, and 5000RPM, damn.

Is it even possible that something popped that loud and smelt that bad but nothing is broken?

Here is my spec ( nothing too major ) :

AMD Phenom II x2 545 @ 3.0GHz ( Never been overclocked )
ASUS M4A785TD-M Evo
GTX 550 TI 1.5GB
4GB ( 2x2 ) Kingston Hyper X blu
1TB 7200RPM Seagate Barracuda.



 

leo2kp

Distinguished
I would replace the PSU anyway to see if that helps you. Or what it could have been is a capacitor under CPU heatsink blew up and popped the heatsink off the CPU. Take the heatsink off and see if any capacitors are blown, but make sure to clean the heatsink and CPU and reapply thermal paste afterwards.

That just got me thinking, what if the PC shop already removed the heatsink and didn't reinstall it properly, or didn't apply thermal paste correctly? Also an option :)
 

PulseDroid

Honorable
Aug 24, 2013
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Just before you answered, I removed the heatsink. Reapplied but still didn't work :(

Didn't look for blown capacitors though.

EDIT: Just checked, everything looks okay in there. The smell is still there, less but still there. Can't figure out if I smell it at the PSU or the GPU, but it seems to be at the opposite side of the CPU.

Thanks for the tip though. :)
 
What is the brand and model of the power supply unit?

If the PSU has MOVs (Metal Oxide Varistors) on its AC transient filtering stage, most should, then the MOVs are suppose to sacrifice themselves during a power surge.

Some of OCZ's PSUs don't have a MOV.

Did the PC shop hook the PSU up to an oscilloscope to check the electrical ripple on the DC outputs? High ripple can cause higher temperatures especially for capacitors that will be overworked when they're trying to filter out that excess ripple. Eventually the high ripple will lead to damage of the capacitors on your motherboard, graphics card, disk drive controller logic, etc.

Borrow and try a different PSU to see if the results are better.
 

PulseDroid

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Aug 24, 2013
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I don' see any damage on the mobo, graphics or so. Didn't open up the PSU though.

Since most think it's the PSU, could this damage other components?

How do I prove to the insurance that the PC has a fualt. Don't want to just leave the case - with the possibility that it breaks in a month or so.
 

PulseDroid

Honorable
Aug 24, 2013
13
0
10,520
I don' see any damage on the mobo, graphics or so. Didn't open up the PSU though.

Since most think it's the PSU, could this damage other components?

How do I prove to the insurance that the PC has a fualt. Don't want to just leave the case - with the possibility that it breaks in a month or so.
 

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