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Windows 7: PSU went up in smoke. New PSU won't boot PC

11 Jul 2016   #51
westom

 
 

Quote   Quote: Originally Posted by townsbg View Post
With age the capacitors might go bad but why else might a motherboard scorch other than a bad power supply?
Another powered off a computer that was always on for months. It would not repower. That proved (using wild speculation) that power cycling is destructive. Then I took it. A pullup resistor had one function. To bootstrap the power supply controller during power on. Sometime over many months, that resistor failed. It was scorched. But I did not notice until test equipment found it faster.

That resistor failed due to a manufacturing defect - the most common reason for electronics failure. Power cycling only created a symptoms - it would not power on maybe one month after that resistor failed. A classic example of how wild speculation jumps to conclusions rather than first learn how electronics really work.

Most failures (even years later) are due to manufacturing defects. We all learned about electronics failing because some company counterfeited electrolyte. That manufacturing defect only became obvious in all electronics many years later. So many, instead, blamed fictional surges. And bought a UPS or surge protector. They could not first learn facts provided by the fewer who actually do this stuff.

OP's problem is addressed productively and immediately had he used recommendations that provide numbers. It required minutes of labor. Apparently fear and myths from others means that defect remains for days - when it could have been resolved in minutes.

Why would that part smoke? Only observed after the shop did shotguning - and did not use a meter. A burning smell only existed after it went to a shop - that also made bogus claims about short circuits. Just another reason why informed tech do not shotgun.

Had the meter been used, then reasons for the failure could also be discussed. Shotgunning means one must cast blame using wild speculation such as power cycling, surges, voltage variations, heat, ... maybe even an earthquake. Why not? Wild speculation can take liberties. Great nations are founded in liberty.


My System SpecsSystem Spec
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11 Jul 2016   #52
bigmck

Windows 7 Home Premium 32-Bit - Build 7600 SP1
 
 

Quote   Quote: Originally Posted by ignatzatsonic View Post
My kingdom for the "ignore" function.
My System SpecsSystem Spec
11 Jul 2016   #53
Layback Bear

Windows 7 Pro. 64/SP-1
 
 

I try to remember that this forum to the best of my knowledge is not a course in computer electronics.
Computer electronics at a basic level is very helpful to most in my opinion.
I would bet a dollar to a wheelbarrow that most members on the forum don't have a quality DVOM and most don't need one. If they had one they wouldn't know how to use it.

Exact numbers gathered by exact methods would be very helpful but not very practical for most to do.
Where one would come up with the schematics of all the hardware in any computer is be on my knowledge.
These schematics and diagram would be needed to do a complete computer electronic test. Even a company like Asus would not spend much time doing a complete diagnostics of such hardware. It's to costly.
I'm quite sure companies like Asus are not going to release such information such as the schematics on things like a motherboard.

Now to my point.
Yes people like me that try to help do speculate. We have no other method from behind our keyboards.
Our combined experience (been there, done that) and some knowledge of computers is the methods we have at hand.
Most members requesting help don't have a quality DVOM, oscilloscope, or a signal generator along with the schematics and training to do such test. As far as I know only the manufacture of such things as a motherboard have the ability to test such things and only their brand. Why would anybody spend a $1000.00 dollars testing a $150.00 motherboard.

One doesn't need a lot of training to know when they smell the death smell of hardware when the smoke is let out.

Now I'm going to speculate.
With the information we have to work with I'm as sure as I can be that the computer is junk.
If it does boot with a new power supply other hardware in the computer will start dying over a very short period of time. It will cost more piecemeal this computer part at a time than it's worth many times over.

I have had two computer that had power supplies the smoke got let out.
The first computer which I thought had a quality power supply was completely destroyed in a few days after installing a new power supply.
The second computer had/has a known quality power supply and the only damage other than the power supply was one SSD and harness. I think it was more of a harness problem between the two but I can't prove it.
I RMA the power supply and SSD and I haven't had any problems in many months. The second computer is the one in my specs. It cost to much (thousands) to throw it away with out trying to repair it. Because of the cost to benefit ratio I had to try. Their is a balance to most everything.
That is why I use Corsairs top of the line power supplies.

Concerning probuddha computer; yes I'm speculating but it's the only method I have sitting on the other side of the world behind my keyboard.

probuddha I hope the best for you and your computer.

Note:
The RMA for the Corsair power supply and Intel SSD went very well.
It took a few day before the smell got out of my computer, room and nose.
My System SpecsSystem Spec
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11 Jul 2016   #54
westom

 
 

Quote   Quote: Originally Posted by Layback Bear View Post
Most members requesting help don't have a quality DVOM, oscilloscope, or a signal generator along with the schematics and training to do such test.
A smelly PSU was replaced. Computer still did not work. How can that be when you know a burned smell from a PSU means it must be defective?

Who said anything about complex equipment? Read requested instructions or just invent fears. Spend $10 on a meter. Solution is that expensive. How much does a shop repairmen cost? $80? He could not even fix it. Why make assumptions about a DVOM, oscilloscope, or a signal generator? The emotional assume rather than first read simple instructions. Please learn what is required rather than deluge us with bogus speculation.

An eight grade education is sufficient to collect and post three digit numbers - in minutes.. Then the few, who actually know how hardware works, post a solution. Without mocking expressions such as "it might be... " or "maybe you could try ..." Amazing (actually scary) how difficult this is for some adults. To read and learn before knowing something.

What determines when a computer can power on and off? A power controller. What is the OP's problem? Power cycling does not work. What determines that? A power controller. A meter, some requested instructions, and minutes of labor answers. That means numbers. Eyes must glaze over so that a power controller does not burn out retinas. Lions, and tigers, and bears. Oh my. Cue the music.

Somehow a $10 or 600 rupee meter costs a thousand dollars? He feels. So it must be true. Entire problem can be answered in minutes. But that means a layman must read instructions that even an eight grade science student can perform. Of course, someone must provide the kid with a $10 meter and a screw driver - a complex task.
My System SpecsSystem Spec
11 Jul 2016   #55
probuddha

Win 7 Professional 64 bit
 
 

Got a new Cooler Master B500 V2.0 PSU and system is up and running again.

Thank you so much everyone for all your help
My System SpecsSystem Spec
12 Jul 2016   #56
Mellon Head

Win 7 Pro x64/Win 10 Pro x64 dual boot
 
 

Glad you got it running probuddha. Give it a few days of operation and let us know how it is running.
My System SpecsSystem Spec
12 Jul 2016   #57
probuddha

Win 7 Professional 64 bit
 
 

Quote   Quote: Originally Posted by Mellon Head View Post
Glad you got it running probuddha. Give it a few days of operation and let us know how it is running.
Surely. Thank you so much for all your help
My System SpecsSystem Spec
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 PSU went up in smoke. New PSU won't boot PC




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