Solved

Can a motherboard fry a power supply?

Posted on 2007-04-02
4
800 Views
Last Modified: 2013-12-11
I opened a Desktop computer because when I tried turn it on it was completely dead. No LED's or fans.
I tested the power supply and the tester only showed +5 volts was working.
I swapped the power supply with one that I know works and the motherboard fan and Power LED went on for a brief moment but still would not boot.
I checkec that power supply with the tester and again it only show +5 volts.
So I pulled out a third and very good power supply plugged it in and same results.
My new and very good CoolerMaster power supply ended up the same with only +5 volts working.
I am besides myself.
Can a motherboard fry a power supply?
0
Comment
Question by:ndallari
  • 2
4 Comments
 
LVL 39

Assisted Solution

by:PUNKY
PUNKY earned 50 total points
ID: 18840897
Any major short ciruit on motherboard will cause it. Make sure the motherboard is isolated with the chasis case by using stand-offs. Your case is not only PSU, also the motherboard have gone.
0
 
LVL 91

Accepted Solution

by:
nobus earned 75 total points
ID: 18841691
>>  Can a motherboard fry a power supply?   <<  yes, it can, as said.
But i think you may find out they are still OK, if you test them.
you can test them alone, and connect only a fan, or cd drive to it, then power on by shorting the  pins 14 to 15 :
http://www.duxcw.com/faq/ps/ps4.htm
http://www.fonerbooks.com/power.htm

you may have a bad mobo, and good power supplies

 
0
 

Author Comment

by:ndallari
ID: 18843315
The power supplies did start working again by themselves.
I guess they reset themselves after a while.
One of the power supplies did not return full functionality.
It is still missing channel -5 volts.
Is their any way to recover it?

I was also wondering if their is any use for all the dead power supplies I have hanging around. Can they refrubished by someone?
0
 
LVL 91

Expert Comment

by:nobus
ID: 18843613
>>  The power supplies did start working again by themselves.
I guess they reset themselves after a while.    <<   as i supposed; many power supplies have voltage and current protection, and if overloaded ( even by a short) go into protect mode, which takes some time to get out of it
>>  One of the power supplies did not return full functionality.
It is still missing channel -5 volts.   <<   that is a bad one; you can try to repair it yourself, but sending it to a Cy will cost more for repair than a new one.
0

Featured Post

Zoho SalesIQ

Hassle-free live chat software re-imagined for business growth. 2 users, always free.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

In this article you will get to know about pros and cons of storage drives HDD, SSD and SSHD.
In the modern office, employees tend to move around the workplace a lot more freely. Conferences, collaborative groups, flexible seating and working from home require a new level of mobility. Technology has not only changed the behavior and the expe…
This Micro Tutorial will give you a basic overview how to record your screen with Microsoft Expression Encoder. This program is still free and open for the public to download. This will be demonstrated using Microsoft Expression Encoder 4.
Both in life and business – not all partnerships are created equal. As the demand for cloud services increases, so do the number of self-proclaimed cloud partners. Asking the right questions up front in the partnership, will enable both parties …

920 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

17 Experts available now in Live!

Get 1:1 Help Now