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palcal
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Posted: 06 June 2018 at 8:15am | IP Logged Quote palcal

I don't remember walking under a ladder, tripping over a black cat and breaking the mirror I was holding but I had a bad day yesterday. My biggest problem at the moment is my computer power supply. We had 2 blackouts yesterday of about 4 hours each and now my computer is dead. Although it is a few years old it had not been used till I got it a few months ago. It is just dead, I pulled the power supply out expecting to find a fuse but nothing I could see. Luckily I got 2 of these machines at the time so swapped the hard drive over and am up and running again. But surely there would be a fuse. I know SMPS don't like being switched on and off quickly and for that reason thought there would be a fuse. The machine is an OCTEK and appears to be very well made.
Any one got any ideas.
Paul.

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TassyJim
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Posted: 06 June 2018 at 9:00am | IP Logged Quote TassyJim

Fuses are often internal to the power supply.

If the PC is a 'normal' size system, power supplies are reasonably cheap and it is cheaper to replace than repair.
Some of the small form factor PC's have less common power supplies so getting a replacement is not so easy.

And the fault could be somewhere else, not the power supply. Swapping the supply over could cause a replacement supply to go belly up too so life can get interesting.

Jim


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palcal
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Posted: 06 June 2018 at 9:40am | IP Logged Quote palcal

I opened the supply up but couldn't see anything on the PCB or elsewhere. It is not urgent the other machine is working OK.
Paul.

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Solar Mike
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Posted: 06 June 2018 at 10:02am | IP Logged Quote Solar Mike

Have a look at the mains socket where the power plug fits, often the fuse is in a flush pop out rectangular fitting next to the socket.
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palcal
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Posted: 06 June 2018 at 10:10am | IP Logged Quote palcal

I'm familiar with that type of fuse, there is nothing.
Paul.

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Grogster
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Posted: 06 June 2018 at 5:17pm | IP Logged Quote Grogster

I have recently had an issue with a PC PSU that was somewhat strange looking. I fixed it by just using a standard PSU on the outside of the case. Not very cute, but it does work fine.

Original PSU:



My way around this issue:



As I say - not attractive, but it works!

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palcal
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Posted: 06 June 2018 at 6:12pm | IP Logged Quote palcal

Should have saved the PSU from the computer I just threw out. I remember when it went in the bin, should I save the power supply?...No just more junk to store.
I will find one somewhere.
Paul.

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bigmik
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Posted: 06 June 2018 at 6:34pm | IP Logged Quote bigmik

Hi Paul,

Pc psu are pretty cheap providing it is a standard form factor..

If no noticeable damage check the high value bleed resistors near the main input caps.. typically 100ík ohm or higher.

Mik

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Bill7300
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Posted: 06 June 2018 at 6:48pm | IP Logged Quote Bill7300

Haven't had to look at a failed power supply in a computer for years, although I am reminded by this thread that I have one on the bench still awaiting attention. In earlier years of PC history, blown diodes were a regular occurrence and relatively easily checked with an ohm meter for normal diode function..
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Volhout
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Posted: 06 June 2018 at 9:56pm | IP Logged Quote Volhout

I am not much help here.
My advice would be buy a new one. They are dirt cheap.

On the other hand, generally power supplies are developed to sustain power ON and OFF switching. Typically they don't die.
I can imagine that in the power outage excessive grid voltages have reached you house, and the computer power supply (there is always a weak spot !) absorbed the energy and died.

Be aware that next time your TV, dishwasher or solar energy installation might die.
There may be value in beefing up the protection of your mains voltage.

And then, last but (maybe) not least....most houses get 2 phase or 3 phase from the grid. With a weak neutral, the voltage between phases varies with the load.
If you happen to have a large consumer (big airco) on one phase, and a weak neutral he unbalance can destroy electronics anytime. Not only during a grid outage.

These issues ae real. I encountered them myself in previous jobs. So be alert. If it happens again, you may have a clue where to look.

regards,

Volhout

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Warpspeed
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Posted: 07 June 2018 at 7:14am | IP Logged Quote Warpspeed

Your local rubbish tip may have big pile of deceased computers out the back somewhere.
Just eyballing a few of these might turn up something with a similar shape and size of power supply.
Chances are that for about five dollars you can rescue something, and there is a very good chance the power supply in it will work fine.

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palcal
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Posted: 07 June 2018 at 8:04pm | IP Logged Quote palcal

I have to go to the dump next week, they have a shed with such tings, I will have a look. Thanks
Paul.

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