Solved Seasonic heavy duty ATX power supply lost rhe power to LAN only

[loninappleton]

My best ATX power supplies are Seasonic but low power-- 400w example.

Today after a power on power off power on (not regular shutdowns just a
ower on - off at the wall I guess) the PS came back on and lit everyting up
but the ethernet didn't work. I tried a lot of things before switching out the
power supply: cables, install LAN drivers from the setup disk (that option was dark.)


I switched out a new unused Seasonic backup of the same type and the onboard LAN lit up
which I'm using now. How can one power line from the 24 pin plug just go
on power to the LAN chip? Could a fuse change (if possible , that I don't know)
fix a one line problem like that?

 

[loninappleton]

I have marked solved on this. I hooked the Seasonic up to my backup system and have
connectivity back. Will run it on that PC and see what happens and just store the PS that was on it.

It wasn't just thestatus light-- previously it would not permit a dialout on ethernet. Win7 reverted to the old
modem screen.


I don't know what caused the problem. Perhaps an ATX tester would help. I've seen those
but don't know a good one from a scam.

 

[file3456]

An abrupt power loss can break things. I've read my fair share of tech support forum threads all over the Internet on this to know it's true. You want to make sure you flip the PSU power switch to off before unplugging the PC right from the wall. And you most certainly don't want to pull the power of flip the power switch on the PSU while the computer is running unless pressing and holding the actual computer on/off button doesn't force the computer to turn off. It's an improper shut down, but if a computer is frozen it would be your only choice.

This is why it's important to have a backup power supply called a UPS (Uninterruptible Power Supply). That what if you lose mains power the computer will stay on for a few minutes allowing you to safely shut down without an abrupt loss of power that can destroy hardware and/or data loss. I personally use a CyberPower UPS that is meant for active PSUs. If your PSU is an active PSU, you need a UPS that supports that. CyberPower UPS Systems, Battery Backup, PDUs, USB Surge Protectors There's also CyberPowerPC, two completely different companies.

I don't own a PSU tester, but this one seems decent and checks out at Fakespot with a review grade of B meaning the reviews can be trusted. Amazon.com

Fakespot | Computer Pc Power Supply Tester Atx Itx Ide Hdd Sata Byi Fake Review and Counterfeit Analysis

If in doubt, call a reputable PC shop and ask what they use.

 

[loninappleton]

All good tips. No one does these things intentionally. It's difficult to catch yourself at it in the moment--
or as happened -- it was while I was sleeping and I heard the beeps of a PC coming back on and a house fan resume.



An electrian is on the way to look at the old wiring in this appt. The breaker box may need some new fuses.
It was an odd instance and half the place is still without lights or electric.

 

[file3456]

I wouldn't think fuses would be used anymore. May not be up to code.

Again, emphasis on a UPS.

 

[loninappleton]

My bad. Just a confusion of terms. I don't know enough about the insides of my apartment
breaker box. It has the usual flip switches. It was real odd. The event happened while I was

just waking up and hearing things restarting in the way a city power outage comes back on.
Not everything came back. Nothing of significance of power draw like space heaters (when it was

15 below zero here) had been on for days. Fortuanley it did not effect major appliances or the

central hot water and heat pipes. I should say some heat. Back in those cold days one has to have
supplemental.

 

[TechnoMage2016]

I have marked solved on this. I hooked the Seasonic up to my backup system and have connectivity back. Will run it on that PC and see what happens and just store the PS that was on it.
It wasn't just the status light-- previously it would not permit a dialout on ethernet. Win7 reverted to the old modem screen.
I don't know what caused the problem. Perhaps an ATX tester would help. I've seen those
but don't know a good one from a scam.

If you're going to be futzing around with PC Power supplies, having a PSU tester is a must.
As a PC tech, i have several of them...bought over several years. The newest one does more than the old one does. * But they aren't overly expensive, and it's truly a Great Tool.
One voltage that only certain PC's use is the Minus Five Volt line. And that voltage is usually the first one to go.

I have several PSU's laying around here, that work great, except for the -5v line.
I know I can use them on certain PC's or just for Bench Power Supplies.


*I actually have three PSU testers. The oldest one, is by "Coolmax".

The next one is a NO-Name unit.(Shown by Simpilot)

And the newest one is from "Rosewill". And, the newest one is also the best one, with the greatest Options.
I found the price very reasonable for a quality piece of test equipment.


Check it out, here...
Amazon.com


Good Luck,
TM

 

[loninappleton]

I put a used Rosewill on 'watch' at ebay.


The problem comes up so rarely.