If a just built PC goes bang on power-up...

J

JAD

I've also seen PSUs with the selector switch, but upon inspection it is
determined that the selector switch isn't wired up to anything inside of the
unit. Probably cheaper to throw them in all units but only wire up the ones
heading to non-US areas.

Jon

That's one of the craziest things I've heard in awhile. Imagine the
frustration and danger if those PSUs would ever to venture out of the
local.
 
W

w_tom

Experience without basic theory makes one his own worst
enemy. Important facts were posted previously. No properly
constructed power supply can damage RAM, motherboard, and
CPU. If one's observation are contrary, then one has
demonstrated how many computers are built by computer
assemblers with only a bean counter mentality. Computers
built on monetary considerations rather than using basic
technical knowledge. The lesson: buy power supplies that are
not dumped into the economy (because so many computer
assemblers don't have fundamental knowledge).

Important expression is 'over voltage protector'. Regardless
of voltage selector switch, no damage must occur beyond the
PSU. That was even required 30 years ago. Basic power supply
knowledge makes obvious what BigH2K posted:
If it was a decent quality PSU then all your components
should be fine, ...

Experience without fundamental knowledge can result in wild
and erroneous speculation. A power supply that damages
computer components was defective when purchased and exists
because the computer assembler never first learned basic power
supply fundamentals.
 
S

Stuffed

Fred Finisterre said:
Yeah, I was thinking that. i bought it from Ebuyer.com in the UK. Not only
was the voltage select switch set wrong, but it was suppled with a mains
cable that was wrong for the UK. I've noticed Ebuyer selling non-Brit stuff
before (I Bought a Creative MP3 player from them that had a US style mains
plug). I may try and claim from them, but they'll probably claim that there
there is a warning in the case manual (and to be fair there is). I've had
loads of PCs before, and they've either not had a voltage selector switch,
or if they have, it was set to 230V and I was lucky. I feel quite foolish
not to have spotted this.

Tis a silly thing to overlook, but I seem to recall reading other people had
done this on one of the Ebuyer product reviews, think it was one of the
cheap cases when I was looking for a PSU. So you're a bit daft, but on the
bright side, you're not the only one :)
 
T

Trout

I've never seen a computer power supply that did not include the 110/220
selector switch. What brand and model number is the one you know about that
is missing that switch?

My Zalman PSU doesn't have one. It automatically switches to needed
voltage.
 
M

Mike Tomlinson

Chris 159 <temp@cdelectri said:
i'm guessing you got a part of the mobo shorted to the chassis in which case
you'll be lucky if its only the mobo and psu gone.

Don't talk crap. A motherboard shorted to the case won't cause the PSU
to go bang. It'll go into current-limiting mode (if you listen to it,
you may hear it ticking quietly.)
 
M

Mike Tomlinson

Fred Finisterre said:
Yeah, I was thinking that. i bought it from Ebuyer.com in the UK. Not only
was the voltage select switch set wrong, but it was suppled with a mains
cable that was wrong for the UK. I've noticed Ebuyer selling non-Brit stuff
before (I Bought a Creative MP3 player from them that had a US style mains
plug). I may try and claim from them, but they'll probably claim that there
there is a warning in the case manual (and to be fair there is).

I disagree. If it's sold for use in the UK, it has to be suitable for
its intended market, therefore it should be sold with the switch
correctly set.

In your situation, I'd change the switch to 230V and raise a RMA with
ebuyer. Just say the PSU went bang on power up (this is a fairly common
failure mode even when the switch is correctly set); don't tell them the
switch was wrong.

The Antec True 380 is a nice PSU, it'd be worth getting a replacement
under warranty. They're almost 60 quid new.
 
Z

Zotin Khuma

....... said:
I am just putting into writing my own experiences. Would you rather me lie?

Speaking of personal experiences, here's mine. Three of the computers
I assembled for friends suffered lightning strikes this year, all of
them Athlon XPs linked by a neighborhood network.

The lightning bolt partially vapourised a (fortunately) disused
cordless phone antenna on the roof of one of them. Smoke rose from the
house and neighbors ran to see if anyone was hurt. One computer had a
discrete LAN card which was destroyed while the other two had
integrated LAN ports and the motherboards had to be replaced - mobo
chips were literally blown apart and the network switch was a charred
mess. But the CPUs and other components all survived and everything
ran as usual the next day.

Another computer, also an Athlon XP that I built for a local cable TV
company, was damaged last year in a freak accident that caused 60V AC
to be fed back to the computer via the video signal link. The mobo
also had chips blown up and had to be replaced along with the PSU, HDD
and RAM. The CPU survived and is still going strong today.
 
P

PawsForThought

From: Trout (e-mail address removed)
My Zalman PSU doesn't have one. It automatically switches to needed
voltage.

My Thermaltake psu doesn't have a switch either and is automatic.
 
D

Dorothy Bradbury

Most likely a voltage selection issue, or fault on the PCB.
o Very cheap PSUs have a horribly high DOA rate
o They often are not fully ATX compliant re protection

A quiet fizz is the filter, a louder noise the big primary electrolytics.

This is where ATX compliance matters :)
o ATX compliant PSUs should tolerate full circuit by shutting down
---- on removal of the short-circuit the PSU should be undamaged
o ATX compliant PSUs should not emit smoke, matter or such like
---- some smoke is however inevitable in some component failures
o ATX compliance says nothing about voltage selector protection
---- unfortunate, since 220V on 110V damages PSU primary side


I mention ATX as recoverable on short-circuit for another reason:
o Laptop-brick & DC-to-DC convertor boards are becoming popular
---- 120-200W in a tiny board board, £20 for 200W versions
o Many convertor boards are not quite ATX compliant
---- short-circuit is triggered at 120-200%, but is non-recoverable

Using a big 12V Industrial/DIN fanless PSU you can power many PC
boards silently, but short-circuit protection needs careful thought.

Hopefully damage is limited to the PSU.
 
T

Terry

Speaking of personal experiences, here's mine. Three of the computers
I assembled for friends suffered lightning strikes this year, all of
them Athlon XPs linked by a neighborhood network.

The lightning bolt partially vapourised a (fortunately) disused
cordless phone antenna on the roof of one of them. Smoke rose from the
house and neighbors ran to see if anyone was hurt. One computer had a
discrete LAN card which was destroyed while the other two had
integrated LAN ports and the motherboards had to be replaced - mobo
chips were literally blown apart and the network switch was a charred
mess. But the CPUs and other components all survived and everything
ran as usual the next day.

Another computer, also an Athlon XP that I built for a local cable TV
company, was damaged last year in a freak accident that caused 60V AC
to be fed back to the computer via the video signal link. The mobo
also had chips blown up and had to be replaced along with the PSU, HDD
and RAM. The CPU survived and is still going strong today.

That's nothing, When i was serving over in Iracq i had an AMD based field
laptop top take a direct hit from a scud missile- then run over by a
(friendly) tank- all that was visibly left was the smoking AMD chip- apart
fron one slightly bent pin it was fine! - got it in my PC right now sending
this post!....;-)...
 
M

Martin G.1.0

Zotin Khuma said:
Speaking of personal experiences, here's mine. Three of the computers
I assembled for friends suffered lightning strikes this year, all of
them Athlon XPs linked by a neighborhood network.

The lightning bolt partially vapourised a (fortunately) disused
cordless phone antenna on the roof of one of them. Smoke rose from the
house and neighbors ran to see if anyone was hurt. One computer had a
discrete LAN card which was destroyed while the other two had
integrated LAN ports and the motherboards had to be replaced - mobo
chips were literally blown apart and the network switch was a charred
mess. But the CPUs and other components all survived and everything
ran as usual the next day.

Another computer, also an Athlon XP that I built for a local cable TV
company, was damaged last year in a freak accident that caused 60V AC
to be fed back to the computer via the video signal link. The mobo
also had chips blown up and had to be replaced along with the PSU, HDD
and RAM. The CPU survived and is still going strong today.

I once had a bolt of lightning shoot out of my floppy drive, bounce off my
cat, and then into my dog. Now my dog can fly, and my cat can make herself
invisible whenever she wants to. Oh yeah, now both the dog and cat are able
to talk now too.
;-)
 
L

Lordy

I disagree. If it's sold for use in the UK, it has to be suitable for
its intended market, therefore it should be sold with the switch
correctly set.

I'm inclined to believe this. I cant provide any good links but generally
if you sell electrical stuff the end user should be able to plug it in with
no electrical risk. (One reason why we dont have to wire plugs anymore (*)
) Suppose something flew off and blinded the OP? If things are inclined to
bang when plugged in then the seller is responsible. IMO


(*) Those were the days. Trimming each wire to their different lengths.
Maknig sure the plug had a firm grip of the sleeve wire ..
 
B

BigH2K

Mike Tomlinson said:
I disagree. If it's sold for use in the UK, it has to be suitable for
its intended market, therefore it should be sold with the switch
correctly set.

In your situation, I'd change the switch to 230V and raise a RMA with
ebuyer. Just say the PSU went bang on power up (this is a fairly common
failure mode even when the switch is correctly set); don't tell them the
switch was wrong.

The Antec True 380 is a nice PSU, it'd be worth getting a replacement
under warranty. They're almost 60 quid new.

Not to mention that they're a customised version designed for extra
quietness.
 
B

BigH2K

Martin G.1.0 said:
I once had a bolt of lightning shoot out of my floppy drive, bounce off my
cat, and then into my dog. Now my dog can fly, and my cat can make herself
invisible whenever she wants to. Oh yeah, now both the dog and cat are
able to talk now too.
;-)

Jesus you too were lucky, I once had this nuclear reactor go into
meltdown......
 
J

John Doe

Troll.

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From: "TMack" <[email protected]>
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Subject: Re: If a just built PC goes bang on power-up...
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Top-posting weirdo!

Tony
 
J

John Doe

Troll.
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Date: Tue, 23 Nov 2004 20:19:15 +0000
From: Mike Tomlinson <[email protected]>
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*plonk*
 

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