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Gil Theissen
Guest
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 Posted: Sun Dec 28, 2003 3:53 am Post subject: can a bad cpu smoke a power supply? |
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I bought a used Athlon 850 awhile ago and finally got around to testing
it on a used and untested socket A that I bought today. The system didn't
boot and since I'd already tested everything else I figured either the board
was bad or the cpu. So I opened up my regular box running an Athlon 1.33G
and put in the 850. Fans spun, but screen was black and after 7-8 seconds
the board (Epox 8KHA+) shut itself off.
Figured it was some protective mechanism and this demonstarted that the
cpu was bad,. So I put my regular Athlon back in the EPOX and...nothing. No
fans, no lights, nothing. Naturally I freaked, but after I calmed down, I
checked the power supply and it was dead - no juice coming out of any
channels.
I swapped out another P/S and now I'm fne, but now I don't know what the
heck happened. Did my Epox fail to boot because it was in the midst of a
coincidental failing power supply and thus, the 850 might still be good? Or
can a bad cpu potentially kill a power upply? I don't see how but I'm sure
not trying the experiment again until I get plenty of assurances that it was
purely coincidental.
Thanks - Gil Theissen |
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techforce
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| Posted: Sun Dec 28, 2003 4:11 am Post subject: Re: can a bad cpu smoke a power supply? |
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A Main board Cant Burn out a PS....at least in normal Circumstances.
The protection Circuitry in the PS will bring the PS into Internal Shutdown
when an overload Is Present. UNLESS the PS overload circuity is Defective.
My Guess is there may be some Pin Differences in the 1.33 Vs. The 850. Final
Test would be Verifying the PS in the 1st TEST is Good. IF son, then that
leaves 4 Possibiliies.
1) Defective CPU
2) Defective Board
3) defective CPU and Board
4) Board & CPU Mismatch
That PS May Very well be good that you determined to be non working.
Depending on Design, there is a Delay before the overload Trip Circuits will
reset for another Operation.
"Gil Theissen" <giltheissen@prod-a-gee.net> wrote in message
news:7bnHb.44905$%q3.27360@newssvr31.news.prodigy.com...
| Quote: | I bought a used Athlon 850 awhile ago and finally got around to
testing
it on a used and untested socket A that I bought today. The system didn't
boot and since I'd already tested everything else I figured either the
board
was bad or the cpu. So I opened up my regular box running an Athlon 1.33G
and put in the 850. Fans spun, but screen was black and after 7-8 seconds
the board (Epox 8KHA+) shut itself off.
Figured it was some protective mechanism and this demonstarted that
the
cpu was bad,. So I put my regular Athlon back in the EPOX and...nothing.
No
fans, no lights, nothing. Naturally I freaked, but after I calmed down, I
checked the power supply and it was dead - no juice coming out of any
channels.
I swapped out another P/S and now I'm fne, but now I don't know what
the
heck happened. Did my Epox fail to boot because it was in the midst of a
coincidental failing power supply and thus, the 850 might still be good?
Or
can a bad cpu potentially kill a power upply? I don't see how but I'm sure
not trying the experiment again until I get plenty of assurances that it
was
purely coincidental.
Thanks - Gil Theissen
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Gil Theissen
Guest
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| Posted: Sun Dec 28, 2003 6:08 am Post subject: Re: can a bad cpu smoke a power supply? |
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| Quote: | My Guess is there may be some Pin Differences in the 1.33 Vs. The 850.
Final
Test would be Verifying the PS in the 1st TEST is Good.
I wouldn't have thought a bad board or cpu would do that, either but it |
happened. Whether it was a coincidence or not is the question.
My Epox auto-selects the voltage and it supposed to be able to handle an
850. The P/S that I ran the first test, checks out fine with my multi-meter
and it's the one swapped out and put in the computer I'm using now.
| Quote: | That PS May Very well be good that you determined to be non working.
Depending on Design, there is a Delay before the overload Trip Circuits
will
reset for another Operation.
Just to be on the safe side, I retested the bad P/S again three hours later, |
and it's still deader than a doornail. A couple of the channels are putting
out .01-.02 volts and the rest aren't putting out anything.
Which brings me back to my orginial question of whether or not a bad cpu can
blow a P/S? Your earlier answer suggested a 'board' can't do it (although
you did imnply tha a board could cause it to temporarily overload), but what
about a bad cpu?
Thanks -- Gil Theissen |
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larrymoencurly
Guest
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| Posted: Thu Jan 01, 2004 9:03 am Post subject: Re: can a bad cpu smoke a power supply? |
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"Gil Theissen" <giltheissen@prod-a-gee.net> wrote in message news:<7bnHb.44905$%q3.27360@newssvr31.news.prodigy.com>...
| Quote: | I bought a used Athlon 850 awhile ago and finally got around to testing
it on a used and untested socket A that I bought today. The system didn't
boot and since I'd already tested everything else I figured either the board
was bad or the cpu. So I opened up my regular box running an Athlon 1.33G
and put in the 850. Fans spun, but screen was black and after 7-8 seconds
the board (Epox 8KHA+) shut itself off.
Figured it was some protective mechanism and this demonstrated that the
cpu was bad,. So I put my regular Athlon back in the EPOX and...nothing. No
fans, no lights, nothing. Naturally I freaked, but after I calmed down, I
checked the power supply and it was dead - no juice coming out of any
channels.
I swapped out another P/S and now I'm fne, but now I don't know what the
heck happened. Did my Epox fail to boot because it was in the midst of a
coincidental failing power supply and thus, the 850 might still be good? Or
can a bad cpu potentially kill a power upply? I don't see how but I'm sure
not trying the experiment again until I get plenty of assurances that it was
purely coincidental.
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What brand and model PSU is it?
A bad CPU can't kill normal PSU that was built right, but some PSUs
will blow, despite being advertised as having protection against
overcurrent. For example, I had a really cheap 250W blow its +3.3V
rail when a friend of mine managed to plug in a DIMM backwards, but
other PSUs just shut down when I accidentally shorted them.
Here's a table showing the power that different CPUs consume:
http://users.erols.com/chare/elec.htm |
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Gil Theissen
Guest
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| Posted: Thu Jan 01, 2004 5:02 pm Post subject: Re: can a bad cpu smoke a power supply? |
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The P/S was a 400 watter but wasn't a brand name that I recognized. Some
company from Thailand (I already tossed the P/S) I believe. Anyway, I'm
slowly coming to believe that my experience may have been the result of a
bad cpu blowing an otherwise cheaply made P/S.
On the other hand, I'd sure like to know how your friend managed to
shove - and lock down!! - a DIMM in the reverse position.
Thanks -- Gil Theissen
| Quote: | What brand and model PSU is it?
A bad CPU can't kill normal PSU that was built right, but some PSUs
will blow, despite being advertised as having protection against
overcurrent. For example, I had a really cheap 250W blow its +3.3V
rail when a friend of mine managed to plug in a DIMM backwards, but
other PSUs just shut down when I accidentally shorted them.
Here's a table showing the power that different CPUs consume:
http://users.erols.com/chare/elec.htm |
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larrymoencurly
Guest
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| Posted: Fri Jan 02, 2004 3:57 pm Post subject: Re: can a bad cpu smoke a power supply? |
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"Gil Theissen" <giltheissen@prod-a-gee.net> wrote in message news:<N6TIb.46068$Hz4.28763@newssvr31.news.prodigy.com>...
| Quote: | What brand and model PSU is it?
The P/S was a 400 watter but wasn't a brand name that I recognized.
Some company from Thailand (I already tossed the P/S) I believe.
Anyway, I'm slowly coming to believe that my experience may have
been the result of a bad cpu blowing an otherwise cheaply made P/S.
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I haven't seen that many PSUs, but the only Thailand-made ones I know
of were really good brands, like NMB and Delta (AKA Acer).
| Quote: | On the other hand, I'd sure like to know how your friend managed to
shove - and lock down!! - a DIMM in the reverse position.
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I thought that it was impossible, too, but I guess that the mobo and
socket bent enough upward to allow the tabs to be locked. One MOSFET
was blown in the PSU, but fortunately a dud mobo of mine had almost
the same kind on it. |
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