Dead Motherboar??

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woof! said:
Please Help??
Click to expand...

I don't know enough about PSU voltages but Green dropping from 5.28V to
0.08V on power up looks decidedly dodgy to me. Either the PSU is faulty or
you damaged something on the mobo when fitting the new heatsink and fan.

As your problem is not a hardware issue with WindowsXP you'd be better off
posting to a NG such as uk.comp.homebuilt

HTH

Godfrey
 
Godfrey said:
I don't know enough about PSU voltages but Green dropping from 5.28V to
0.08V on power up looks decidedly dodgy to me. Either the PSU is faulty or
you damaged something on the mobo when fitting the new heatsink and fan.

As your problem is not a hardware issue with WindowsXP you'd be better off
posting to a NG such as uk.comp.homebuilt

HTH

Godfrey
Click to expand...

Green is PS_ON#. It is a logic signal. +5V level means "OFF". A voltage
near zero volts means "ON". The signal is sent by the motherboard, to
the PSU. That part is normal.

Orange is the 3.3V rail. A value of 3.98 is too high. 3.3V +/- 5% has
been exceeded.

The specs here are in chronological order. The power supply in question
could be one of the last two links.

http://web.archive.org/web/20030424...org/developer/specs/atx/ATX_ATX12V_PS_1_1.pdf
http://www.formfactors.org/developer/specs/atx/ATX12V_1_3dg.pdf
http://www.formfactors.org/developer/specs/ATX12V_PSDG_2_2_public_br2.pdf

I'd be reaching for my spare power supply at this point. Unless you
want to spend more time poking the thing with the multimeter.

Either the 12V rail is heavily loaded, or there is a rail to rail fault
that is causing the 3.3V to go out of regulation (lifting the rail). If
the spare power supply displays the same voltage pattern (3.3V too high),
debugging what is wrong is going to get a lot tougher. At that point, I'd
be using a clamp-on DC ammeter to check the magnitude and direction of
current flow for each rail.

Paul
 
Thanks
i shall take a good look at this tonight.
Let you know more when I have got my head around it
if it makes any difference the power supply (which was bought just 4 weeks
ago from maplin) is a ATX-500TD "X-Power"

36A on +3.3V and on +5V
20A on +12V
1A on -5V and -12V
2A on +5Vsb

thanks again
 
Woof

Take care how you deal with the power supply unit if you wish to make a
warranty claim.


--



Hope this helps.

Gerry
~~~~
FCA
Stourport, England
Enquire, plan and execute
~~~~~~~~~~~~~~~~~~~
 
I would look carefully around the cpu socket to see if you perhaps shorted
something w/ the new heatsink. Or the cpu may be twisting in the socket
because of an alignment issue w/ the new heatsink, causing a pin contact
issue.

good luck
 
Had chance to have another look. Had a very close inspection of the
motherboard and see nothing untoward. looked at the CPU again everything
looks as it should. Re-tested the voltages and got the following:-
Purple: 5.16V
Grey:0.00 rising to 4.96V when power on
Red: 0.02 rising to 5.14V when power on
Orange: 0.00 rising to 3.36V when power on
light Grey moving from 0.00 to -4.9V when power on
Green 5.16 dropping to 0.04V when power turned on
Blue: 0.00 dropping to -11.8V when power turned on

This all looks to agree with guidance. Admittedly slightly less than I
measured last night but that may well be due to a stressful day!?!!

Thinking of ordering new CPU and motherboard and working off that.
Disconnected and reconnected graphics just to see if that made any difference
and it didn't.

Anyone got ay more ideas? all appreciated, especiallu help so far - thanks!
 
woof! said:
Thanks
i shall take a good look at this tonight.
Let you know more when I have got my head around it
if it makes any difference the power supply (which was bought just 4 weeks
ago from maplin) is a ATX-500TD "X-Power"

36A on +3.3V and on +5V
20A on +12V
1A on -5V and -12V
2A on +5Vsb

thanks again
Click to expand...



woof! said:
Had chance to have another look. Had a very close inspection of the
motherboard and see nothing untoward. looked at the CPU again everything
looks as it should. Re-tested the voltages and got the following:-
Purple: 5.16V
Grey:0.00 rising to 4.96V when power on
Red: 0.02 rising to 5.14V when power on
Orange: 0.00 rising to 3.36V when power on
light Grey moving from 0.00 to -4.9V when power on
Green 5.16 dropping to 0.04V when power turned on
Blue: 0.00 dropping to -11.8V when power turned on

This all looks to agree with guidance. Admittedly slightly less than I
measured last night but that may well be due to a stressful day!?!!

Thinking of ordering new CPU and motherboard and working off that.
Disconnected and reconnected graphics just to see if that made any
difference
and it didn't.

Anyone got ay more ideas? all appreciated, especiallu help so far -
thanks!
Click to expand...


woof:
It's really hard, if not impossible, to determine what is the cause of your
problem without replacing each major component on a one-by-one basis. It
might be the PSU, or something went awry when you replaced the CPU fan &
heatsink. Or it could be the motherboard itself. There's really no
definitive way of telling by the end-user without the replacement of
components as I've indicated.

Anyway...

You indicate the problem arose when you installed your new HDD to replace
the "failed" one. I take it there's little doubt in your mind that the
*previous* problem you were experiencing was due to a defective HDD, and has
*nothing* to do with your present problem, right?

So after installing the new HDD you booted with your XP installation CD to
install the OS, that's when the problem arose. When you say the system
"wouldn't boot ", you mean it wouldn't boot to the XP installation CD,
right? You never were able to get as far as installing the OS, right? I
assume you don't have another HDD with a functioning OS on it, do you?

Anyway...

I know I don't have to tell you that you're dealing with a pretty old
motherboard, do I? That ASUS board *was* a fine MB in its day, but
truth-to-tell its day has kind of come & gone. If the system is working and
meets your day-to-day needs with that MB, fine. But since you've indicated
you're thinking of a new motherboard & processor, is there any chance you
could *really* upgrade your system with a new more up-to-day MB & processor,
etc. (At least you have a new HDD, right?). If you could (financially) swing
to a new system, I really think that's the way to go at this point.
Anna
 
Wise words!!
I am a bit like a dog and his bone - I dont want to let go and let this
beat me. I was looking at a slightly better motherboard the A7n8X and CPU to
match as it would let me use all my existing cards etc.
Don't suppose you could offer an opinion as to if I am continuing to wade
through mud?
 
woof! said:
Wise words!!
I am a bit like a dog and his bone - I dont want to let go and let this
beat me. I was looking at a slightly better motherboard the A7n8X and CPU
to
match as it would let me use all my existing cards etc.
Don't suppose you could offer an opinion as to if I am continuing to wade
through mud?
Click to expand...


I have worked with the ASUS A7N8X-E Deluxe board and it's a nice stable MB.
As a matter of fact we've installed that board in a number of machines. It
has SATA capability of course (only two SATA connectors but I assume your
present HDD is a PATA one and you're not particularly interested in the SATA
interface at this time). As I recall we installed the AMD Athlon XP 3200
(2.2 GHz) processor and a NVIDIA GeForce 6600 GT video card in those
machines a few years ago. It's obsolete by today's standards but it is
serviceable assuming your needs are relatively modest. I would guess you
should be able to pick up that board for well under $50 (I wouldn't pay more
than that) assuming you could even find it from some online vendor.

Other than that, take a look at the offerings at newegg (among others)
before you make your final choice.
Anna
 
You have a dead motherboar? Call the humane society, the zoo, and
your local environmental protection agencies and groups. Try to save
her baby boars.
 
Thanks for comments. Just to complete the picture I had earlier had a failed
350W PSU and replaced that with a 500W PSU then decided to upgrade a number
of components. These included more RAM, better graphics, quieter fans and why
not add a second bigger hard drive. I made my previous one the slave but made
it a logical drive off an extended partition. When the new hard drive failed
I had it confirmed by the supplier who sent me a replacement. It was at this
stage that when i placed the replacement drive in that I ended up in this
problem. I had tried to put the slave in reconfigured as the master but kept
getting a basic message "press any key to reboot" nothing else, couldn't even
get to the bios. In between waiting for the new drive to arrive i fitted the
quieter CPU fan.
so when i started everything up i got no response.
Have you ever tried one of these PCI post diagnosti cards?
 
Godfrey Wilkes said:
I don't know enough about PSU voltages but Green dropping from 5.28V to
0.08V on power up looks decidedly dodgy to me. Either the PSU is faulty or
you damaged something on the mobo when fitting the new heatsink and fan.
Click to expand...

Why don't you find out what you are talking about before posting complete
shite.

The green wire is the 'Power On' connection. It is connecting this wire to
ground that causes the power supply to supply all the other voltages (except
the 5v STBY line which should always be powered).
 
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