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Motherboard won't boot with Antec smartpower 2

Posted on 2010-01-02
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Last Modified: 2013-12-11
I'm trying to put an AMD 64 4000+ CPU and Gigabyte GA-K8NXP-9 mainboard into an Antec Sonata II case (Containing an Antec Smartpower 2 PSU).

When I switch on the power, the CPU fan starts up but it keeps pulsing: going up to full speed then dropping back again.  There are no beeps, but the speaker constantly emits ticking sounds about 2 times a second.  The system doesn't boot at all.

To try to isolate the problem I've removed all peripherals and the graphics card.

I've used another PSU (450W Tagan) to run up the motherboard/processor without any problems.

I've also used the Antec PSU to run up an older AMD motherboard/processor.

I'm stuck.  The only thing I can think of is that the PSU isn't powerful enough to run up the motherboard and processor I'm trying to use.  But that seems surprising since I thought the Antec Truepower II was quite a high quality PSU.  

Can anyone help me solve this problem?



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Question by:Dawkins
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13 Comments
 

Expert Comment

by:d200512
ID: 26161760
Your are saying you have psu Tagan (450W), so how much W does Antec Truepower II psu have?
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Author Comment

by:Dawkins
ID: 26161817
The Antec is also 450W.  I've attached their specs.  I'm not sure which voltage is the important one in this situation.


        +5v  +3.3V  +12V1  +12V2   -12V   +5V SB
Antec   30A   32A    15A    17A    0.3A    2.0A  
Tagan   48A   28A    28A     -     1.0A    2.5A

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Expert Comment

by:PCBONEZ
ID: 26162618
Antec Smart Powers were blessed with Fuhjyyu capacitors [as were most True Power variations and a few other Antec models.]

- Fuhjyyu are probably the worst capacitors ever used in any power supply - EVER.
http://www.google.com/#hl=en&q=fuhjyyu+antec&aq=&aqi=&oq=&fp=b36c7832dbb01be6

It's not uncommon for PSU's equipped with Fuhjyyu caps to damage a motherboard beyond repair.
- If you look hard enough you'll find a few reports of Fuhjyyu equipped PSUs causing the system [and sometimes the house] to catch fire.





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Expert Comment

by:_
ID: 26164340
Something else to check is if the (usually) White wire is missing from the Smart Power and is there one the Tagan.
With the locking clip facing up, and starting from the left, it should be something like:  
orange - blue - black- green - black - black - black - white (or empty) - rest of the wires

Some mobos are picky about the White wire being there, or they will not boot.
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Expert Comment

by:_
ID: 26164355
make that -- With the locking clip facing you, and the wires as the "top"... --
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Expert Comment

by:PCBONEZ
ID: 26164483
The White wire is -5 volts DC.

-5 Volts DC is only used by motherboards with ISA slots .... More correctly an ISA BUS....
... very few early P4 boards had an internal ISA BUS [the BUS but no ISA Slots] to support using cheap 16-bit ISA based chips [for sound and IDE controllers as I recall] that were soldered directly onto the motherboard.
I'm 90% sure MSI was the only one that cheaped out by using obsolete chips that way.

Gigabyte GA-K8NXP-9 doesn't use -5 Volts DC.
The chipset is an NVIDIA nForce4 which does not support an ISA BUS.
.
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Expert Comment

by:_
ID: 26164530
>> More correctly an ISA BUS....

ahhhh... that might explain it. I mostly noticed it on a few SocketA and 370/478 mobos. Some had ISA slots, some didn't.
Thanks.   : )
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Expert Comment

by:nobus
ID: 26164829
check if you did not short the mobo on the mounting standoffs -  each one should correspond to a hole  !
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Author Comment

by:Dawkins
ID: 26170156
Thanks for the comments.  

The motherboard isn't damaged because I can still boot it using a different PSU.  This also rules out a short somewhere  The PSU isnt damaged either because it will boot a different (ASUS) motherboard with a lower speed CPU.

I'm going to try putting the CPU I'm trying to use into the ASUS motherboard.  Maybe there is some strange compatability problem between the gigabyte motherboard and the Antec PSU.

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Expert Comment

by:Callandor
ID: 26170675
The biggest difference between the Tagan and the Antec is the +12v rail(s), which is used to start up the cpu.  The Tagan seems to have a single high current rail, while the Antec splits it into two lower curent ones.  Another high-quality manufacturer, PC Power & Cooling, also follows this practice of a high current single rail.  This Tagan power supply may have a switch to allow combining or splitting the +12v rails.
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Expert Comment

by:PCBONEZ
ID: 26174584
That Antec PSU has Fuhjyyu capacitors. - It is BAD. - End of story.
Even if it still 'seems' to work and the DC voltages measure correct, it is literally PUMPING noise [ripple] into you motherboard's power plane.
I've seen Fuhjyyu/Antecs literally blow holes in chipsets. - At the very least the system will be unstable and erratic.
[Tagan probably isn't much better but I don't know Tagan that well.]
-
Techs that know their way around the INSIDE of a PSU will pull those with Fuhjyyu caps out of service ON SIGHT and either trash them or replace the caps. [Antecs are considered worth recapping because they are excellent units when you get rid of the cheap caps.]
-
http://www.badcaps.net/forum/showthread.php?t=8403&highlight=Antec+Fuhjyyu
http://www.hardforum.com/archive/index.php/t-1072298.html
http://www.badcaps.net/forum/showthread.php?t=8385&highlight=Antec+Fuhjyyu
http://www.badcaps.net/forum/showthread.php?t=8024&highlight=Antec+Fuhjyyu
http://forums.overclockersclub.com/lofiversion/index.php/t72660.html
- There are literally 1000's of complaints out there about Antec/Fuhjyyu PSUs.
-

TP2-550-5vsb.jpg
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Expert Comment

by:PCBONEZ
ID: 26174714
[Previous photo.]
You Smartpower II uses the same +5vsb as these other models.
- When the +5vsb caps finally 'go' they often take out the motherboard's chipset.
- The one in the photo did in fact literally blow a small hole in the motherboard's chipset.

The next two photos are of the final output filter caps.
The Fuhjyyu's in the Antec TP2-550EPS12V bloated and leaked in the box on the self.
[I know this for a fact. I'm the one that broke the factory seal on the box.]

The 380 watt wan't mine. Just another example of blown Fuhjyyu in Antecs.
- They failed in 9 months on that one.
.
TP2-550EPS12V-.jpg
ANTEC-True-380.JPG
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Accepted Solution

by:
Dawkins earned 0 total points
ID: 26212052
Well, I finally solved the problem: for some reason the Antec PSU and Gigabyte motherboard wouldn't work together.  I switched the Gigabyte motherboard for an Asus one and reinstalled the CPU on that motherboard and it all worked without problems.

I accept what you're saying about the Antec's capacitors, but the gigabyte motherboard hasn't been damaged by the Antec PSU at all - it still boots with the Tagan.
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