SouthBridge failer? caused by CPU?

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J_A_C_K_7504

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Nov 10, 2013
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Hi,

On my computer I have faint lines moving up and down my screen. I have had this problem for a while now and have noticed it slowly getting worse(the lines becoming more clear).

I first noticed the problem on the first motherboard(Gigabyte GA-990FXA-UD7) where for about 7 months the problem slowly got worse before all the PCIe slots failed. On later inspection I removed the motherboard cooler to find the Southbridge had burnt out(I could smell it had burnt out from a small distance). Now with my new motherboard(Asus Crosshair V formula-z) the same problem has returned(have not reached the point where the Southbridge fails completely).

So far I have tested different screens and different graphics cards and then in different PCIe slots. I have also just changed my CPU as I blamed that as from my knowledge that is the only component that can control what the SB does(from diagrams it is linked).

Before I change my motherboard again can someone confirm it was the CPU that was the sauce of the problem, and if not what component could cause it.

Thanks

specs:

Asus Crosshair v formula-z
AMD FX 8350 (none O/C)
8GB(2x4) DDR3 RAM (O/C to 1600MHz)
650W power supply
AMD Radeon HD 5400 Series (place holder until I can afford a R9 290)
win 8
2x 500GB HDD
 
Solution
N
The info i`v post you above it the close to the problem you describe
2 different motherboard with the same burn chip problem mean that you have common efect on both motherboards - nothing else can make you mobos to go bad in the same way as the problem i`v pointed
Atleast i can`t figure out other scenario .....
It could be a bad wall power outlet - check the grounding
It could be a bad power strip
It could be bad PSU
It could be a bad HDD or USB device - the have theyr connections trough the south chip - consistent overload , over heat or bad poor grounding effect electrical failures can lead to chip failures and bad smell
It could be just high USB current draw from you Hauppauge HD PVR - they have 2 pins power cables on their...
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Nikolay Savov

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Hi
I will blame the CPU at last place ....... if i ever blame the CPU for "burn out " south bridge controller" ........

As long i have you story :
- you have burn south bridge chip on 2 different motherboards ?
to try to help ya i need this :
what are the common components that you have used on both motherboard ?
is there any periferial device connected to both cases - some HD TV , Printer etc. ....
is there a common power source for you PC and all that is connected to the PC - monitor , periferial devices ?
 
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J

J_A_C_K_7504

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Nov 10, 2013
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with both motherboards I have kept the same power supply, same CPU(until a few days ago), the same HDD's, the same graphics card(but have tried different ones for short periods of time),disk drive(but was changed 10 days ago), the same monitor, keyboard and mouse, Hauppauge HD PVR plugged into one USB port(but not always on).

My computer is plugged into a wall socket(UK) -Is this what you mean by a common power source?

I have also run CPU-z with everything normal but one power consumption is 3.13v when it should be 3v (I expect this is just a miss reading)
 
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Nikolay Savov

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That is what bothers me !
Is this Hauppauge HD PVR connected to the same 220V power outlet from the wall as the PC ?

The common problem is that :
If you plug you PC to power outlet on the wall - f.e. Power Source 1 - and if you plug any other Device ( Hauppauge HD PVR , HD TV , Printer, Scanner , Active Speacers and etc. ) to the other power outlet on the wall - ( f.e. Power Source 2 )
when you connect devices from PWR Source 2 to the PC by the USB or any other cable than Optical Cable you are making interfacial electrical circuit and you`r making electrical common ground connection.
Now to make it simple :
This connection scenario can lead to VERY SERIOUS DAMAGE - to the motherboard , GPU or PSU or to all of them .....
This is even a base to Warranty Rejections if you have some Warranty LA .....

So in you case i belive connecting this Hauppauge HD PVR have you trouble .... and becouse you have being connected by the USB the South bridge chip gone bad - the bad curent have pass through it.

If you disconnect all 220V cables and connect them to ONE power strip like this one f.e :
http://www.newegg.com/Product/Product.aspx?Item=N82E16812132005

and then you conect to 1 Power Source to the Wall - YOU`R BE OK for you next PC !

I hope i`v helped !
 
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J

J_A_C_K_7504

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Nov 10, 2013
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If you mean connect all equipment to 1 power splitter then that's what I've done, and how its always been.

 
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Nikolay Savov

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Apr 9, 2013
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The info i`v post you above it the close to the problem you describe
2 different motherboard with the same burn chip problem mean that you have common efect on both motherboards - nothing else can make you mobos to go bad in the same way as the problem i`v pointed
Atleast i can`t figure out other scenario .....
It could be a bad wall power outlet - check the grounding
It could be a bad power strip
It could be bad PSU
It could be a bad HDD or USB device - the have theyr connections trough the south chip - consistent overload , over heat or bad poor grounding effect electrical failures can lead to chip failures and bad smell
It could be just high USB current draw from you Hauppauge HD PVR - they have 2 pins power cables on their adapters and maybe the all grounding is transported trough the USB port ....


I`m not sure what exactly is the cause - i cant test you system and you environment - but i`m sure for this :
If you replace you CPU you will NOT fix the problem
If you replace the motherboard you will fix the problem but not the cause .....

I hope you manage to figure out this !
 
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Solution
J

J_A_C_K_7504

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Nov 10, 2013
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Thanks for the help you've given me, I will start to test the possible causes you've given me when possible.
 
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J

J_A_C_K_7504

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Nov 10, 2013
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I changed the socket the computer was plugged into and I see a improvement, so I guess this was the problem all along.

Thank you for your help

 
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Nikolay Savov

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Damn i hate to be right some times :)
I`m glad you `v sort it out !

P.S. - i completely forgot to tell you to use the 220V-250V CIRCUIT TESTER - just simply touch the PC case with the tester - pick some of the bolt on the back of the PC - and if you tester got light up you have big problem :)
You can have this on mind :)
 
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