Motherboard gradually loosing northbridge functions and then goes on to loose sound too

Oct 1, 2014
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I have a Biostar GF5070-M7 motherboard that first refused to boot unless not in dual-channel, yet worked with two different sticks for a while. When I say "worked" I mean it does it's job except it freezes every hour or so ever since, but I am still posting from it now. Then after a while it stopped booting unless I took out one of the sticks. Then a few weeks later I had to remove the external video-card to get it working... and today I lost sound.

As far as I understand the first things that had issues had to do with the northbridge and the newest which is sound is the south - with lan and sata still working for now.

Somehow something gradually eats away at my mobo... north to sound... and maybe someone might be able to tell me what exactly could be culprit or where to look for answers. I could get a replacement but I'd rather get my hands dirty with solder if possible. Any ideas ?

edit: it's not the PSU. and I can't see swolen capacitors either.

update: it seems that the northbridge and southbridge are one and the same chip for this board.
 
Solution
I think I would replace thermal compound on the northbridge and look over the motherboard for any leaky or swollen capacitors (those are about the only thing somewhat easily replaceable). Other than that, check your PSU's voltages and look for damaged/burnt traces on the motherboard (likely that wouldn't be repairable)

Afterthought edit: I'm going with the PSU's 3.3V being bad
I think I would replace thermal compound on the northbridge and look over the motherboard for any leaky or swollen capacitors (those are about the only thing somewhat easily replaceable). Other than that, check your PSU's voltages and look for damaged/burnt traces on the motherboard (likely that wouldn't be repairable)

Afterthought edit: I'm going with the PSU's 3.3V being bad
 
Solution
Oct 1, 2014
28
0
4,530
Unfortunately it's not as simple. I checked for swallen capacitors already and even changed the PSU. Both PSUs are fine - at least the values I've seen in BIOS are more than ok - I'm not sure if that's idle or being under load would be different, but as I said, I tried two.
 
Oct 1, 2014
28
0
4,530
Nothing's leaking, but I heard they might have dried up actually. So could it be that simple ? Capacitors ? Will I gain my sound back after ? I could actually get my hands on another defective board just like this and replace them.

Thank you for your suggestion, but I'm afraid I gave you a short name of the MB. Apparently, there's an extra string or two, and that makes mine Intel based. But for suggestions I might open another thread.

What I'm really curious about is if anyone out there has a clearer idea of what's going on with my mobo.