Question ASUS motherboard won't post with 2nd CPU ?

[exocomp]

Hi guys,

I've had an ASUS server RS926-E7/RS8 which I've managed for close to 7 years now (out of warranty). It's been great however a couple days ago the server shutdown on its own and now powers on but will not post.

Upon troubleshooting I found that the pins on the heat sink above the CPU had broken and popped off and the spring of the pin perhaps had created a short.

So I decided to take the 2nd CPU off and the server now posts just fine. I tested that CPU by itself and it works. So the issue is the 2nd CPU socket.

However, I'm now left with no being able to use the 2nd CPU socket and this is where I need help with identifying a component that most likely burned out.

Here is a picture of it: https://ibb.co/fQ7SdP4

As you can see in that image there is a component marked "R10A 1227" which looks discolored which I think is most likely dead, any idea what this component is?

Is that a resister or inductor or something else. Any insight into this is much appreciated.

 

[Eximo]

Well, that is a coil/choke of some sort. Which is effectively a lump of copper encapsulated so that isn't too likely to have actually burned up. More like it was the source of the discharge which burned up other things. I see a lot of surface mount capacitors there, likely in parallel, but you would have to measure that to be sure.

Might be best to remove it and the other one and compare them with a simple resistance test, unless you happen to have an inductance option on your multimeter.

As to the expected value, 0.1uH I think. The A designation may mean a very low tolerance allowed, not entirely sure.

 

[exocomp]

Well, that is a coil/choke of some sort. Which is effectively a lump of copper encapsulated so that isn't too likely to have actually burned up. More like it was the source of the discharge which burned up other things. I see a lot of surface mount capacitors there, likely in parallel, but you would have to measure that to be sure.

Might be best to remove it and the other one and compare them with a simple resistance test, unless you happen to have an inductance option on your multimeter.

As to the expected value, 0.1uH I think. The A designation may mean a very low tolerance allowed, not entirely sure.

Thanks for the reply, the R threw me off initially I thought it might be a resister but I think you're right its an inductor. I have a multimeter on hand but it doesn't measure capacitance or inductance.

I found a fairly cheap LCR meter on amazon so I might go with buying one and like you mentioned test it and those surface mount capacitors.

As to the expected value, 0.1uH I think.

Btw, what makes you think its that?

 

[Eximo]

A long rabbit hole of trying to figure it out. Still not 100% sure.

R is the decimal place, universally agreed upon. Given the rough size, it has to be uH, I can't see a nH choke being in there.
First number is treated as such.
Decimal point, 1, no zeros, A.

R10A
1227

I did find a list of the letters normally used to designate tolerance, but it starts at B. A may mean 0% tolerance? I wouldn't think so. I could find no definite answer. If it were in my hands I would de-solder it and measure.

1227 as far as I can tell is unique to the manufacturer, might designate package size as you have some larger ones nearby with 1226 on them.

Surface mount electronics move too quickly for me to keep up with these days. Never really got beyond the hobby enthusiast level myself. Sadly most parts catalogs use generic pictures or none at all, so it is really hard to track down specific components. A general knowledge of inductor packages and expected values is expected for this level of repair.

 

[exocomp]

R is the decimal place, universally agreed upon. Given the rough size, it has to be uH, I can't see a nH choke being in there.
First number is treated as such.
Decimal point, 1, no zeros, A.

I see if I only had a meter on hand to test with.

1227 as far as I can tell is unique to the manufacturer

I started looking on eBay for a parts only motherboard which I could perhaps use, idea being to just take out that component and use. I do see other ASUS motherboards with that R10A component but with a different number than 1227, perhaps that number is a part number specific to the board.

Other option is ASUS wants to have a technician look at it for $35 and then who knows how much they would quote for a repair themselves and don't know how much the shipping cost will be. They also told me they don't sell individual components. Bummer.

Surface mount electronics move too quickly for me to keep up with these days. Never really got beyond the hobby enthusiast level myself.

Same actually.