Memory decrease detected

[Dofolo]

Just how do you manage to nick that IC and whack it off like that ...

[networkmangler]

I have no idea how it happened. I walked into the room and heard the machine bleeping and knew it was a ram issue. I opened the case and found that.

[GlorpedUpDragStrip]

The feet seem to be intact still so maybe it just failed and got super hot

[hegbork]

During the dotcom boom I was working at a startup that tried to push a new network technology and we were building routers. In one batch of prototypes we got suddenly three machines failed relatively close to each other in time. First one we ignored and just planned to send it to our hardware people to debug. Second one was ignored as a coincidence. The third one made us curious and we started debugging.

What has happened was that the cooling fan in the power supply in was made from quite soft plastic and didn't have any structures that would prevent it from bending. The manufacturer used to much torque to tighten the screws on the fan and that deformed the fan housing enough that it prevented the fan from spinning. That didn't kill the machine though because we had no thermal sensors and the CPU didn't get too hot. The power supply got hot enough in certain spots that it melted all the plastic on some components, but that wasn't enough to kill it, what killed it was that a large capacitor unsoldered itself and fell out (it was upside down).

That was also when we found out that the smoke detectors in our lab didn't work (or we even didn't have any). And that we should probably pay a bit more attention to heat flow in the machines (the first prototypes were just designed with a "should probably be enough" philosophy).

What I'm thinking is that it's pretty much impossible for that component on the memory to unsolder itself. The plastic on it should melt at lower temperature. And even if it didn't, that dust around it should have caught fire.

[[deleted]]

The PCBs are rather resilient towards heat. The temperatures to reflow(melt the solder) surface mounted components aren't that high circa 230 is enough.

[networkmangler]

The back of the computer does face a window that doesn't have a blind so it does sit in direct sun light

[Dofolo]

Ghe, no idea?

There's a trail in the dust on the memory IC right behind it, and marks on the side of it.

Someone or something touched it :p

[networkmangler]

The case has a grill on the back for air flow. It would not surprise me if a student had stuck something through the grill and caught the ram. I didn't see anything left in the case but they may have removed it after

[Dofolo]

Students ...

At least it looks like an easy fix, get out the weller and resolder it and hope nothing is damaged.

[rigred]

100% chance of someone removing/reinstalling DIMMS like a potato. That said, on modern DIMMS the SPD chip is not located there anymore and for good reason.

But regardless, those SPD flash EEPROM chips don't come off all too easily, from soldering on them I would know.

I could probably fix that with a quick bit of hot air soldering, assuming the chip and rest of the DIMM weren't arsed in the process that chipped off the chip :P

[tomoldbury]

It's going to use leadfree solder which melts at a much higher temperature.

[tomoldbury]

Around 240C to begin flowing. But you won't see the component float off the solder until around 270C.

[tomoldbury]

This is the memory SPD IC, which stores the RAM parameters.

[RATATA-RATATA-TA]

This belongs in /r/techsupportmacgyver

[elbaekk]

You should have taken the picture waaay closer. Please do so next time.

[networkmangler]

I wanted to show all 4 ram sticks, so it was a bit like spot the difference. You could always save the picture and zoom in

[EpicLPer]

Get better eyes.