Delidding disaster

[Soulkeeper]

Busted SMD off 3870
After having done one of these with success and relative ease previously, I guess I got too carried away and didn't take my time.

I tried to solder it back on, but it's too small and there is also some damage that was done to the resistor which makes resoldering unlikely to fix it

I didn't even bother trying to use it while missing a component like this.
Keychain decoration I guess ...

 

[KingFatty]

There has to be a way to solder that, maybe hold it down with a toothpick and blow focused hot air with a special air heater thingy? Or maybe use some kind of funky-shaped metal tip that would spread heat to all the bumps and get them all to go?

Heck maybe a super sharp soldering iron could hit each bump. Do you have a dremel? Can you grind down the tip of a soldering iron really sharp? Then, without putting the busted piece back on, just re-melt each bump using the super sharp soldering tip. If there is missing solder, add some more. then you have nice fresh bumps there.

Find the tallest bump, and then reposition the busted piece, and melt that. Heck there has to be a way to do it. If it's damaged so much, maybe it's worth ordering a new one and while waiting for delivery, you could practice on some other electronics by busting the pieces off and soldering them back on? Maybe someone else has better experience/advice, I'm just speculating and it hurts to think this would become a keychain argh!

 

[Smoove910]

I definitely wouldn't 'grind the tip of a soldering iron really sharp'... the tip is made of tin, grinding it down will remove the material which allows you to solder.

I think your only hope would be to get some solder wick and remove the residual solder that is currently on the pads. Once it is smooth, try to line up the LCC (leadless chip carrier) back with the pads and tack one of the corners. To me it appears like it's damaged, so you may have to flip it upside down so you have terminations to solder the pads to. If that doesn't work, your only hope (unless you try powering it up without the chip) is to find a replacement. Good luck on that since there are no markings on it. Most important to remember, HEAT, NOT PRESSURE ALLOWS FOR SUCCESSFUL REPAIRS!

Also, you may want to repair the one directly below it since it looks like it reached reflow temp while you were delidding it.

By the way, I did rework and repair for over 7 years for Micron Custom Manufacturing Services (MCMS) before it was purchased by Plexus.corp. Hit me up if you have any other questions.

 

[p_monks33]

Good luck man, that made my stomach turn to think about how it feels to mess something so expensive up. I ruined a GTX 680 on launch day putting it in my PC with my wedding ring on, got it in and running good, reached past it with the case open while the PC was powered on, trying to adjust a water cooling line and , ZAP!! Caught the PCB of the card with my gold ring and fried it. Its a sickening feeling. Again good luck man.

 

[Idontcare]

Busted SMD off 3870
After having done one of these with success and relative ease previously, I guess I got too carried away and didn't take my time.

I tried to solder it back on, but it's too small and there is also some damage that was done to the resistor which makes resoldering unlikely to fix it

I didn't even bother trying to use it while missing a component like this.
Keychain decoration I guess ...

Aren't those just decoupling capacitors? If they are gone then your dynamic capacitance won't have as much ballast, just means things will whipsaw more than before, but the circuits themselves ought to function just fine.

If you are really intent on putting it back on there then I recommend you just get some electrically conductive epoxy (its like $10 on amazon) and use a toothpick + magnifying glass to put the tiniest of spots of the epoxy on the exposed leads on the PCB side and then with tweezers carefully rest the chip back onto the leads.

If you push it down to seat it then do so gently, the electrical contact will be good enough from the epoxy, and the chip isn't coming off either at that point.

 

[Soulkeeper]

that's a good idea, it just might work

To be honest I have no idea what their function is.
Would be great if I could find that, I guess the SMD caps usually have a color code and there appears to be 3 different shades of brown.

Something Like this

looking on other sites it appears to be: series 0508 4 element multilayer ceramic chip capacitor aray
2mmx1mm
3 different companies sale them in reels ...
i'd have to guess the capacitance ie: 10pF

 

[GPz1100]

Ouch,... What cpu was that?

Why is an amd cpu getting delidded?

 

[Soulkeeper]

Few Of These Should do the trick

 

[AdamK47]

I seriously hope IB-E comes with a soldered heat spreader.

 

[sunilx]

Ignorant question but what advantage is there to delidding a CPU?

 

[Xpage]

Ignorant question but what advantage is there to delidding a CPU?

direct contact of cooler to die, thus the potential for better cooling, allows for cooler temps or likely more of an overclock.

Also bragging rights

 

[wsaenotsock]

Why is an amd cpu getting delidded?

I was curious as well

 

[Soulkeeper]

I was curious as well

When I delidded the first one there were no other people on google image searches that had done it to a llano.
I was curious mostly what the llano die looked like, but an extra 3-5c cooler operation is enough for me.
Delidded the second one because I had already bent/adjusted my heatsink to ride lower and didn't want to undo that.

I buy hardware just to screw with all the settings/overclocking/modding ...
for some reason it brings me joy

 

[RU482]

Ignorant question but what advantage is there to delidding a CPU?

Any Ivy Bridge CPU has some wild temperature swings, most likely related to the mediocre heat dispersion method employed (from Intel) via their lidded case on the CPU

 

[moonbogg]

Whats a 3870?

 

[Rvenger]

I think he means A8-3870k, which has TIM b/w the die and heatspreader.

 

[Joseph F]

I believe he's referring to an AMD A8-3870. (Llano)

Oops, Rvenger beat me to it.

 

[Red Hawk]

Good luck man, that made my stomach turn to think about how it feels to mess something so expensive up. I ruined a GTX 680 on launch day putting it in my PC with my wedding ring on, got it in and running good, reached past it with the case open while the PC was powered on, trying to adjust a water cooling line and , ZAP!! Caught the PCB of the card with my gold ring and fried it. Its a sickening feeling. Again good luck man.

That is horrible.

 

[Idontcare]

that's a good idea, it just might work

To be honest I have no idea what their function is.
Would be great if I could find that, I guess the SMD caps usually have a color code and there appears to be 3 different shades of brown.

Something Like this

looking on other sites it appears to be: series 0508 4 element multilayer ceramic chip capacitor aray
2mmx1mm
3 different companies sale them in reels ...
i'd have to guess the capacitance ie: 10pF

Yeah they are just decoupling capacitors then. If you don't re-affix the capacitor then it should run just fine at stock but it probably won't hit the same OC's because the signal:noise ratio is now compromised. Things like vdroop will be worse than before, and the whipsaws will be worse, lifespan would be reduced but not enough that you'd ever notice.

Ignorant question but what advantage is there to delidding a CPU?

Lowers the operating temperatures which in turn lowers power-consumption as well as enabling lower voltage (or in turn higher clockspeeds).

You can read through this thread for an example of that.

When I delidded the first one there were no other people on google image searches that had done it to a llano.
I was curious mostly what the llano die looked like, but an extra 3-5c cooler operation is enough for me.
Delidded the second one because I had already bent/adjusted my heatsink to ride lower and didn't want to undo that.

I buy hardware just to screw with all the settings/overclocking/modding ...
for some reason it brings me joy

The same for me and my GTX460. I didn't find anyone delidding them, at least none that took the time to document it at the time, but I had an extra one and I figured why not try and see what would happen.

Now I've got this FX-8350 and no one has attempted to delid them but most seem to expect them to be soldered on. But if 32nm llano is not soldered, makes me thing 32nm FX-8350 is not soldered either. Packaging techniques tend to be harmonized across all products within a given process node...so it stands to reason. :hmm:

 

[BonzaiDuck]

IDontCare and others might know how wide that bead of black adhesive that affixes the processor cap, and prospective modders can take a little more care with the razorblade when de-lidding.

Restoring a tiny part like the one shown by OP is a new threshold (to me) in extreme-enthusiast actions. I'd personally be more inclined to give it up, and buy another processor. Call me a "woosie," but neither my eyes, my hands nor my tools are good enough to make such an effort successful.

 

[pablo87]

that's a good idea, it just might work

To be honest I have no idea what their function is.
Would be great if I could find that, I guess the SMD caps usually have a color code and there appears to be 3 different shades of brown.

Something Like this

looking on other sites it appears to be: series 0508 4 element multilayer ceramic chip capacitor aray
2mmx1mm
3 different companies sale them in reels ...
i'd have to guess the capacitance ie: 10pF

If you can find a small local smd shop, they're equipped to fix stuff like that. Might have the part too.

 

[Sheep221]

not sure why they returned to using IHS after socket A and PGA370, they worked well without it

 

[VirtualLarry]

I think that there may be a chance it would work without it, but the idea for the conductive epoxy is a good one too. Good luck man. Sorry to see a decent CPU get "injured".

I have an A6-3670K myself. I don't see high temps, but I don't have mine overclocked anymore. I tried overclocking it, and it seemed to work, but the quality of the audio over the HDMI output seemed to suffer. It didn't seem quite "pure", like there was jitter in the signal.

 

[NTMBK]

not sure why they returned to using IHS after socket A and PGA370, they worked well without it

I thought there were lots of horror stories about chipped dies when people mounted their heat sink badly?

 

[andy2000]

As others have said, those are just decoupling capacitors, and (assuming you didn't damage the circuit board) it will work fine without one of them. I wouldn't try to reattach it because it is obviously chipped, and it could short out. I've seen chipped ceramic capacitors short before (often after hours of use) and the results aren't pretty.

If you do anything, I would try to remove as much of the remains as you can to avoid any chances of a short. If you're good with a soldering iron, I would remove what's left of the cap and then clean the pads with solder wick. If you're not, then leave it alone.