BGA mem chip resoldering. Xtreme enough?

About a month ago i killed my R9800Pro with monkey wrench (tried to use it when epoxied heatsinks and cracked up one memory chip). After that i went for vacation and this week, when i returned i started to search a solution for repairing it.
And here goes the miraclous resurrection of R9800Pro: cracked chip was resoldered with another 2.8 ns Samsung from my old Triplex Ti4600.

Next project - to solder the same 2.8 chips on to R9500 and beat 22k on it:) Stay tuned!

http://alt.modlabs.net/bga-chip-resolder.jpg

NICE! how did you solder them? how many solder points do bga chips have?

wow, thats impressive

hmmm, this makes me think about my broken ti 4600 i got for 50 dollars..

heres my problem, see pic below. i think someone told me its bad memory or somthing, i really want it to work.. :(

http://www.angelfire.com/amiga2/wtf_..._messed_up.JPG

could be the gpu as well...

can you solder a new gpu on?

Holy §§§§ man, that's hardcore. Well done.

144 solderballs with 0.8mm pitch on 12x12mm ... i assume you used industrial equipment..

God thats crazy. Xtreme thing of the month.

thats extremely impressive.

did you use this baking solder stuff?

I'm guessing liquid solder and hot air.

Well all i'm intrested in is what equipment you did use ;)
But very nice job there :D

it should work if you just put a tiny drop of a conductive liquid as as on it and then carefull stick the chip on it and then glue it on so it doesnt move.

all cirquit mounted devices are baked on those cards. The cards go trough a sort of oven a few times on different temperatures. The different temperatures are used so that the other components don't come loose on the pcb. For this willing to work you need to use solder with different compositions so that the melting point is different.

I recently saw this in action on a video where they where producing DDR memory sticks.

so you can resolder it by heating up the chip to a certain level. or put the whole card in a very acurate oven :)

On the video they also said that the chips can whistand this process for 2-3 times.

http://www.seattlerobotics.org/encod...6/oven_art.htm

Quote:

---

Originally posted by saaya
http://www.seattlerobotics.org/encod...6/oven_art.htm

---

Very interesting. Nice link.

Phalanx28

I know they're incredibly expensive, but wouldn't it be possibly to buy 2ns or 2.2ns chips and solder them on?:slobber:

if you have the right equipment yes. but if you buy only 8 pieces they are really expensive! the price of the memory is like 60% of the card i think

Use 2.2ns chips from a geforce fx 5900 on a radeon 9800 :slobber: 500mhz mem clocks :slobber:

If someone could point me to a place to buy that ram, I would consider doing this.. saying I had the proper tools to remove the current chips and put the new ones on.. and they weren't going to cost an arm and a leg 8-/

That makes me think of something else - Take some mushkin sticks of ram and put 2.2ns on their PCB... hehe 8-)

video memory = cl3 :/

start with some cheap cards, and try that first.

while I was in China, I visited a few of the soltek workshops, where they acutually fix dead motherboards!...

the most impressive thing was probably the BGA resoldering station, should have seen how easily it desoldered NB and SB!!!
the machine would grip on the chip tru vaccum and heat the BGA pad up...

It was acutally pretty cheap to get it done as well, costed like 10 bux..

The chip was resoldered using liquid solder and hot air as Illicit Tweakin already said. We`ve also seen north and south bridge resoldering here, so its also possible if you have the needed parts.

2 STEvil
heh you guessed right (about mushkin). Were searchin for the spare memory module rite now. But that would be an experiment.

If any of you guys have a dead card with 2.8ns bga chips, that would be really great if you shared it for the experiment. :)

One chip on our FX5900 unsoldered from high temps. We couldn`t see dis by eye, though when we fully unsoldered the chip and put it back, the card started working without artefacts again.

BTW, Guess who will give a spare 9500 for memory resoldering? :)