BGA mem chip resoldering. Xtreme enough?

**ALT-F13** · 08-31-2003 08:35 AM

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!

**saaya** · 08-31-2003 08:39 AM

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

**faruquehabib** · 08-31-2003 08:46 AM

wow, thats impressive

**taco** · 08-31-2003 09:04 AM

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..

**saaya** · 08-31-2003 09:22 AM

could be the gpu as well...

**~~Sick0fthelies~~** · 08-31-2003 09:24 AM

can you solder a new gpu on?

**KnightElite** · 08-31-2003 09:34 AM

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

**W1zzard** · 08-31-2003 09:39 AM

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

**afireinside** · 08-31-2003 09:49 AM

God thats crazy. Xtreme thing of the month.

**JCviggen** · 08-31-2003 10:35 AM

thats extremely impressive.

**saaya** · 08-31-2003 10:49 AM

did you use this baking solder stuff?

**Illicit Tweakin** · 08-31-2003 11:16 AM

I'm guessing liquid solder and hot air.

**Penti** · 08-31-2003 11:17 AM

Well all i'm intrested in is what equipment you did use

But very nice job there

**saaya** · 08-31-2003 11:31 AM

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.

**ns_ripper** · 08-31-2003 11:41 AM

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.

**saaya** · 08-31-2003 11:54 AM

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

**Phalanx28** · 08-31-2003 12:32 PM

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

Very interesting. Nice link.

Phalanx28

**Thaddy** · 08-31-2003 01:48 PM

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

**saaya** · 08-31-2003 01:58 PM

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

**berkut** · 08-31-2003 02:23 PM

Use 2.2ns chips from a geforce fx 5900 on a radeon 9800

500mhz mem clocks

**STEvil** · 08-31-2003 07:32 PM

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-)

**saaya** · 08-31-2003 07:39 PM

video memory = cl3 :/

**Kunaak** · 08-31-2003 09:16 PM

start with some cheap cards, and try that first.

**Ragnarok** · 08-31-2003 10:53 PM

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..

**La1kr0diZ** · 08-31-2003 11:37 PM

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?

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