I said i'll never try reballing...

[xboxhaxorz]

Re: I said i'll never try reballing...

Authorized Distributors
USA
XModdz
(http://kingboflux.com/)


So is this genuine advice or just advertising?

well advice because kingbo is truly the best
whos to say you will buy it from xmoddz anywho

most fluxes stop working after 200c kingbo is still bubbling at 240c

amtech is also a great flux BUT the cost is much higher so i say just use kingbo

[Agent24]

Re: I said i'll never try reballing...

The chip must be heated 4 times: to remove it, to clean it, to reball it, and to reflow it. Whether you are heating too much or for too long at each step is a different question.


If you are lifting pads, it may be that you did not heat enough when you removed the chip and it loosened them enough that when you started wicking you finished them off. It could also be that you overheated them instead.

With a DIY system this is quite possible, if it is not calibrated properly, or you are getting uneven heating.

Make sure you your temperatures are accurate and uniform as possible and you are following the proper reflow profile.


When cleaning the pads, you shouldn't need to "scrub" the pads with the wick. Just lay it down, apply heat, then remove. Move to the next area and repeat. Once you get the hang of it you might be able to start moving it around, but I think it's risky.

Overheating and physical stress are the enemy of all pads and traces! Make sure you have the area clean (lots of paste flux), a nice big clean wick, and a good iron.

I don't think you really need the solder bulb at all.

[Th3_uN1Qu3]

Re: I said i'll never try reballing...

I haven't lifted pads with the solder wick, but was pretty close to pulling a few on one of my scrap boards. Use lots of flux and be gentle, you have to feel the wick just glide over the pads. If you feel it rubs or "grabs" the pads, then you either have not enough flux or not enough heat from your iron. This is why pads lift. Edit: You're definitely not using enough flux if the wick scrubs off the solder mask.

I've yet to attempt my first start-to-finish BGA swap, but the supplies have started arriving and i'll get to work soon. In a week tops i'll be able to come with more "hands-on" advice.

[ravenns]

Re: I said i'll never try reballing...

I am a newbee reballer too, I need an advice about cleaning pads on the board, and about aligning the chip in place after reballing. I get all of the 2 steps right, but in the end I get non functional Mobo or graphic card.
Firstly I built my own reballing machine which is consisted of hot air station above, and a grill below. I managed to do the clean lift, but I don't know if the chip is "healty" after all of those heating.
I usualy do like this:
1. Preheating below to a 150*C, then I apply above heat to 230*C I pick up the chip (this is the first heating of the chip)
2. Cleaning the chip (the second heating of the chip)
3. Heating the chip to melt the balls (third heating of the chip)
4. Aligning the chip with the markings on the board and heating (fourth heating of the chip)
So is it possible that in any of those heating steps the chip is burned?

Also, my problem is when cleaning the pads on the board (I use solder bulb and gently melting residues of solder with that bulb), and afterward use copper wick, and no matter how gently I go with the wick, I always rip off some of the pads on the board, but on the chip I manage to do a nice and clean and shiny pads.
I've seen many videos on YT about cleaning the pads on board. Some use cotton swabs while still hot, some use a piece of silicon to scrub the exces solder.
Can I use just the bulb method instead, and leave the wick?
Also, when using the wick I scrub the insulating warnish between two pads...
Also about aligning the chip?
Any idea?

[JonathanAnon]

Re: I said i'll never try reballing...

I had a few HP Pavilions (GPU) and playstations come in with the same stupid ball grid array issues, but I'm reluctant to get involved in the process... I mean if they come from the factory and this happens to them after a couple of years what chance do you have with trying to work something at home...

It would be impossible to give any sort of guarantee when, in my opinion, the devices have a congenital defect that you cannot rectify... well, aside from trying to crap in extra heatsinks or fans to stop the chip from detaching itself..

Having said that, I did a reflow of a PS3 for a friend with a 15 euro heatgun, using Gilksy's tutorials on youtube.... And I was more surprised than anybody else when it worked..

[Agent24]

Re: I said i'll never try reballing...

stay away from amtech for 2 reasons there are too many fakes and if you get the real thing its quite expensive

kingbo flux is the king of fluxes i say
it works extremely well search google

Authorized Distributors
USA
XModdz
(http://kingboflux.com/)


So is this genuine advice or just advertising?

[xboxhaxorz]

Re: I said i'll never try reballing...

if you get the chip off and clean you will need to do bga site clean i recommend this video
http://www.youtube.com/watch?v=s38vQxXv0GE

[xboxhaxorz]

Re: I said i'll never try reballing...

I know about fake flux. That's all they sell here. And yes, i would appreciate a link to the real thing.

Did some more practice today on scrap boards. Another two clean lifts. An Intel NB off the board i'd pulled the SB off earlier, and a nVidia MCP.

One more thing to watch out for: Always remove the red epoxy thoroughly, or you WILL break pads/traces when you lift the chip, if there's even the tiniest bit of that stuff holding onto the board.

stay away from amtech for 2 reasons there are too many fakes and if you get the real thing its quite expensive

kingbo flux is the king of fluxes i say
it works extremely well search google

[Th3_uN1Qu3]

Re: I said i'll never try reballing...

Tonight another reflow success story with my new toy. An Acer Aspire 5520G. I said no more Acer, but since it was no obligation, i accepted it. It was just going to be parted out if i couldn't fix it, so i gave it a shot and it worked. That's good, means i'm getting paid tomorrow. Northbridge was at fault on this one. Someone else tried to reflow it previously, and not only did he do an amateur job (it didn't work), but he didn't even bother to take the board out of the case (this model has a big access panel on the bottom), and partly melted the bottom of the case! It's gonna need some remodeling as the wireless card sits crooked.

This one looks like it's had its graphics card upgraded down the road, it says 8400M G 128MB on the case, but it has a 8600M GS 512MB inside. Looks like my acquaintance (hard to call this guy a friend, we just do business together) has gotten himself a pretty good work laptop.

Now i'm just waiting for my supplies to arrive from China, and i can get to the fun stuff.

[Th3_uN1Qu3]

Re: I said i'll never try reballing...

Looks like i've got myself another practice board.

As soon as i started pulling the Toshi apart i noticed obvious water damage - it was rusted in places! Ouch. I thought to myself, this ain't gonna work. And indeed, no display before reflow, no display after reflow.

Not a surprise, it looks so bad it was probably not even dried after the spill. AFAIK, the X1600 doesn't fail too often, so it was likely not broken in the first place.

[Th3_uN1Qu3]

Re: I said i'll never try reballing...

I know about fake flux. That's all they sell here. And yes, i would appreciate a link to the real thing.

Did some more practice today on scrap boards. Another two clean lifts. An Intel NB off the board i'd pulled the SB off earlier, and a nVidia MCP.

One more thing to watch out for: Always remove the red epoxy thoroughly, or you WILL break pads/traces when you lift the chip, if there's even the tiniest bit of that stuff holding onto the board.

[thesloc]

Re: I said i'll never try reballing...

I think one of the most important things is not to use fake tack flux...

Identifying fake AMTECH fluxes

If you want I can point you to a seller from China who I believe sells the legitimate thing albeit expired. I think they're fine, even after expiry.

Damn, I got ripped off.

[mockingbird]

Re: I said i'll never try reballing...

I think one of the most important things is not to use fake tack flux...

Identifying fake AMTECH fluxes

If you want I can point you to a seller from China who I believe sells the legitimate thing albeit expired. I think they're fine, even after expiry.

[Th3_uN1Qu3]

Re: I said i'll never try reballing...

I'll tell you soon enough. Another laptop arrived yesterday, this time it's a Toshiba. Again, diagnosed as bad NB/IGP. Turns on but doesn't light up the display at all. This one hasn't been worked on... supposedly. So, a reflow should at least make it display something, if the chip isn't shot.

Didn't have time to take a look inside yet, but i plan to take it apart tomorrow. First reflow using my new toy, coming soon.

[beggi90]

Re: I said i'll never try reballing...

What kind of bottom heater do you have?

I once tried this without one on a board with serious water damage to practice.
Guess I wasn't patient because I got bored and broke it off and killed the board even more

I've always wanted to do this the right way.

[Th3_uN1Qu3]

Yeah, i said so. But since i've got access to a bunch of free (and otherwise completely useless) laptop mainboards, thought i'd at least try my hand.

I've already ordered a BGA holder, and will check which stencils and ball diameters i need and order those too.

I already had a hot air station, and i managed to cobble together a bottom heater as well. I'll let your imagination go wild on this one, i'll tell you what it is later. All i can say is that with $5 worth of parts and an item that was lying around the room, sometimes used as a load resistor, i managed to build an usable bottom heater with power control. Not directly temp controlled yet, but till the other bits and bobs are gonna arrive from China... plenty of time.

Had some (really) dead boards to practice on. Results are encouraging. I used just the bottom heater tonight. I know you're not supposed to do that, but i just wanted to see whether the power is enough. It is.

I broke 2 nvidia card PCBs where the GPU got stuck in one corner, but i was actually trying to break them, and i'd already stripped most other parts from the cards anyway. But, i managed to get a completely clean lift of an Intel southbridge off a laptop board, at 225C. Cleaned all the solder from the chip and it's looking mint. Didn't bother to clean the board as well, but there's no lifted pads.

Tomorrow i'll do it properly and use the hot air gun on the top as well, and we shall see what happens.