BGA reworking without special reballing equippment

[michaeld4500]

Hi great work. What type of flux and what is the solder you used ? Thanks

[LoMe64]

@michaeld4500

Thank you.

Concerning flux and solder, please read the older comments.

It's discussed more than once there.

Lothar

[trueblu8]

Awesome. Wow. I don't think I would have the patience to do this. Love the music too.

[LoMe64]

@trueblu8

Thank you for the kind words! Lothar

[YouStubid]

Hmmmm why did you cover it with foil when heating the first time but did not cover it when heating the chip back...? Is the foil even needed.

[LoMe64]

@YouStubid

I already answered this question in the comments.

It's not "needed", but prevents sensitive parts (plastic) from being damaged.

During the desoldering process more heat is applied for a longer time than during resoldering. Therefore protection is needed during desolderding rather than during resoldering.

[TheVessapaperimuumio]

@LoMe64

Yes, and there's also the fact that the foil is easier to use when desoldering than when resoldering. In the latter the added protection might not be worth risking misplacement of chip and stuff.

Impressive work. I know my SMD work so of course I knew this is possible. But only now I believe this can be practical.

[bastard3b]

Immerwieder eindrucksvoll ;) Aber waum so heiß? Bei mir klappt alles (auch ROHS) zwischen 220-230°

Aber habe was anderes vor:

Ich hab mir doch ne kleine CNC gebaut (video in meinen channel)

Da schnall ich mir einen Lötpasten Dispenser drauf der mir das macht ;)

Ich möchte mich ja auf CPUs, GPUs und Chipsätze "spezialisieren", und 400-800 balls drauf machen mit der hand..... ich weiß nicht ob das so toll ist ;)

[LoMe64]

@bastard3b

Hi!

Danke für die Blumen.

Die Temperatur ist deshalb so hoch, um die Dauer möglichst klein zu halten. Das ist dann von Vorteil, wenn sich in unmittelbarer Nähe des Chips empfindliche Bauteile befinden (z.B. aus Kunststoff). Meiner Erfahrung nach leiden die weniger bei kurzer Lötdauer mit höherer Temperatur.

Wenn der CNC Dispenser fertig ist UNBEDINGT ein Video einstellen! Interessiert mich sehr! Lothar

[devaniceCZ]

Motorola SP20?

[LoMe64]

@devaniceCZ

Sorry?

[dispatcher7007]

great vid... but the music absolutely sucks... thanks to the inventor of the mute-button:)

[touchwood1]

Thanks im going to try this soon

[videogameobsession]

Pretty impressive work. I'd never be able to be steady on micro points like that. I'd just buy a new cell phone. :P

[starbearer76]

what music is this? sounds like VNV Nation. thanks for showing this kind of soldering. i never thought you could rework a ball grid array chip like that.

[LoMe64]

@starbearer76

The misic is called "Out of time" by Ice Sun.

See ccmixter.org/people/IceSun

If you like it you probably also like Jorisma

see jamendo.com/de/artist/JORISMA

Try 'Mision 1' (RETRO2000)

Lothar

[bastard3b]

WOW!!!! Geil! Wollte auch schon ein reballing set holen, aber wenn es so auch geht......

Daumen hoch! Good Work! Well Done! Und danke für dieses Video!

[LoMe64]

@bastard3b

Danke für's Lob!

Hoffe, ich konnte Anregungen geben.

Viel Erfolg und berichte mal, wie's gelaufen ist. Lothar

[bastard3b]

@LoMe64 Bitte ;)

Soeben hab ich mein mainboard geschrottet bzw ein lötpad ging ab :(. Werd erst mal wieder in equipment investieren und dann mal aus spass etwas üben sonst geht wieder was kaputt :(

Ach ja, habe ein Vid gesehen wo n typ mit flussmittel die "balls" fixiert hat (also mit der pinzette). Wenn nur die balls besser verfügbar und nicht so teuer wären :(

[MLPFiM]

Fucknig retarted music.

[vseae15o]

Will this destroy the chip being taken off the phone at first?

[LoMe64]

@vseae15o

The intention is to reuse the original chip.

However, in rare cases the chip doesn't survive the process. So it might be handy to get a replacement chip and discard the old one.

Anyway: With a non-working device you have nothing to lose. Lothar

[yo6ial]

Heh... Few days ago I whose thinking about reballing and bga chips reworkings like "it ain't worth the effort."

Now I just might have to do this kind of stuff ;))

Thanks mate for sharing this. :)

[LoMe64]

@yo6ial

Thank you!

You're welcome.

 Lothar

[cowletable]

awesome! 

[WizardSool]

Sir, what is that vacuum like thing that you used to remove the IC?

is it vacuum?

[LoMe64]

@WizardSool

Hi!

Yes, it's vacuum. See the older comments for details.

Lothar

[cd4600]

Great vid, thanks!

[myno1fakeaccount]

haha a little solder ball was applied to each pad looooooool it must take forever especially if you have to do bigger reball

[xymox14]

i want to remove a charge port from a phone but it has plastic inside the metal casing of the port. How could i remove it without melting the plastic? I have and aoyue machine.

[LoMe64]

@xymox14

This is difficult.

In most cases there are bigger solderings for fixing the housing to the PCB. Remove these first with the soldering iron and some solder wick. Lifting the connector with a small knife may help.

Then roll a thick ball of molten solder over the pins in order to release them all together.

I would try to avoid hot air in this case.

Lothar

[mrconsignment]

Thanks for posting this video and following up the comments. I found all of my questions answered in the comments. Keep up the good work.

[benben20]

Hello! great job, I just wanted t know what is the size of the iron tip you are using? thank you in advance

[LoMe64]

@benben20

Thank's!

I don't know the exact size or label of the tip I used.

It was the smallest one I had. About 0.5mm I guess. Lothar

[KyleGP]

Can you use this method for Xbox 360 reballing?

[LoMe64]

@KyleGP

Yes, but: The Xbox360 chip is MUCH bigger. You will need a pre-heater.

See the other comments for details. Lothar

[bth11291]

what temp was your soldering iron at? thanks!

[LoMe64]

@bth11291

Well, 'normal' soldering temperature. Depends on the tip, the solder and so on.

My station is normally set to temperatures between 310 and 350 degrees celsius.

Experiment! The solder must flow, but the flux may not burn.

[hzuiel]

Is it possible to create the solder balls by putting solder paste on the chip and heating it?

[LoMe64]

@hzuiel

I tried that, but with dissappointing results. The balls are very small and you must remove leftover solder from between the balls. Also it's another big stress for the chip!

[sergiobanguer]

Yeah, i will use an eletric barbecue as preheater. Thank you for your advices!

[sergiobanguer2]

now, i am prepared to reball my nvidia g86 from my laptop!

[LoMe64]

@sergiobanguer2

I wish you all the best!

But keep in mind: A display chip is much more difficult to rework than a small chip from a mobile!

See the older comments for more information.

Lothar

[alexanderklekachev]

Thank you for the nice video! I'm trying to rework BGA-196-1.0 chip on my Wi-Fi adapter, with your technique. However I can't get constant shape of fresh solder balls on chip (and on PCB as well), it's varying a lot from pin to pin and ideal bally shape is difficult to get (I see it through same kind of low-mag microscope as you have). Do I need to worry about the shape a lot? If so, do you know any particular trick to make them all ball-like? Many thanks in advance!

[LoMe64]

@alexanderklekachev

Alexander,

thank you for your comment.

In order to get equal sized solder balls, it's essetial to use plenty flux.

I applied flux to the chip and also to the PCB before reballing.

Use a pointy tip and for each ball put a little more solder than needed on the iron.

Make sure, to remove the iron directly upwards from the chip. Not to one side or

slanted.

All the best Lothar

[alexanderklekachev]

@LoMe64,

thank you for immediate reply!

Yes, I also used a lot of flux before asking, my chip was actually floating in the thick flux layer :))

The idea to remove the iron tip perpendicularly to the chip gives good results!

Again, thanks a lot and good luck with your further experiments!

[LoMe64]

@alexanderklekachev

Sorry, answer text boxes at youtoube are a little small...

Another technique:

Put flux on the chip (plenty) and roll one fat solder ball (5mm or bigger) over the chip pins

using a bigger solder tip. This is easier, but will produce smaller balls.

[cutyhamchoi98]

quá pro

tỉ mỉ chính xác đến từng chi tiết, hàn quá pro

[12Pascal21]

Nice video !!!

However, i didn't change my mind on BGA 's:

I still hate them !!!!!

AWFUL reliability.

[TheChohr]

This was a really nice video. I have a couple of (trivial) questions though: what is the little tool that you used to grab hold of the chip once you had melted the solder? And when you were removing the old solder from the chip and motherboard, what was the strip that you were using to clean it?

[LoMe64]

@TheChohr

Thank you for your comment,

you will find all your questions answered in detail in the comments.

 Lothar

[intheshitter]

OMG I feel so bad for the little chip in that big vice!

[excriminal1]

all that work over a cheap ass phone.. hardly worth it

[LoMe64]

@excriminal1

Hello!

Demonstration!



[chosen1atWork]

i had asked a tech once before is this was possible and was told it wasnt..... but now i see he was wrong... got to find some boards to practice on so i can repair my 2 laptops...................

[LezuziuszHUN]

Hello! Im going to reball an older VGA. Im asking you about desoldering: I HAVE TO preheat the VGA before beginning the whole procedure? I dont have a preheater, just an Aoyue 852 A+ Can i make the so called "pre-heating" with it? If yes, how should I do that? (which temperature and airflow) After preheating what settings should i use for getting off the GPU?

[LoMe64]

@LezuziuszHUN

I would say, that preheating is alway a good choice.

Chips smaller than about 1.5cm square may be soldered without preheating.

Preheating is a MUST for chips with a housing bigger than 2cm square.

This is, what I think. You may find different statements. Lothar

[LezuziuszHUN]

@LoMe64 Thank you for your answer! You forgot to mention, which nozzle and what setting would you use, for desoldering a 2.5x2.5cm chip?

[LoMe64]

@LezuziuszHUN

As a rule of thumb I use a nozzle half the diameter of the chip size. For a 2.5x2.5 chip I'd use a nozzle of 1-1.5

The temperature settings would be the same as in the video. Airflow is not that critical. Use a middle value to experiment on some old devices. Practice! After some time you will have build up a feeling what settings to use.

DO NOT try to repair the important device without practice. It will be a sure fail. Get used to your tools first.

[LezuziuszHUN]

@LoMe64 Yeah, im practicing on some junk, so its not important to get succes at first! But i have about 4-5 old VGA which has problems, so i would like to repair them (doesnt matter if i fail, those are mine, and i cant use those anyway). I just dont know which temperature would destroy the GPU. Ive tryed to desolder an FX5200's GPU at 330 oC, but i failed. after that i made with 470, i got the GPU off easily. Im still going to get some experience on older ones, till i got the lowest temp setup.

[chosen1atWork]

@LezuziuszHUN you should remember that when the chips are assembled at the factory, most of them have a dab of glue under them to hold them in place... you can always go hotter if it doesnt come off... but you cannot go back to cooler once the chip is broken. The one BGA i have to do requires a heatgun to cover it... have fun

[outsideworld76]

Nice method, but how do you manage the size of the solder 'schmelzperle'?

[LoMe64]

@outsideworld76

Thank's!

The size ist generated by the combination of the size of the soldering pad and the surface tension of the molten solder. These two parameters limit the maximum size of the solder ball. The minimum size is given by the amount of solder available. So, if there is enough solder present on the soldering iron tip (as well as flux of course) all the solder balls tend to have almost the same size when using a invariant technique for placing them.

Lothar

[thebakersman12vids]

He did a pretty good job, but he should of used a microscope not only on the chip but on the board as well. Because there could have been damage to the PCB area where the chip is. A microscope would have helped see that. A microscope would help people who think the damage is to the IC chip on the phone when it just might be to the PCB area where the chip is installed. Thats the area they may need to repair.

[02015678]

@thebakersman12vids ：you should understand this video is from a Chinese. I realize that microscope or so can really make a improve, but you should realize that those equipment needs so much money and most workers cannot afford.For instance i am a student and have no money to buy such things,i have to learn these techniques.Hard work somehow can make a change too.

[02015678]

@thebakersman12vids ：you should understand this video is from a Chinese. I realize that microscope or so can really make a improve, but you should realize that those equipment needs so much money and most workers cannot afford.For instance i am a student and have no money to buy such things,i have to learn these techniques.Hard work somehow can make a change too.

[simontay1984]

I would've thought the chip would end up being fryed/melted in the process with 300*C heat.

[JimmyJoXS]

Amazing work, I've used a similar method soldering LGAs, well, i guess LGA is just BGA without the balls. Still, that is hard to the core.

[MajinGohanSSJ2]

nice practice

[CDMCSD2]

One thing I didn't appreciate was moving desoldering wick so fast on balls.

This can easily take one out, as I have done many times... :D

[cooldudeintown]

Thank you for the tutorial . I enjoyed seeing an alternative .

[calbo1954]

I was impressed with the technique. It shows a lot of possibilities for use with bios chip replacement etc. Thanks for the video

[thegenrl]

all for what a silly cell phone?

[LoMe64]

@thegenrl

No, the cellphone is just an example.

The video is about reballing - not repairing cheap cellphones.

Watch again and see. Lothar

[thegenrl]

@LoMe64 lothar dont get me wrong, i was only joking. this is excellent work. is this chip .4mm pitch? also where did you get that mini suction device? i am forced to use a tweezers because i dont have such a device.

[LoMe64]

@thegenrl

No worries.

Pitch could have been .4mm I didn't measure it.

The device is called 'Vacuum tweezers' and is usually available wher you get reworking stations.

Mine came with 3 different nozzles and was around $3 in a small shop in Bangkok. Lothar

[scompo]

This is very wrong. Experience or not it's not a reliable way to solder bgas.

[LoMe64]

@scompo

Did I say it's reliable?

It's fun and it's POSSIBLE. That's the point.

Lothar

[thebakersman12vids]

@scompo Correct me if Im wrong.

 I thought he did a pretty good job. The only thing is that he should of used a microscope.

[papadopou]

Hello!

Great video.I have a question for you:From your experience how much time and at which temperature do you need to desolder a graphics BGA IC from a laptop?(With the use of a preheater of course).

I have an Aoyue 852+ station and an Aoyue 853 preheater

[LoMe64]

@papadopou

I cannot give you exact values, but I expect it would take a similar or shorter time to desolder the chip.

Keep in mind: You will need a much bigger nozzle and of course a much higher airflow for a graphics BGA.

Have successs! And drop me a note about the result, please.

Thank's! Lothar

[papadopou]

@LoMe64

Thank you for your very fast answer!

I have tried to desolder BGA IC from motherboard with medium to bad results.I had to stick a screwdriver next to chip,preheat board at 200-250(at least) and use hot air at 90% and about 350 Celcius.Then litle by little try to lift chip up(while heating it from both sides as I say before).I also use a nozzle 35*35 mm while my chip is about 34*34 mm(It is a Nvidia chip). I finally made it but ruin some of board's tracks..

Any suggestions?

[LoMe64]

@papadopou

Very strange...

Did you check the temperatures of your reworking station with an external thermometer?

I had a cheap reworking station before and it turned out, it delivered 260° air when set to 350°!!

With the temperatures you described, the chip should come off pretty easy without dragging PCB pads. Lothar

[papadopou]

@LoMe64

Well as I said I have Aoyue 852+ which I quess is similar to the one you have..Maybe I have to preheat board for more time maybe 10 mins or is it too much?

[LoMe64]

@papadopou

The hot air device on my Aoyoue was set right, but the iron was far too cold.

Both can be adjusted within the base unit.

10-15 mins of pre-heating should be enough. Lothar

[papadopou]

@LoMe64

10-15 mins!!

I have never done that much preheating,maybe 5 mins tops..

Maybe that's the problem and I can't desolder it?

Thank you.

[ladams00]

music sucks

[siemensserbia]

and you are positioning chip with eye and bare hands or how?

[LoMe64]

@siemensserbia

Yes, by hand and if necessary with a magnifying glass.

There are positioning marks on the PCB. If not, make your own before removing the original chip.  Lothar

[siemensserbia]

@LoMe64 thanks for quick response,what heater do i need and what is ideal and maximum temperature for cpu on htc artemis?thanks in advance!

[LoMe64]

@siemensserbia

For maximum ratings please see the datasheet of the chip manufacturer.

Since by-hand reworking is not very precise at all, I usually stick to temperatures

of about 300-350 degrees Celsius. 300 for small chips, 350 (with preheater) for

bigger chips. This worked fine until now. Lothar

[Morbuto]

This is rather incredible to watch having just been hand soldering "simple" 10-pad CSP devices... I would recommend that anyone who intends to do this goes on ebay and buys a bunch of ready-made solder balls instead, they are cheap and make the process so much more reliable.

In my experience it is hard to get a consistent quantity of solder on each pad with this method, while I have so far had a 100% success rate using (hand-placed) solder balls.

[unrewritable]

what's the recommended temperature to desoldered a chip? for example to dissolder an xbox 360 GPU using a heatgun?

[LoMe64]

@unrewritable

HI!

Did you watch the video? You can see it there.

I don't recommend to use a heatgun! The temperature regulation is inaccurate.

[mrsteve1968]

Thanks for the great video very helpful but i have a newbie question, what is the name of the device you use to remove the chip from the board, looks like it has a suction cup on the end of it, still getting my feet wet in this hobbie, is there any type of hot-air rework station that you would recommend......

[LoMe64]

@mrsteve1968

Welcome to this interesting world.

Both of your questions have been already answered in the comments.

The device is called 'vacuum tweezers' and is available at Aoyue reworking station dealers. I also use an Aoyue 899 reworking station. Lothar

[SEVANAL]

wow really a great job

[BritishBlackOps]

Why do yu add soder to every connection i use soder paste and soder braid

[LoMe64]

@BritishBlackOps

Hi!

I did that too, but it doesn't lead to much better results.

Solder paste is not always available, so I decided to show the 'plain solder' version.

 Lothar

[dying2l]

this looks really difficult how did you practice?

[LoMe64]

@dying2l

38 years of soldering every electronic device I could lay my hands on ;-) Lothar

[jimjim1972]

You mean preheater below the board;

[LoMe64]

@jimjim1972

Exactly. The board is heated using infrared light from below.

Lothar

[chaceco]

So, we need SPECIAL equippment

[LoMe64]

@chaceco

Please read the posting!

You will need it, if you are going to reball big chips.

For the mobile phone in the video no preheater was used.

By the way: A kitchen cooking plate can serve well as a preheater, if used carefully. Lothar

[jimjim1972]

Fantastic job.

This mode makes the repairs graphics cards in laptop?

[LoMe64]

@jimjim1972

Thank's!

Short answer: Yes.

Long answer: Yes, but you will need most likely additional equipment such as a preheater. Lothar

[gr0bd4]

Wow absolutely nuts! Wouldn't the balls on the chip as well as on the board be round after reballing, preventing it from proper placement (because they might slip to a side and conect with wrong pin?)

What's your success ratio to failed reballs?

[LoMe64]

@gr0bd4

Yes, the placement is a little tricky. But with a little experience you 'feel' if the chip is in the right place. as you see in the video the chip places itself perfectly when the solder balls melt.

Success rate up to now: 93%

[LoMe64]

@chieffrankus

Thank you!

During resoldering the temperature is lower and it does take less time.

So there is no need to protect the other components.

The song is called "Out of time" by Ice Sun.

See ccmixter.org/people/IceSun Lothar

[abz2000123]

amazing!!!

never seen anything like it.

hand reballing

[belii076439]

вы накатили шарики без трафарета? великолепное умение. у меня не получается так - руки дрожат при такой мелкой работе)

[LoMe64]

@belii076439

Hi!

Sorry, my Russian is very bad. 2 years @ school and loooong time ago.

Thank you for your compliment. I also have shaky hands some time.

Coffee works for me - or a night sleeping.

Also you can try to roll a big drop of molten sloder over the pins instead of doing them one by one. It sometimes works. Try it.

Спасибо! Lothar

[tristan7zavier]

Hello, great video! Although this may be a dumb question, I have to ask. Can i use paste flux for these procedures? Is there more of an advantage to using liquid flux?

Thanks, Chris.

[LoMe64]

@tristan7zavier

Thank you!

It doesn't matter if you use paste or liquid flux.

I find liquid flux easier to handle. But that's just my opinion.

More important is: Make sure the flux you use is easy removeable. I use propyl alcohol and it washes away excess flux perfectly. Lothar

[MiodragCulum]

Thank's a lot! Can 300C temperature damage the chip? And, I understand that have to heat until chip "moves on the right palce". Right?

[LoMe64]

@MiodragCulum

Yes, 300C will damage the chip when applied too long. So solder as short as possible.

The chip will not move when it was already placed perfect. Therfore I use the little knife you see in the video for softly touching the chip and 'feel' if it floats.

[diesalweasel]

i there love the video amazeing couple of queston

1 will that tool your useing will it work on a laptop chip nvia graffic or any other video chip with out damage to it

2 will it put it back on safeley without damage

3 once a gain great video top marks best i seen in detail

[LoMe64]

@diesalweasel

Thank you for your comment.

Yes, it will work on bigger chips too. I already did that. But remember: You will need an infrared preheater for bigger chips. See older comments.

There is no guarantee the chip will not be damaged! But when doing this the chip is usually already broken anyway. Lothar

[iSeeTriangles]

Shame on you for making this look so easy! ;-)

I got three questions for you:

1.) As I suspected the liquid flux you were using is colophony, but what flux did you use for re-soldering? Is it some kind of "soldering honey" (Löthonig vom Conrad ;-))?

2.) Do you think balling chip and PCB will be enough for a modern GPU? The chip's solder balls look pretty big.

3.) What tin-to-lead mixture do you recommend?

TIA for your answers!

[LoMe64]

@iSeeTriangles

Hi and thank you!

Yes, the flux is colophony. But you may use any flux you prefer. Löthonig is fine, too.

No, I experienced problems when balling only the chip. The solder balls created by hand are smaller than professional applied solder balls. So it's necessary to place balls on the chip and the PCB as well.

Standard electonic hobby solder (containing lead). "Radiolot" in German. I think it contains 60% tin. Lothar

[RockManAU]

Amazing! Totally Amazing!

What stops the chip shorting pin to pin with all that solder under there?

Is there something that causes the chip to move to correct place?

Is there something that causes solder to stay on individual pins?

How do you check for correct chip placement after?

Sorry I am a noob at this if you couldn't tell!

Great Clip Thank You

[LoMe64]

@RockManAU

Thank you very much!

-Shorting the pins is prevented by the surface tension of the solder in presence of flux. It builds small balls by itself.

- Positioning: Again the urface tension

- The solder stays on the pins, because it's bonding to the metal and not to the plastic.

- I checked the alignment of the chip against a marking on the circuit board. The edge of the chip has to align to a printed "L" Lothar

[BlueMacGyver]

Nice work!!!

[kashpc]

Love the music

[LoMe64]

@jamaldjabou

Hi!

I'm very sorry. I can't help you with any of the requested information.

The only thing: The vacuum tweezers in the video come without any documentation, but with 3 different nozzles.

Cheers Lothar

[steve1979a]

nice work, but my problem is how do you know what chip to rework ?

[RealGamersTV]

Hey, whats that piece of equipment you had in your left hand, the one you used to remove the chip?

Thanks ^^

[LoMe64]

@RealGamersTV

It's called "vacuum tweezers" and you can get it, where you bought your reworking station.

[RealGamersTV]

@LoMe64 Thanks!!! I needed to know that =D

[RealGamersTV]

@LoMe64 How much did it cost you?

[LoMe64]

@RealGamersTV

Don't know. Bought it in my holidays in Bangkok. $2 or something...

[RealGamersTV]

@LoMe64 WOOOW thats cheap, a lot i see on the internet are 100s :(

[aeg12p]

Thanks, Can you upload the song? cant seem to find it on YT/google tbh ;(

[LoMe64]

@aeg12p

See ccmixter.org/people/IceSun

[aeg12p]

Whats the name of the song?

[LoMe64]

@aeg12p

Out of time

by Ice Sun

(mentioned at the end of the video)

[reply4reply]

yeah great work man, but in 2010 there are new equipments that make the whole thing easier but i like old school

[Thewestofestonia]

Very Excellent video!!! These are great skills you got! Keep it up! Now i try to learn it too and then do it with laptop chips. Now i reflow them but i need to learn reballing too!!!

[BulgarianBoy92]

u got skillz!

[danboynz]

Wow. I've never seen soldering that small done before. Excellent. I'm going to have to find a micro solderer online I think. Thanks for the demo.

[JimTonic79]

Good work! Everything seems to be easy, exept when you place the new balls. Any suggestions?

[LoMe64]

@JimTonic79

Thank's!

In fact placing the balls is the easiest part. When enough flux is available, the balls build a perfect shape almost by themselfs.

I also found, rolling a big drop of solder on the tip of the iron on chip and PCB also forms neat tin bumps on the pins and pads.

There is no need to place them one by one. Try it. You'll be surprised.

Apply plenty flux and it's a job of seconds. Lothar

[JimTonic79]

@LoMe64 What kind of flux do you use? On the page where I found your video it is written not to use liquid flux. I used to apply two types of flux. One is a liquid form, second seems like some kind of grease. But they are absolutely different from yours.

Thanks for your help!

Please keep up your good work and share more profitable videos like this one. :-)

[LoMe64]

@JimTonic79

I use colophony, which is a natural tree resin and hard as glass. I dissolve it in isoprophyl alcohol. You get the resin at a hobby store and the alcohol at a pharmacy.

But the exact type of flux does not matter, as long as it's suitable for electronic soldering. The advantage of colophony is: You are able to affect the viscosity by adding more or less alcohol. Lothar

[Lhybz]

Whats that wire called? The one you used in cleaning?

[LoMe64]

@Lhybz

It's called "solder wick". See the comments below. Lothar

[NikuR32]

Ich hätte eine frage woher bekomme ich so eine Pumpe her, also zum heruasziehen des BGA Chips??

danke

[LoMe64]

@NikuR32

Hi!

Die Pumpe und auch alles was zur Loetstation gehoert, bekommt man bei der Firma WilTec in Eschweiler. Einfach bei google nach 'aoyue' suchen.

[JimTonic79]

@LoMe64 Ich spreche auch deutsch, und hier unten habe ich gelesen dass du Aoyoue Heissluft Loetation benutzst. Welche? Ich habe jetzt eine 909-er gekauft, aber dort kann man die Temperatur nicht puenktlich einstellen, weil die hat keine digital Anzeige. Aber ich glaube mit etwas Erfahrung im Zukunft wird es gehen. Oder?

[LoMe64]

@JimTonic79

a lot of readers don't understand German, so I stick to english.

I think any of the Aoyue reworking stations are suitable. It's not necessary to set the temperature to a precise value. More important is the accuracy of the closed-loop control of the station so there is no big difference to the set temperature (what ever it is).

I measured my Aoyue 899+ and it holds the temperature very accurate. A cheap station I had before, differed about 50 degrees + - (!) very bad!

Lothar

[ukraliAkaunt]

он там не заёбся шарики то с проволочного припоя накатывать?

[LoMe64]

@ukraliAkaunt

Sorry, my Russian is very bad.

It's easy to create the balls with solder wire. After a few minutes of practice you can create very nice and equal balls. The pins on the chip are all the same size and so the balls build up in similar size too. Lothar

[AnArChYm]

Hi LoMe64,

Awesome video you did there. I would like to try this on my iphone 3G after my Marvell 88w8686 wifi/bluetooth chip is malfunctioned. I have a question about the heat gun you used, could you please state what was the model you used? And another question does heating the chip would eventually be damaged? And what does the flux actually do? Please keep in mind I am very new to soldering :)

[LoMe64]

@AnArChYm

Hi AnArChYm ,

You will find lots of information concerning the tools I used in the other comments.

I strongly recommend to you _not_ to try the reworking on your iPhone yourself. If you are complete new to soldering you will 100% ruin your phone. Sorry, but there is really no chance. Find someone experienced. Show him the video and ask for help. It looks easy in the video but it's the result of decades of soldering experience.

Lothar

[AnArChYm]

@LoMe64

Thanks for your advice...I have some mobiles which I can practise before. Maybe the only thing which is on my side is the fact that I know the iphone hardware and architecture since I do repair them

[unitedforhelp]

Hi LoMe64,

Awesome video you did there. I would like to try this on my iphone 3G after my Marvell 88w8686 wifi/bluetooth chip is malfunctioned. I have a question about the heat gun you used, could you please state what was the model you used? And another question does heating the chip would eventually be damaged? And what does the flux actually do? Please keep in mind I am very new to soldering :)

[gavincurtis]

Nice! :)

[TheBrotherKanker]

LOL - you're my idol!

[dino9232]

what was all the stuff you used? just want to learn something new..lol what was that cable?

[LoMe64]

@dino9232

Hi!

I'd really like to help you - if you only would be a little bit more precise...

Please read the other comments. I already described nearly all the details there. Lothar

[sandiegomarino]

beautiful , looks like heart surgery

[theamberco]

@LoMe64, Now that you ask when I get the PLC BGA machine in about a month I will make a reballing and upload a video.

[theamberco]

@LoMe,I tried once the chip moved and desaligned. I have Metcal and hakko irons and hot air with mechanical arm it was very hard to get solder from the iron onto the tiny contacts and the probability of getting shorts is high. Also I imagine some contacts might not have enough solder on them, some too much. The life expectancy should be lower. I am getting a PLC controlled BGA machine to do this right everytime I think is worth the money, US$ 2500.

[LoMe64]

@theamberco

Of course a professional machine will do the job faster and more reliable. But not everyone is willing to pay a lot of money for it.

Concerning soldering: Use plenty of flux when placinge the balls. Use little flux when resoldering the chip to the PCB. Using too much solder in the last step will cause the chip to swim away on the molten flux. Also reduce the air flow amount. Good luck!

Will we see a video of your BGA machine?

Thank's! Lothar

[theamberco]

how is the chip going to align with uneven solder all over?

[LoMe64]

@theamberco

You never tried this, did you?

The surface tension of the molten solder drags the chip to the PCB and the chip aligns itself. You can see this in the video just after the text quote "Watch the chip!".

A little tap with the scalpel does the rest. Try it yourself - it's fascinating to see. Lothar

[maniougn]

that's hardcore, definitely not for rookies.

[LoMe64]

@maniougn

:) Sort of. Thank's!