Cleaning BGA pad ?

[bianchi77]

Everyone,

I got an issue with BGA pad covered with a layer of flux..
Does anyone know how to clean it ?

It's difficult for me reballing it, since the layer is blocking the ball..

Cheers

[Nick's Tvs]

Re: Cleaning BGA pad ?

MEK is great for cleaning up flux. Don't get it on your hands and don't let it sit on plastic for to long or it will eat away at it.

https://en.wikipedia.org/wiki/Butanone

[bianchi77]

Re: Cleaning BGA pad ?

MEK is great for cleaning up flux. Don't get it on your hands and don't let it sit on plastic for to long or it will eat away at it.

https://en.wikipedia.org/wiki/Butanone

acetone ? or methyl spirit ? turp ?

[kc8adu]

Re: Cleaning BGA pad ?

carb cleaner.

[stj]

Re: Cleaning BGA pad ?

you mean xylene??

[bianchi77]

Re: Cleaning BGA pad ?

carb cleaner.

it's very sticky like a thin layer of film, it's blocking me attaching a new pad...
I tried with spirit still doesn't work...

[diif]

Re: Cleaning BGA pad ?

attaching a new pad...

What do you mean ? have you ripped the pad from the board ?

[bianchi77]

Re: Cleaning BGA pad ?

What do you mean ? have you ripped the pad from the board ?

I mean new ball...the pads are ok..

[diif]

Re: Cleaning BGA pad ?

It's not the fact there is flux but the fact the pad isn't tinned that the ball isn't adhering.
You need to apply more flux and lead solder. Ensure all the pads are tinned then go over the area with solder wick. All the pads will then look shiny. I then use IPA on cotton buds to clean the bilk of the flux and clean room wipes after them to remove any fibres.
There are many videos on YouTube showing and explaining the process.

[bianchi77]

Re: Cleaning BGA pad ?

It's not the fact there is flux but the fact the pad isn't tinned that the ball isn't adhering.
You need to apply more flux and lead solder. Ensure all the pads are tinned then go over the area with solder wick. All the pads will then look shiny. I then use IPA on cotton buds to clean the bilk of the flux and clean room wipes after them to remove any fibres.
There are many videos on YouTube showing and explaining the process.

Ok, thanks for the suggestion, can you show me one example from youtube?

[diif]

Re: Cleaning BGA pad ?

Ok, thanks for the suggestion, can you show me one example from youtube?

No, it's not something I need to save.
There are many videos on there showing the bga rework process and cleaning the pads.
They all need to be shiny, rework with flux and solder until they all are. Then clean off with more flux and solder wick. Slight contact with the tip of the iron on a pad can help clean off the old crap but be very careful you don't want to rip it off.
Are you using a magnifier or microscope to help you see ?

[bianchi77]

Re: Cleaning BGA pad ?

No, it's not something I need to save.
There are many videos on there showing the bga rework process and cleaning the pads.
They all need to be shiny, rework with flux and solder until they all are. Then clean off with more flux and solder wick. Slight contact with the tip of the iron on a pad can help clean off the old crap but be very careful you don't want to rip it off.
Are you using a magnifier or microscope to help you see ?

Yes I'm using one..

[bianchi77]

Re: Cleaning BGA pad ?

How do you reckon for this one ?
https://www.youtube.com/watch?v=Z_XCM9NnMTI
I had done it and trying to put a new balls on them but can not stick

[diif]

Re: Cleaning BGA pad ?

How do you reckon for this one ?
https://www.youtube.com/watch?v=Z_XCM9NnMTI
I had done it and trying to put a new balls on them but can not stick

After watching it, are you understanding the process ?
Have you got all of the pads tinned and cleaned ?

[stj]

Re: Cleaning BGA pad ?

it could be fake flux.
https://www.youtube.com/watch?v=keJ1UwJfOtY