Electronics Forum: clean under bga (Page 1 of 132)

bga reflow in water clean solder

Electronics Forum | Wed Apr 28 22:35:32 EDT 2004 | davef

We can clean the blank out of LARGE BGA. [Cleaning small BGA is a whoooole nuther issue.] But before we get into that, what's the problem and its breadth? Why are you getting poor wetting? What's the story on the components, board, process materia

bga reflow in water clean solder

Electronics Forum | Tue Apr 27 08:14:59 EDT 2004 | iqbal

Is anybody doing BGA soldering water clean solder. If yes how you are ensure cleaness. We have boards with Four BGA and 2000 chip and ICs.We are processing with no clean solder but we are getting bad wetting so now we are planning to switch to water

Crystalized Flux under BGA

Electronics Forum | Tue Aug 03 18:11:21 EDT 2004 | davef

Improper washing of water soluable flux residues can be a major contributor to flux residues remaining on the board surface. ;-O That you appear to be only complaining about the pathetic state of the ability of your washer to clean under BGA, it may

bga warp

Electronics Forum | Wed Sep 11 23:20:44 EDT 2002 | scottefiske

Profiles are absolutely the first course of action to validate. A few additional questions would be: * Moisture can cause warping as well, verify the manufacturers recommended handling procedures were followed. * Where is the suspect BGA located

bga warp

Electronics Forum | Wed Sep 11 16:57:04 EDT 2002 | bigwop

I've seen this problem caused by the cool down. > On a 7 zone oven I made a profile to peak at zone > 5 to give some semblance of control to the cool > down. The component can develope a big delta T, > because of the difference of materials Che

Crystalized Flux under BGA

Electronics Forum | Wed Aug 04 16:09:48 EDT 2004 | Dreamsniper

Hi, Thanks for your reply. I run 2 boards, using the same paste, thermal profile and the same method of aqueous cleaning, 1st is a Topline test board with topline BGA (BGA 272 with 1.27 Pitch) and the 2nd is our product PCB with our BGA from Motoro

Crystalized Flux under BGA

Electronics Forum | Fri Aug 06 15:32:03 EDT 2004 | Shean Dalton

Thanks for providing the pictures. We evaluated what we could see and have the following idea's. 1) Because of different thermal charatoristics between the topline and your product, your Motorola BGA solder joints may have experienced a higher refl

Crystalized Flux under BGA

Electronics Forum | Wed Aug 11 07:20:33 EDT 2004 | gregoryyork

HASL Fluids are generally not RA based fluxes. They are generally fluxes based on hydrochloric acid or hydrobromic acid or a mixture of the two, plus some very strong wetting agents that are very hygroscopic. Doesn't the residue of hydrochloric go wh

Crystalized Flux under BGA

Electronics Forum | Tue Aug 10 15:28:54 EDT 2004 | Shean Dalton

Because the HASL process most deal with bare metals, HASL flux residues are generally more active than solder paste residues. Typically a Rosin Active (RA) flux is used in the HASL process. These flux residues should be removed from the bare board

Crystalized Flux under BGA

Electronics Forum | Wed Aug 04 00:17:41 EDT 2004 | Shean Dalton

Additionally, increases in temperature can increase the water's rate of reaction with the flux. Sometimes, only a 5 degree change can make the cleaning difference. If the flux inconsistently presents itself, then the likely cause is something in

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