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DIPSY in KITCHEN

A project log for DIPSY

DIY System on Chip based on FPGA, priced below 5 USD

Antti LukatsAntti Lukats 09/22/2015 at 20:246 Comments

This is really not that we should do in the kitchen, but if needed BGA's can be soldered easily with any heat source:

The magic is really in the flux. Any other BGA is easier than this one, to get this right you really need to have alignment precison below 200 microns. The BGA will self align itself but this tiny thing still has to be placed very accuratly.

We tried 3 times, first time the BGA was soldered perfectly but 180 degrees wrong, the second one was possible also perfect soldering, but I did drop it, and as it was still hot the BGA did come off.

The 3r one I did bake too short, so it did not stick, so she had to place it 4th time, and well the solder was OK and the board actually works.

All normal BGA packages are easy to handle - do not be afraid - 0.8 and 0.5 aligne itself much better than this small thingie..

Discussions

Antti Lukats wrote 09/23/2015 at 13:27 point

BGA TACKY GEL: IF8300, this the one we KNOW works like magic. There could be many others

http://www.interflux.com/en/rework-and-repair

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jaromir.sukuba wrote 09/22/2015 at 22:32 point

Impressive.

What solder paste/flux are you using? How do you apply it? I thought of reflowing parts in kitchen oven, but to me it looks like has slow rise of temperature - isn't there a risk of overheating of BGA part? Perhaps just my oven is too slow.

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Antti Lukats wrote 09/23/2015 at 11:17 point

I must make more explanation:

1) PRE HEAT to 285

2) place the PCB into preheated oven at some top location for so 1 min 10 sec maybe bit less OK too

3) DO NOT USE solder paste - any attempt to use solderpaste and it will not work

need to use BGA solder gel flux, this is the magic! most thickly solder gel you can get. need to apply very thin layer, this is visible in the last screen in the video.

This BGA gel flux makes really magic!

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jaromir.sukuba wrote 09/23/2015 at 11:58 point

Oh yes, now it makes sense, thanks. What particular BGA gel are you using?

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zakqwy wrote 09/22/2015 at 21:10 point

Very impressive. I've definitely had my fair share of '180 degrees wrong' incidents too... :-/

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Yann Guidon / YGDES wrote 09/22/2015 at 21:01 point

I envy your kids :-D

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