First Steps - Intel Edison Repair

RE: First Steps - Intel Edison Repair

mcb1 — Thu, 23 Feb 2017 22:17:25 GMT

Thanks everyone.

[mention:7d5ee4caf55f4ccaa8b711eb508ecedd:e9ed411860ed4f2ba0265705b8793d05]

It doesn't appear that there is a connection to the underlying layers, but since the voltage was only on for a second, I don't think heat was the killer.

I didn't explain that in each step the voltage was adjusted then applied (briefly) so there would have been very little heat build-up during the testing phase.

They are nice machine but hard to justify the cost unless you are doing a lot or repairs.

In our case we had some very expensive boards that either required replacing or fixing, and this was the only proper option going forward.

Like it or not SMD and the packaging is here to stay ....

[mention:b0bc65b9ecdc4307bd967592f00e340a:e9ed411860ed4f2ba0265705b8793d05]

After seeing peoples comments about the component 'pulling' itself into place, I'm not sure why there is a need to be so exact.

It could be that BGA devices need to be placed correctly ... I don't know.

Having said that the accuracy of alignment is in the 100ths of a millimetre.

mark

RE: First Steps - Intel Edison Repair

DAB — Thu, 23 Feb 2017 19:26:53 GMT

Great post Mark,

I am curious, did you check the discrete components after you removed the chip?

Sometimes a fail can also take out some of the auxiliary devices, which might contribute to your second fail.

Just a thought,

DAB

RE: First Steps - Intel Edison Repair

shabaz — Thu, 23 Feb 2017 17:45:08 GMT

That's a really nice tool. I saw it at a trade event a while back, I loved the optical alignment method!

RE: First Steps - Intel Edison Repair

clem57 — Thu, 23 Feb 2017 16:00:48 GMT

A well written blog on a little known process. Thanks [mention:8fb233e8974445138ef0af2b63b49f94:e9ed411860ed4f2ba0265705b8793d05]. I got a good chuckle reading this.

An application of liquid flux and another cooking should sort it out, but the reality was it cleaned it up, but didn't move it.
In the end some careful heating with a very fine tip soldering iron made it look perfect.

The old skills are needed even with the expensive tools/toys.[View:/resized-image/__size/16x16/__key/commentfiles/f7d226abd59f475c9d224a79e3f0ec07-e21054d2-449d-4248-b366-843fba249ac0/contentimage_5F00_3890.png:16:16]

RE: First Steps - Intel Edison Repair

jw0752 — Thu, 23 Feb 2017 15:00:41 GMT

Hi Mark,

Thanks for the great explanation of your project to repair the board. It was fun to see how the fancy machine was used too.

John

RE: First Steps - Intel Edison Repair

rachaelp — Thu, 23 Feb 2017 10:46:22 GMT

Another excellent blog post! I seriously want one of those rework stations, it looks amazing!!!

Back to your toasting switcher....

You mentioned that it didn't solder down right as there was too much paste and no vias underneath it to allow the excess to wick away..... Could it be they forgot to bolt down the thermal pad of the IC to the planes underneath? I believe these devices require you to add multiple vias from the pad underneath to planes in the board to take the heat away. This is a tiny part with integrated switches so it's doing all the work and will get hot. I expect as you increase the voltage it's generating more heat which it can't dissipate because the board isn't giving a good thermal path. They even called the pad THPAD on the schematics, the clue being in the name....

Best Regards,

Rachael

RE: First Steps - Intel Edison Repair

COMPACT — Thu, 23 Feb 2017 09:39:25 GMT

That PDR is the big sister to mine.

I love your Pieco Paste Press too!