Author Topic: QFN Dead Bug (Read 6939 times)

@rt · « **on:** April 12, 2019, 06:28:23 am »

That was fun

capt bullshot · « **Reply #1 on:** April 12, 2019, 06:48:37 am »

OwO · « **Reply #2 on:** April 12, 2019, 07:20:34 am »

What's wrong with just getting a breakout board

Berni · « **Reply #3 on:** April 12, 2019, 07:42:50 am »

Yep i have done it before and it can get very annoying with the tiny pin pitch ones.

Sometimes you don't have a breakout board on hand but really want to test out a chip this moment.

harnon · « **Reply #4 on:** April 12, 2019, 07:44:24 am »

I've always wondered how to do star grounding.

@rt · « **Reply #5 on:** April 12, 2019, 09:22:40 am »

It’s an oddball. I’m not sure there is a breakout PCB for it.

Psi · « **Reply #6 on:** April 12, 2019, 09:25:47 am »

Someone had to do it....

capt bullshot · « **Reply #7 on:** April 12, 2019, 09:41:17 am »

Double^h^h^h^h^h^hthousandfold ouch

@rt · « **Reply #8 on:** April 12, 2019, 09:52:52 am »

Have seen. Interesting way to address faulty BGA process.

This one from 2 years ago still going strong.
It got a blob of potting compound shortly after this pic was taken.

JPortici · « **Reply #9 on:** April 12, 2019, 10:09:17 am »

Quote from: @rt on April 12, 2019, 09:22:40 am

It’s an oddball. I’m not sure there is a breakout PCB for it.

fucking sillabs. the guy who though and approved of this should be flayed.
(I assume it's sillab as i had to prototype a RF transceiver with that same package. And obviously the pads underneath carry essential signals)

@rt · « **Reply #10 on:** April 12, 2019, 10:52:58 am »

I don’t know what you call it, but even if breakout was available, I wouldn’t have waited the 1-2 weeks for it.

@rt · « **Reply #11 on:** April 12, 2019, 12:00:27 pm »

The damn thing works! .. which is cool because it took hours.

Psi · « **Reply #12 on:** April 12, 2019, 12:01:12 pm »

Quote from: @rt on April 12, 2019, 12:00:27 pm

The damn thing works! .. which is cool because it took hours.

Was that with or without a microscope?

@rt · « **Reply #13 on:** April 12, 2019, 12:29:58 pm »

I’m just a scumbag with a bifocal magnifying glass.

@rt · « **Reply #14 on:** April 12, 2019, 12:30:45 pm »

from our good friends at Jaycar Electronics.

jonovid · « **Reply #15 on:** April 12, 2019, 12:48:41 pm »

Quote from: Psi on April 12, 2019, 09:25:47 am

Someone had to do it....

top marks!

Psi · « **Reply #16 on:** April 12, 2019, 01:02:24 pm »

Wasn't me, just someone had to post that old pic in this thread

PA0PBZ · « **Reply #17 on:** April 12, 2019, 02:22:18 pm »

Quote from: Psi on April 12, 2019, 01:02:24 pm

Wasn't me, just someone had to post that old pic in this thread

Now you made me post this:

Canis Dirus Leidy · « **Reply #18 on:** April 12, 2019, 03:36:47 pm »

Japanese don't surrender!

@rt · « **Reply #19 on:** April 12, 2019, 04:43:39 pm »

To be honest, with the right tools, I don’t see any difficulty in that last one at all, except maybe that NAND or whatever it is.

JPortici · « **Reply #20 on:** April 12, 2019, 06:08:12 pm »

Yeah, more tedious than difficult

Berni · « **Reply #21 on:** April 12, 2019, 06:17:55 pm »

Quote from: Canis Dirus Leidy on April 12, 2019, 03:36:47 pm

Japanese don't surrender!

Im guessing thats Elm Chans work. One of the few people that builds circuits like that and somehow makes it look so neat and tidy at the same time.

james_s · « **Reply #22 on:** April 13, 2019, 12:29:27 am »

Elm Chan has astonished me for years, his work is absolutely amazing, I've built a lot of stuff by hand but I can't touch his level of neatness.

ElectronicSupersonic · « **Reply #23 on:** April 14, 2019, 03:50:59 am »

Although far less impressive, here are few pics of my attempt at recovering EMMC from Samsung tablet.

Berni · « **Reply #24 on:** April 14, 2019, 07:26:25 am »

Ah yes i already recognize its a eMMC from that damn evil footprint.

Difficult to even solder on a PCB. So many tiny pitch balls, yet 90% of them are just NC. Why not just use a damn QFN if you only need 10 pins.


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Author Topic: QFN Dead Bug (Read 6939 times)

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