Author Topic: QFN Dead Bug  (Read 2095 times)

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Offline @rt

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QFN Dead Bug
« on: April 12, 2019, 06:28:23 am »
That was fun  |O
 
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Online capt bullshot

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Re: QFN Dead Bug
« Reply #1 on: April 12, 2019, 06:48:37 am »
Ouch
Safety devices hinder evolution
 

Offline OwO

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Re: QFN Dead Bug
« Reply #2 on: April 12, 2019, 07:20:34 am »
What's wrong with just getting a breakout board
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Offline Berni

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Re: QFN Dead Bug
« 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.
 

Offline harnon

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Re: QFN Dead Bug
« Reply #4 on: April 12, 2019, 07:44:24 am »
I've always wondered how to do star grounding.  :o
 

Offline @rt

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Re: QFN Dead Bug
« 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.
 

Online Psi

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Re: QFN Dead Bug
« Reply #6 on: April 12, 2019, 09:25:47 am »
Someone had to do it....

Greek letter 'Psi' (not Pounds per Square Inch)
 
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Re: QFN Dead Bug
« Reply #7 on: April 12, 2019, 09:41:17 am »
Double^h^h^h^h^h^hthousandfold ouch
Safety devices hinder evolution
 

Offline @rt

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Re: QFN Dead Bug
« 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.
 
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Offline JPortici

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Re: QFN Dead Bug
« Reply #9 on: April 12, 2019, 10:09:17 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)
 
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Offline @rt

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Re: QFN Dead Bug
« 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.
 

Offline @rt

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Re: QFN Dead Bug
« Reply #11 on: April 12, 2019, 12:00:27 pm »
The damn thing works! .. which is cool because it took hours.
 

Online Psi

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Re: QFN Dead Bug
« Reply #12 on: April 12, 2019, 12:01:12 pm »
The damn thing works! .. which is cool because it took hours.

Was that with or without a microscope?
Greek letter 'Psi' (not Pounds per Square Inch)
 

Offline @rt

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Re: QFN Dead Bug
« Reply #13 on: April 12, 2019, 12:29:58 pm »
I’m just a scumbag with a bifocal magnifying glass.
 

Offline @rt

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Re: QFN Dead Bug
« Reply #14 on: April 12, 2019, 12:30:45 pm »
from our good friends at Jaycar Electronics.
 

Offline jonovid

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Re: QFN Dead Bug
« Reply #15 on: April 12, 2019, 12:48:41 pm »
Someone had to do it....


:clap: top marks!
Hobby of evil genius      basic knowledge of electronics
 

Online Psi

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Re: QFN Dead Bug
« Reply #16 on: April 12, 2019, 01:02:24 pm »
Wasn't me, just someone had to post that old pic in this thread :)
Greek letter 'Psi' (not Pounds per Square Inch)
 

Online PA0PBZ

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Re: QFN Dead Bug
« Reply #17 on: April 12, 2019, 02:22:18 pm »
Wasn't me, just someone had to post that old pic in this thread :)

Now you made me post this:

Keyboard error: Press F1 to continue.
 

Offline Canis Dirus Leidy

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Re: QFN Dead Bug
« Reply #18 on: April 12, 2019, 03:36:47 pm »
 

Offline @rt

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Re: QFN Dead Bug
« 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.

 

Offline JPortici

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Re: QFN Dead Bug
« Reply #20 on: April 12, 2019, 06:08:12 pm »
Yeah, more tedious than difficult
 

Offline Berni

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Re: QFN Dead Bug
« Reply #21 on: April 12, 2019, 06:17:55 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.
 

Offline james_s

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Re: QFN Dead Bug
« 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.
 

Offline ElectronicSupersonic

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Re: QFN Dead Bug
« 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.
 

Offline Berni

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Re: QFN Dead Bug
« 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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