Empathy List Archives

S

SAIDJACK@aol.com

Thu, Jul 26, 2007 6:51 PM

In a message dated 7/26/2007 01:28:55 Pacific Daylight Time,
magnus@rubidium.dyndns.org writes:

sy cooling flange. On another board we glued a nut to the top of the BGA
and hanged 50-70 kg of it and while the board was clearly bent the BGA was
still firmly hooked to it. Now that's the difference between a few um of

gold

too much or not.

There are other cases where the gold-plating is not an issue.

This has been covered in public sources, so a dig around would give some
indication.

Cheers,
Magnus

Hi Magnus,

I've had a board with what the manufacturer called "black pad" syndrom: the
BGA literally popped off by just bending the PCB sufficiently. The solder
joint was useless.

Is this caused by the problem you described?

Also, what do you think is a better process: gold-flash, or gold-immersion?

bye,
Said

************************************** Get a sneak peek of the all-new AOL at
http://discover.aol.com/memed/aolcom30tour

In a message dated 7/26/2007 01:28:55 Pacific Daylight Time, magnus@rubidium.dyndns.org writes: >sy cooling flange. On another board we glued a nut to the top of the BGA >and hanged 50-70 kg of it and while the board was clearly bent the BGA was >still firmly hooked to it. Now that's the difference between a few um of gold >too much or not. >There are other cases where the gold-plating is not an issue. >This has been covered in public sources, so a dig around would give some >indication. >Cheers, >Magnus Hi Magnus, I've had a board with what the manufacturer called "black pad" syndrom: the BGA literally popped off by just bending the PCB sufficiently. The solder joint was useless. Is this caused by the problem you described? Also, what do you think is a better process: gold-flash, or gold-immersion? bye, Said ************************************** Get a sneak peek of the all-new AOL at http://discover.aol.com/memed/aolcom30tour

BG

Björn Gabrielsson

Thu, Jul 26, 2007 8:23 PM

Hi Said,

Magnus might be busy until after the weekend.

After fixing my Rb - Thanks!!! - and collecting a few antennas, Magnus
headed for the wilderness with a car full of beer and music festival
stuff.

btw,

Is anyone running a FE-5608A 19"-rubidium? The main internal parts are a
5MHz FE-2204A VCXO, and the FE-5607E rubidium package.

--

Björn

On Thu, July 26, 2007 20:51, SAIDJACK@aol.com said:

Hi Magnus,

I've had a board with what the manufacturer called "black pad" syndrom:
the
BGA literally popped off by just bending the PCB sufficiently. The solder
joint was useless.

Is this caused by the problem you described?

Also, what do you think is a better process: gold-flash, or
gold-immersion?

bye,
Said

************************************** Get a sneak peek of the all-new AOL
at
http://discover.aol.com/memed/aolcom30tour

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Hi Said, Magnus might be busy until after the weekend. After fixing my Rb - Thanks!!! - and collecting a few antennas, Magnus headed for the wilderness with a car full of beer and music festival stuff. btw, Is anyone running a FE-5608A 19"-rubidium? The main internal parts are a 5MHz FE-2204A VCXO, and the FE-5607E rubidium package. -- Björn On Thu, July 26, 2007 20:51, SAIDJACK@aol.com said: > Hi Magnus, > > I've had a board with what the manufacturer called "black pad" syndrom: > the > BGA literally popped off by just bending the PCB sufficiently. The solder > joint was useless. > > Is this caused by the problem you described? > > Also, what do you think is a better process: gold-flash, or > gold-immersion? > > bye, > Said > > > > ************************************** Get a sneak peek of the all-new AOL > at > http://discover.aol.com/memed/aolcom30tour > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. >

MD

Magnus Danielson

Mon, Jul 30, 2007 8:51 PM

From: SAIDJACK@aol.com
Subject: Re: [time-nuts] HP 5370B low frequency modulation
Date: Thu, 26 Jul 2007 14:51:27 EDT
Message-ID: d6b.b2db71f.33da472f@aol.com

Said,

Hi Magnus,

I've had a board with what the manufacturer called "black pad" syndrom: the
BGA literally popped off by just bending the PCB sufficiently. The solder
joint was useless.

Is this caused by the problem you described?

It is the only reason I know if you use a propper soldering profile while
soldering the BGA.

Also, what do you think is a better process: gold-flash, or gold-immersion?

No preference. The important thing is the relative amount of gold, and that
relates to the thickness of gold. A good process on gold-plating is crutial
regardless of method.

Cheers,
Magnus

From: SAIDJACK@aol.com Subject: Re: [time-nuts] HP 5370B low frequency modulation Date: Thu, 26 Jul 2007 14:51:27 EDT Message-ID: <d6b.b2db71f.33da472f@aol.com> Said, > Hi Magnus, > > I've had a board with what the manufacturer called "black pad" syndrom: the > BGA literally popped off by just bending the PCB sufficiently. The solder > joint was useless. > > Is this caused by the problem you described? It is the only reason I know if you use a propper soldering profile while soldering the BGA. > Also, what do you think is a better process: gold-flash, or gold-immersion? No preference. The important thing is the relative amount of gold, and that relates to the thickness of gold. A good process on gold-plating is crutial regardless of method. Cheers, Magnus

MD

Magnus Danielson

Mon, Jul 30, 2007 8:57 PM

From: Björn_Gabrielsson bg@lysator.liu.se
Subject: Re: [time-nuts] HP 5370B low frequency modulation
Date: Thu, 26 Jul 2007 22:23:09 +0200 (CEST)
Message-ID: 62287.87.227.52.225.1185481389.squirrel@webmail.lysator.liu.se

Björn,

Magnus might be busy until after the weekend.

Indeed I was.

After fixing my Rb - Thanks!!! - and collecting a few antennas, Magnus
headed for the wilderness with a car full of beer and music festival
stuff.

Indeed. I am now at my friends place relaxing after the festival and just
hanging around.

Fixing the Rb was reeealy a nice thing. It took some creativity as the ebayed
spare part was not a perfect match. Some creative rewiring made it lock and
stay stable. So cool. Björn's house is such a friendly place to be, so it is
worth doing a 400 km trip (200 km each way).

btw,

Is anyone running a FE-5608A 19"-rubidium? The main internal parts are a
5MHz FE-2204A VCXO, and the FE-5607E rubidium package.

I think I saw someone on the list recently...

Cheers,
Magnus

From: Björn_Gabrielsson <bg@lysator.liu.se> Subject: Re: [time-nuts] HP 5370B low frequency modulation Date: Thu, 26 Jul 2007 22:23:09 +0200 (CEST) Message-ID: <62287.87.227.52.225.1185481389.squirrel@webmail.lysator.liu.se> Björn, > Magnus might be busy until after the weekend. Indeed I was. > After fixing my Rb - Thanks!!! - and collecting a few antennas, Magnus > headed for the wilderness with a car full of beer and music festival > stuff. Indeed. I am now at my friends place relaxing after the festival and just hanging around. Fixing the Rb was reeealy a nice thing. It took some creativity as the ebayed spare part was not a perfect match. Some creative rewiring made it lock and stay stable. So cool. Björn's house is such a friendly place to be, so it is worth doing a 400 km trip (200 km each way). > btw, > > Is anyone running a FE-5608A 19"-rubidium? The main internal parts are a > 5MHz FE-2204A VCXO, and the FE-5607E rubidium package. I think I saw someone on the list recently... Cheers, Magnus

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Re: [time-nuts] HP 5370B low frequency modulation