wrote in news:71d7cea5-b073-45f9-9af3-
:

On Mar 20, 5:50*pm, bz wrote:
wrote in news:ab5c743f-169c-43a9-9431-53fdc5539063
@x41g2000hsb.googlegroups.com:

I have several circuit boards with surface mount HDMI that are bad .
Is there a easy and safe way to get these off
without wreaking the circuit board or frying the micro chips on the
board ? I'm really desprate. A new citcuit board
is $300.00 and I sell these receivers for about $350.00 and I pay
about $200.00 for the receivers. HELP!
Thanks, Ed

http://www.howardelectronics.com/chipquik/products.html
might help.

It will allow you to work at lower temperatures by replacing the solder
that is currently on the board with a low melting alloy.

Also, a hot air gun or an embossing tool along with using strategically
placed pieces of paper.

Build a 'dam' out of paper to protect the chips from the hot air.

Avoid setting the paper on fire and you should avoid damaging the chips.

I have used paper dams to allow me to remove a single SMT chip without
disturbing the components around it.

Good luck.

Thanks, you have been a great help. Ed

Oh, one other thing. Practice on some old PC boards that you don't need
anymore.

You can even salvage some parts while you are practicing.

You will find that, with practice, you can remove ALL the chips and
connectors (but not at the same time)
or just one chip.

With some solder braid to remove excess solder and with some flux and
solder paste, you should be able to put any
chip back onto a board, after it has been removed.

There are plenty of sites with good directions for soldering SMT chips.
Google for

'how to solder' SMT

You should find several good ones.







--
bz 73 de N5BZ k

please pardon my infinite ignorance, the set-of-things-I-do-not-know is an
infinite set.

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