[TenTec] reballing a Dragon

[Wade Staggs]

*Really simplified version.... O.K.? Back in the good old days, electronic
components had wire leads. Now we have SMT or Surface Mount Technology. So
now on Microprocessors and other LSI or Large Scale Integration components.
There are tiny Pads or Lands on the bottom of the device. At the factory
these components have tiny Balls of solder on each lead, sometimes over 200
leads or pin connections could be on the device. In the new technology, the
Chip is placed on the board by a very fast and precise machine. The board
will then go through a multi-stage Oven which has a minimum of Heat-up,
Solder or Bond and then the cool down stage. Going through this oven on a
conveyor belt, the oven can be over 50 feet long. The circuit board has no
holes for component leads to pass through. I have repaired many video games
and other devices with a simple Paint Stripping Gun. It takes a light hand
and a handheld infrared thermometer is a must so that you don't cook the
board. It is very easy to do lots more harm to the device. Repairs of the
Xbox 360 have financed several of my Boat Anchor Restoration Projects. Try
goggling " The Red Ring of Death "*
*
73 from Wade/KJ4WS*

On Fri, Apr 1, 2016 at 1:04 PM, Tony <va3dwi at gmail.com> wrote:

> Showing my age here hi... hi. What's reballing? Thanks.
> 73, Tony VE3DWI.
>
> Sent from my BlackBerry 10 smartphone on the Bell network.
>   Original Message
> From: John Henry
> Sent: Thursday, March 31, 2016 13:03
> To: tentec at contesting.com
> Reply To: Discussion of Ten-Tec Equipment
> Subject: [TenTec] reballing a Dragon
>
> The problem wasn't always in reballing.
> There were problems in that the part sat on a shelf for 15 years, not in a
> clean room, and somewhere along the line got hit with ESD, or too hot one
> day, random circuits inside the chip failed, etc.
>
> I do however doubt that if 20 people tried to scavenge some dragonballs and
> had to replace it, well, maybe 4 in 20 would be happy at the end of the
> day, the other 16 would probably be buying a new rig. just my two cents.
> So many pitfalls along the way, the chips are at least 15 years old,
> storage, excessive heat, etc.
> Yield of TEN-TEC trying to do this using a couple of excellent BGA board
> houses to replace them was very low.
>
> 73, KI4JPL
> John Henry
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*Living one day at a time with Jesus as my Savior. But, still having Fun.*