sci.electronics.repair Google Group

Re: Yet another bulging-capacitors replacement

2010-09-05T00:17:10Z

Assuming that you're talking a 'standard' SM rework station with hot air
pencil, and not a multi-thousand dollar fixed rework station, then the one I
recently purchased direct from China, was just 55 quid - about $85. Bit of
postage to add on of course, but at that sort of money, not too much
justification required, I would suggest ? Look on eBay for KADA 852D. Very

How best to eval heat risk from AC adaptors

2010-09-04T21:12:03Z

WHat P=VI values are safe to leave plugged in indefinitely (clock or phone)?
I still remember a 1970s Readers Digest on a fire from a 1950s
telephone adaptor..
- = -
Vasos Panagiotopoulos, Columbia'81+, Reagan, Mozart, Pindus, BioStrategist
[link] [link]

Re: Supergluing your fingers together

2010-09-04T20:57:50Z

isw wrote:
You put a drop of it on a bit of scrap plastic, and apply with a
toothpick--just like epoxy. If you use too much, the free surface
outgasses like mad and you wind up with white plastic snow all over
everything. There are 'low outgassing' PMMA formulations, but they're
only low by comparison.

Re: Yet another bulging-capacitors replacement

2010-09-04T20:22:17Z

On Sat, 4 Sep 2010 12:28:55 -0700 (PDT), whit3rd <whit...@gmail.com>
wrote:
<[link]>
The exact quote is:
A considerable increase in thermal effectiveness of a BGA
package can be obtained by using boards that are thermally
efficient, increasing the airflow, or providing thermal paths

Re: Yet another bulging-capacitors replacement

2010-09-04T19:28:55Z

Like Intel says, it's primary.
'Primary' does not mean the heatsink with the largest heat flux. It
means the FIRST heatsink, the one that all designers start with.
BGA packages have quite a lot of thermal conductivity through those
soldered-down feet, it's not something to be ignored.
In related news, 'prime rib' is a rib roast with the rib #1 included.

Re: Yet another bulging-capacitors replacement

2010-09-04T17:19:27Z

On Sat, 4 Sep 2010 09:44:11 +0100, "Arfa Daily"
There are about 100 assorted BGA packages, most of which do not
require a heat sink. You see them on video cards, cell phones, glue
chips, game machines, and most commonly on memory cards. There is NO
WAY your large BGA package, which probably has a big FPGA burning 200

HOT ACTRESS

2010-09-04T15:33:12Z

ASTHASINGAL IN A BATHROOM
[link]
SNEHA HOT SEX PHOTOS
[link]
ARTHICHABRIA BEAUTIFUL PHOTOS
[link]
ANUSHKA UNBELIVABLE PHOTOS

Re: Plasma TV Foggy area

2010-09-04T12:57:54Z

If the screen protector was damaged by some solvent it would be easy to
tell using a little oblique lighting

Re: Plasma TV Foggy area

2010-09-04T09:51:01Z

Lets not get ahead of ourselves - do we know for sure it's really a plasma
and not an LCD? My customers often confuse the two.
If not damage to anti-glare coating which has been suggested, it does sound
more like an LCD type problem to me.
Mark Z.

Re: Yet another bulging-capacitors replacement

2010-09-04T08:44:11Z

OK. So here's the thing. The articles that you linked to are very
interesting, and at least one says that "the pcb is the primary heatsink in
the case of BGAs". Given that is true, as it was Intel I think that said it,
is this true for all BGAs ? If it is, then what is the point of fixing an
elaborate heatsinking system to the *tops* of the BGAs, and force cooling

Re: Weird stuff -- update -- (was Electronic Kenmore refrigerator not working, what does this sign mean)

2010-09-04T04:10:59Z

Vapor lock. Likely a little light on freon and the pump shutting off
gets a high head pressure and can't push up to clear it.
Likely in the off position, it will leak pass a gasket and it will start.
That is my suspect. Might be that way only when hot. e.g. just running.
Might work in the shop all winter if cold out there - lightly running and

Re: Supergluing your fingers together

2010-09-04T03:50:36Z

In article <e9a18692kkr82i2c0vu3dd6oij583 5k...@4ax.com>,
Some newer formulations can be brushed on; they don't go off as fast,
and it's a lot easier to get the joint properly aligned than it used to
be.
Also, some formulations will work fine with things like paper or
cardboard, too.
Isaac

Re: Supergluing your fingers together

2010-09-04T03:47:27Z

In article <i5q87b$5i...@news.eternal-sep tember.org>,
Easy; you just smear it on with your finger 8^}
Isaac

Re: Weird stuff -- update -- (was Electronic Kenmore refrigerator not working, what does this sign mean)

2010-09-04T03:32:47Z

Back in the late 70's I worked for Tandy repair and most of the trouble
with their equipment was caused by cold solder joints. The connections
made with plated through holes on the circuit board were always suspect.
TDD

Re: Weird stuff -- update -- (was Electronic Kenmore refrigeratornotworking, what does this sign mean)

2010-09-04T03:07:51Z

Some cases put pressure on one side of the ribbon connector. The
modification extended it outside of the case. I repaired a lot of early
computers, too.