laptop power fault: compaq presario C300EA

On Feb 19, 7:16 pm, bz <bz+...@ch100-5.chem.lsu.edu> wrote:

READ the article.http://en.wikipedia.org/wiki/Electrolytic_capacitor
I see no mistakes in it.

Then your illusion remains?

YOU are mistaken in your idea that electrolytics require a liquid
electrolyte.

It does.

IN the product, based on common industry terms (except those who
misunderstood the basic terms).

You will find that the essential action that produces an electrolytic is the
formation of the dielectric 'oxide' layer by the electrochemical action.

Which is nonsense as an argument, because any cap has to have a
dielectric component.

The distinction is to contrast one cap from another, to state
electrolytic because it was part of a manufacturing process is grossly
different from the normal industry term meaning electrolyte in the
finished product.

There is no point in arguing over a definition. One either accept the
commonly used definition and communicates with the world or insists on using
a different definition and is frequently misunderstood.

Yes, that is exactly what you should do (and accept you learned wrong
and are now educated).

 

On Feb 19, 7:16 pm, bz <bz+...@ch100-5.chem.lsu.edu> wrote:

emailaddr...@insightbb.com wrote in news:58f338af-65bf-42a4-b96e-
13470dae8...@g3g2000pre.googlegroups.com:





On Feb 19, 3:24 pm, bz <bz+...@ch100-5.chem.lsu.edu> wrote:
emailaddr...@insightbb.com wrote in news:d972e65d-ba83-4734-b5b7-
1b55bd8d4...@k19g2000prh.googlegroups.com:

Nope.  There are wet tantalum capacitors (that exist), but nobody use
s
....
The defining part that makes a capacitor an electrolytic is the presence
of
an electrolyte and the electro-chemical reaction that forms one of the
electrodes in 'very close proximity' to the metal electrode which can be
aluminum or tantalum or some other metal.

I used to make ceramic capacitors, so I am not really an expert on
electrolytic but you seem to have a mistaken idea as to what constitutes
an
'electrolytic'.
....

This is a good example of why we can't trust the encyclopedia that
anyone can edit.
The pictured caps aren't all electrolytic.  The first two from the
left are, and the rest are not (not 100% sure about the 2nd from the
end on the right side).

Electrolytic requires liquid electrolyte.

READ the article.http://en.wikipedia.org/wiki/Electrolytic_capacitor
I see no mistakes in it.

YOU are mistaken in your idea that electrolytics require a liquid
electrolyte.

You will find that the essential action that produces an electrolytic is the
formation of the dielectric 'oxide' layer by the electrochemical action.

There is no point in arguing over a definition. One either accept the
commonly used definition and communicates with the world or insists on using
a different definition and is frequently misunderstood.

Electrolyte: An electrolyte is a substance that will dissociate into ions in
solution and acquire the capacity to conduct electricity. The electrolytes
include sodium, potassium, chloride, calcium and phosphate. Informally,
called lytes. (The clue to the word electrolyte is in the lyte which comes
from the Greek lytos meaning that may be dissolved.)
[unquote]

If you look up "solid electrolyte" you will find that there are many
compounds that are considered electrolytes that contain no water and some are
even solids.

The SM chip left of C34 is probably an electrolytic, as are the two above the
marking C518 on the topside picture. On the bottom, the two chips I mentioned
before are just to the right and above the marking R678, another is above the
marking 07/03/17 on the heat pipe in your bottom picture.

But we have wandered far afield of helping the OP fix the problem with his  
laptop.

--
bz      73 de N5BZ k

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

bz+...@ch100-5.chem.lsu.edu   remove ch100-5 to avoid spam trap

Electrolytic is not about manufacturing as some mistakenly claim, it
is about the end result product.

If a cap has no liquid electrolyte in it, only ignorant people would
call that electrolytic in this day and age.

 

On Feb 19, 4:13 pm, Jerry Peters <je...@example.invalid> wrote:

In sci.electronics.repair emailaddr...@insightbb.com wrote:
On Feb 19, 10:57 am, "David" <some...@somewhere.com> wrote:
"Conor" <conor_tur...@hotmail.com> wrote in message

news:705dd7Fn2gvcU3@mid.individual.net...

In article
Xns9BB7430C6B726WQAHBGMXSZHVspamm...@130.39.198.139>, bz
says...

emailaddr...@insightbb.com wrote in
news:f8d97d59-d8dc-4594-8cd4-
8aef8e72f...@z10g2000prl.googlegroups.com:

http://img242.imageshack.us/img242/5075/topsmfz3.jpg

Two light tan, near left bottom corner, ~1/4 distance to
top edge and ~1/8
distance to right edge, with brown polarity bands,
opposite polarity, bands
out.

Without part numbers, it's meaningless.

I see at least 3 on the bottom view, one near the top
edge center and two
near the bottom edge center, partially hidden by a wiring
bundle.

Any cap over 10 uF will probably be electrolytic.

Wrong.

--
Conor

Actually most laptops use tantalum polarized capacitors
which are a type of electrolytic capacitor. What they avoid
are the more common aluminum electrolytic capacitors.
Ceramics are available in low voltages at quite high
capacitance values, but I have yet to see one over 10 uF.

David

Nope.  There are wet tantalum capacitors (that exist), but nobody uses
those in laptops.  In laptops you find surface mount dry tantalums
among other solid types, not electrolytic at all... again, this refers
to semi-modern laptops, not something really ancient.

A tatalum cap is a type of electrolytic. Specifically the dielectric
is formed by electro-chemical action.

        Jerry

Which is never what the majority calls an electrolytic cap. The
industry doesn't describe based on process, it differentiates based on
end result (except for ignorant marketing departments).

 

[Conor]

In article <cfeb4e9c-ed82-405a-8b9c-
f597f38440cb@k36g2000pri.googlegroups.com>, emailaddress@insightbb.com
says...

If a cap has no liquid electrolyte in it, only ignorant people would
call that electrolytic in this day and age.

DING. And it is because they have liquid electrolyte in them that makes
them completely unsuitable for a laptop environment.

--
Conor

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