[TechAssist] Re: Capacitor Question
- From: gulftech@xxxxxxxx
- To: techassist@xxxxxxxxxxxxx
- Date: Sat, 19 Jul 2003 17:36:08 -0500
Thanks, Jerry, for that explanation. Whatever material used for the
electrolyte, we have all (or should have) seen the results of the
leakage. It seems to me that s/m caps are the worst. I just replaced 49
s/m caps on an Hitachi TV. Mitsubishi is well known for e-cap leakage.
Most of the Sony camcorder problems can be traced to e-cap failure.
Don't know what the rest of you do, but I usually replace s/m caps with
radial-lead caps. Not just for convenience, but reliability. The only
problem usually is size. There are many suppliers who stock miniature
caps. I use very few used parts, but I save chassis with min caps.
Regards,
Ken Smith
Gulf Technical Services
3034 Gulf Breeze Parkway
Gulf Breeze, FL 32563
850-934-8324 (Voice) 850-932-0819 (Fax)
On Sat, 19 Jul 2003 16:59:19 -0400 "J Silverman"
<greentron@xxxxxxxxxxxxxxxx> writes:
> The electrolyte is conductive. Thats why they call it electrolyte.
> Modern
> cap electrolyte is not corrosive all by itself. It is ethylene
> glycol,
> water, and an ammonium salt, and and a little secret proprietory
> stuff that
> each manufacturer uses to say that their cap is better than the
> competitions. When you stick two pieces of metal in an electrolyte
> and put a
> voltage across them, this make an electroplating cell. The metal
> leaves one
> piece and goes to the other piece. While the metal ions are on their
> way
> from one place to another they are highly reactive and may combine
> with
> other stuff encountered on the way to form a material known as
> crud. The
> crud may be corrosive or conductive or both. The crud piles up under
> chip
> caps, resistors, transistors, and ICs and forms marvelous new
> circuits that
> do the most unexpected things. The customer does not appreciate this
> miracle, even though you tell him that although his camcorder wont
> take
> pictures anymore it will cook hot dogs now.
> The "fish" odor is from the ammonium salt content of the
> electrolyte. If I
> ever get to Australia I will take a dump and get the answer to your
> last
> question.
> Jerry Silverman
> Greentron Inc
> 4 Newland Ave
> Greenville SC 29609
> 864 232 3889
> Fax 271 2080
> mailto:greentron@xxxxxxx
> ----- Original Message -----
> From: <MDileo0000@xxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Saturday, July 19, 2003 4:11 PM
> Subject: [TechAssist] Re: Capacitor Question
>
>
> > Does the electrolyte change? If not then it apparently doesn't eat
> up the
> > capacitor foil. Do new caps smell like fish if you open them? Do
> toilets
> flush
> > lefthanded in Australia?
> >
> >
> > Dominic DiLeo
> > Atlantic TV
> > Freeport, Maine
> >
> > ZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZ
> >
> > Have to give him credit for trying. Now if we see a camcorder with
> > capacitors leaking electrolyte we just give it back to the
> customer. If
> you
> > dont replace them all it will just keep coming back over and over.
> Also
> the
> > electrolyte causes traces to be eaten up and thru holes to be
> eaten up.
> The
> > electrolyte goes under chip parts and ICs or even into the pcb
> material
> > itself and and causes all sorts of mischief. Live and learn! I
> prefer to
> > learn from other peoples mistakes but sometimes I just have to
> make my
> own.
> > Jerry Silverman
> > Greentron Inc
> > 4 Newland Ave
> > Greenville SC 29609
> > 864 232 3889
> > Fax 271 2080
> >
>
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