[TechAssist] Re: Toshiba CF3054J,TAC8950 still vert lintroublesafter C301 & C305 repl.]
- From: Kevin <kevinstv@xxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Mon, 09 Sep 2002 15:49:53 -0700
If you use a cap with, lets say a voltage of 4 times the original, you could
run into problems with the cap failing prematurly depending on the type of
circuit. The voltage should be the same or higher but not too much higher.
A capacitor likes to work close to its rated voltage. But, does the higher
voltage have anything to do with timing? I don't think so either. I have
noticed that 105 degrees C caps do have higher ESR values than 85 degrees C
ones.
Kevin Wilks
Kevin's TV and Video Repair
Penticton BC Canada
kevinstv@xxxxxxx
----- Original Message -----
From: Wayne Vanaman <Wayne@xxxxxxxxxxxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Monday, September 09, 2002 3:12 PM
Subject: [TechAssist] Re: Toshiba CF3054J,TAC8950 still vert lin
troublesafter C301 & C305 repl.]
>
> I don't believe the voltage rating has anything to do with discharge time.
> That is a factor of capacity, esr, and possibly dialectric absorbtion
> ("memory").
>
> Check for ANY not-black caps, I believe that most of the Toshibas, but not
> all, need three- c301, 305, 308, and sometimes the the 100uf or 220uf.
>
> Wayne Vanaman
> Omega Electronics
> 6904 W Fairfield Dr
> Pensacola, Fl. 32506-3310
>
> 850-456-5995 voice
> 850-458-6369 fax
>
> Mailto:Wayne@xxxxxxxxxxxxxxxxxxxxx
> WWW.PensacolaTVRepair.Com
>
>
> ----- Original Message -----
> From: "Ed Gaidies" <teltek2@xxxxxxxxxxxx>
> To: "TechAssist" <techassist@xxxxxxxxxxxxx>
> Sent: Monday, September 09, 2002 4:05 PM
> Subject: [TechAssist] Re: Toshiba CF3054J, TAC8950 still vert lin
> troublesafter C301 & C305 repl.]
>
>
> >
> > Phil......
> > Always....always.......C308......220ufd/35volts.
> > Due to the fact that these 2.2ufd/35 volts are timing
> capacitors.....should
> > never use higher than 50 volts.....discharge time is too great with a
> > 250volt cap. I have never tried to go higher for that reason,,,although
> you
> > may be lucky.
> > BTW...you may have to change the vertical O/P IC too.
> >
> > -Ed-
> > Tel-Tek Electronics
> > Midland, Ontario
> > Canada.
> >
> > teltek2@xxxxxxxxxxxx
> > teltek3@xxxxxxxxxxxx
> > teltek@xxxxxxx
> >
> > "Quality will be remembered....long after Price is forgotten"
> >
> >
> >
> > Phil Bader The above is the reply to your message dated 9/9/02 2:33
PM
> >
> > >
> > >
> > >
> > > 31" Toshiba TV CF3054J: Orig. symptom was very narrow vert. deflection
> > > and fold over.
> > > ESR'd C301 and C305, both 2.2/50V red electrolytics.Both very high,
> > > almost infinate ESR. Replaced both with 2.2/250v @105 deg. (all I
had).
> > > Increased vert. heigth but still narrow by 4 inches top and bottom
with
> > > a top fold over. These two caps always do it. I measured the caps
before
> > > install and are exactly 2.2 mfd. What else am I overlooking here?
> > > Phil Bader
> >
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