> "tronic" <swmori
...@comcast.net> wrote in message
> news:aadbe3f6-0b49-49c1-9395-3fc3b3aed403@p33g2000vbn.googlegroups.com...
> On Nov 4, 10:05 pm, "Mark Zacharias" <mark_zachar...@sbclobal.net>
> wrote:
> > "tronic" <swmori...@comcast.net> wrote in message
> >news:ba311467-308c-4441-818b-694d4b0afc11@a21g2000yqc.googlegroups.com...
> > >I need a schematic or good advice. I tried replacing some of the caps.
> > > c541 a 100uf and c578 a 47uf . i dont know what part of the curcuit
> > > these belong too, but they didnt look bad and they didnt fix the
> > > problem.I tried to use a heat gun on the curcuit. i guess the next
> > > step is to replace ic 551 the la78045. has anyone seen this before so
> > > i am not buying unneeded parts?
> > Foldover isn't the IC - there's one or more caps you missed.
> > Mark Z.
> >mark Z
> >i replaced all caps in the 500 series curcuit
> >what i see on the top of the screen is "retrace lines" maybe about 2or
> >3 inches
> >but the picture is ok
> >so i think foldover might be the wrong term
> What you are describing is caused by the "boost capacitor" usually 100uF at
> 35 volts and located physically near the vertical output IC.
> You can go to bdent.com, register if necessary and get a PDF of your
> vertical IC. Using that, you can tell which pin the boost cap is associated
> with.
> This is important - when the boost cap is bad the vertical IC will usually
> run HOT and may fail soon if the situation is not corrected.
> Mark Z.- Hide quoted text -
> - Show quoted text -
fix it so i tried a 100uf and wualla it fixed it.
|
