[TechAssist] Re: Mitsubishi Projo Model VS4507\Shutdn problem

The set comes with both caps installed from factory.
And if they don't there is a service bulletin or something
similar which says you should piggy back the 22mf with
an extra 47mf. That's therefore ok so far, but I usually
found one of them bad...
You will certainly found lots of bad caps all over, you'd
better check ALL THE BOARDS for bad caps (either dry
and leaky ones) and bad joints,  otherwise you are
risking future problems. For instance, you will always
find a bunch of bad ones in the convergence board
along with damaged circuit board's traces, etc etc.
Near the vertical IC there is a 12v zener that frequently
goes leaky, and of course try not to miss any bad
caps around, beginning by the 100mf ones and put
a new LA7838 to prevent future headaches.
Special care around the onboard PIP, the bad caps there
are responsible for a number of wierd problems like rolling picture, etc.
Even the audio section has to be taken care of if you do not want
the set to bounce...
HTH  buena suerte, saludos
Jorge



At 02:04 p.m. 29/09/03 -0700, you wrote:
>I just checked the ps bd and there are quite a few bad caps.Iam going to 
>replace
>them and then go to the vert.ckt and check around there.If you have the
>manual,can you or maybe someone that does have it,check and see if C911 
>should be
>a 47 or a 22 mfd cap because on the component side,there is a 47 mfd and 
>then on
>the foil side,there is a 22mfd  that is bridged with the 47mfd.I can't 
>recall and
>if this 2 caps should be bridged to make up C911 or whether someone just 
>bridged
>the 22mfd instead of rmoving the one in front.
>Thanks
>Mando
>Birdie's TV & Electronics
>Casa  Grande, AZ
>
>
>al m wrote:
>
> > Look at all the boards Mando. You'll find lots of bad caps.
> > Al Marquardt
> > ampm@xxxxxxx
> > Al Marquardt Electronic Repair
> > 206 W Main
> > Girardville Pa. 17935
> > ----- Original Message -----
> > From: "armando guerra" <birdie@xxxxxxxxxxxxx>
> > To: <techassist@xxxxxxxxxxxxx>
> > Sent: Monday, September 29, 2003 11:06 AM
> > Subject: [TechAssist] Mitsubishi Projo Model VS4507\Shutdn problem
> >
> > > The customer said that some times when he tries to power up the set,it
> > > just clicks but no sound and no pix.He will do this about 4\5 times and
> > > then it finally comes on with a good pix.He brought it in and when I
> > > tried it,I can hear high voltage come up and then shutsdn.
> > > I waited a little while and tried it again and after 4 tries,it did come
> > > on.I don't have the sm but it sounds like it needs the cm-401
> > > kit.(vertical ckt repair) unless this model does not take that kit.I
> > > know that the yokes are a common failure on this sets but from my
> > > experience is that when they go bad,the set will alway's go into shutdn
> > > and will not let the tv come on.Can anyone that remembers this chasis
> > > let me know if it uses the cm kit.Mean while I am going to look at the
> > > caps in the ps.I remember having some caps in that bd also go bad and
> > > cause a no start problem,especially C920 and C911.
> > > Thanks for your help.
> > > Mando
> > > Birdie's TV & Electronics
> > > Casa  Grande, AZ
> > >
> > >
> > 
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Jorge Camboni, GY Electronics, Richardson, TX

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