[TechAssist] Re: Mitsubishi VS6015R
- From: "Damon" <damon101@xxxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Wed, 3 Mar 2004 08:22:05 -0500
Well here's another possibility......it may not apply to your design,
but.....I found on a VZ2 chassis that the 10V supply on the Vert IC actually
comes from the +12V regulator on the convergence board. It may be the cause
for shutdown of the picture, while the main smps looks/runs good. Also, the
same supply operates the PINCUSHION AND WIDTH IC's. I've had both those IC's
go bad too. Once again the schematics are at the shop, so I'm a little
blind....
Damon Brunger
Telrad Electronic Services
Ft Wayne, IN 46815
----- Original Message -----
From: "Terry H." <tvdoc@xxxxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Tuesday, March 02, 2004 4:16 PM
Subject: [TechAssist] Re: Mitsubishi VS6015R
> I'm sure I missed alot of this but, the 900 series caps on the primary of
> the power supplies should be changed, especially C914 and C920. Also, if
> it's shutting down immediately, you should check ALL the circuits that
> require the 28volts, besides vertical and xray. Unplug the B+ line to the
> audio IC and pull the convergence board out and check for open caps and
> coils at the +/- 28 volt input to that board. Those are a real bitch
though.
> Last one I did was over 80 caps and still could've used more. Good luck.
> Terry H.
> The TV Shop
> Gonzales, Tx
>
> ----- Original Message -----
> From: "Paul" <dntwntv@xxxxxxxxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Tuesday, March 02, 2004 3:07 PM
> Subject: [TechAssist] Re: Mitsubishi VS6015R
>
>
> > I only found one leaking cap in the vertical section way back when I
first
> started working on this dog. I cleaned with acetone and another spray type
> cleaner all around the area replaced the cap as well as the I/C. Later
went
> back and replaced the zener and the cap that goes bad, even though they
> checked good. It still would not power up at that time. Then replaced the
> video outputs because I had that problem recently on another set similar
to
> this one. It came on with the symptoms that I had till now. Now it will
not
> power up again. Talk about gloom and doom! Paul
> > Leonard Caillouet <lcaillo@xxxxxxxxxxxx> wrote:
> > As I said yesterday, I was working on one of these. The complaint was
> > shutdown at power on. Found about a dozen leaky caps, cleaned the
> > electrolyte and corrosion, cleaned up some heat damaged solder joints
and
> > now it is testing. Very often there is no more wrong with these than
that,
> > but if there is you still need to go over all the boards and find the
> leaky
> > caps first to be sure that you won't chase your tail.
> >
> > Leonard Caillouet
> > Electronics World
> >
> > ----- Original Message -----
> > From: "Damon"
> > To:
> > Sent: Tuesday, March 02, 2004 7:23 AM
> > Subject: [TechAssist] Re: Mitsubishi VS6015R
> >
> >
> > > My first thought is.....if 130v is there, and the HV shutdown circuit
> > isn't
> > > triggered....then I would suspect the video jungle's supply -No pix,
bad
> > > vert/horiz......one failure, many symptoms.
> > >
> > > I have the schematics too, but they are at the shop.
> > >
> > > Leonard is right about the caps, I had one of these with intermittant
> > video,
> > > and changed a handful of caps in the video circuit. It didn't fix it,
as
> > the
> > > S-video switch was flaky, but it did improve the picture quality.
> > >
> > > Like you care about that, right? Just throwin' a few at you.
> > >
> > > Damon Brunger
> > > Telrad Electronic Services
> > > Ft Wayne, IN 46815
> > >
> > > ----- Original Message -----
> > > From: "Leonard G. Caillouet"
> > > To:
> > > Sent: Monday, March 01, 2004 3:12 PM
> > > Subject: [TechAssist] Re: Mitsubishi VS6015R
> > >
> > >
> > > > Is the mirror out of position?
> > > >
> > > > This is a V10 chassis. Expect a couple of dozen bad caps and check
the
> > > ones
> > > > at the back of the board between the FBT and IC502 in particular if
> you
> > > have
> > > > a shutdown problem. I have one on the bench right now if you need
some
> > > > comparison measurements, but we are going through all the caps
before
> > > doing
> > > > any troubleshooting. Too may wierd problems on these are due to
> > > electrolyte
> > > > or bad caps.
> > > >
> > > > Leonard G. Caillouet
> > > > Electronics World
> > > > Gainesville, FL
> > > > 352-332-5608
> > > > 352-332-5668 (fax)
> > > >
> > > > ----- Original Message -----
> > > > From: "Paul"
> > > > To:
> > > > Sent: Monday, March 01, 2004 2:13 PM
> > > > Subject: [TechAssist] Re: Mitsubishi VS6015R
> > > >
> > > >
> > > > > As mentioned, the picture is as described at all times. The 130v
is
> > > there
> > > > all the time, as well as the rest of the SMPS voltages. Yes I have
> been
> > > > monitoring with a scope from the start. Yes I have schematics. As
> > > mentioned
> > > > it will not restart after shut down for an hour or so. SMPS uses a
> > relay.
> > > I
> > > > tried to put as much information in the original post as I could
with
> > out
> > > > writing a book. One thing that I didn't mention is that it does try
to
> > > > start. I can see the HV for a split second on my scope.
> > Paul
> > > > > Damon wrote:1 Is your pix normal then
> > shrinks
> > > > before shutting down?
> > > > > 2 If you unplug it after shutdown, will it restart?
> > > > > 3 What is your 130V supply voltage running at before
shutdown/after
> > > > > shutdown?
> > > > > 4 Got schematics for this?
> > > > > 5 Got 'scope for this?
> > > > > 6 Is the SMPS powered thru a relay? If not, are you getting the On
> > > command
> > > > > from the Micro to the switched regulators??
> > > > >
> > > > > Answer these questions and we might have a starting point to
isolate
> > > your
> > > > > problem.
> > > > > (just slip your answers underneath each question)
> > > > >
> > > > > Damon Brunger
> > > > > Telrad Electronic Services
> > > > > Ft Wayne, IN 46815
> > > > >
> > > > > ----- Original Message -----
> > > > > From: "Paul"
> > > > > To:
> > > > > Sent: Sunday, February 29, 2004 10:20 PM
> > > > > Subject: [TechAssist] Mitsubishi VS6015R
> > > > >
> > > > >
> > > > > > This shuts down after 10 to 20 min. Will not start again till it
> > sets
> > > > for
> > > > > an hour or so. It is shrunk vertically top and bottom with a bow
top
> > and
> > > > > bottom. It is pulled in on the sides slightly, with a slight bow.
> > Horiz
> > > > > width adj.does not have enough to fill it on the sides. I have
> > replaced
> > > > the
> > > > > vertical I/C, caps except the tant.caps and zener diode on pin 1
of
> > I/C.
> > > > > Have replaced too many other caps to mention. The power supply
> > voltages
> > > > are
> > > > > all there. Can not find anything over heating. Have been through
the
> > > > > convergence circuit and replaced several bad caps. Have replaced
the
> > > video
> > > > > output transistor on all the picture tube boards.Have replaced the
> > HOT.
> > > > The
> > > > > sound is normal. It gives no symptom before shut down. Don't know
> > where
> > > > else
> > > > > to look. Paul
> > > > > >
> > > > > > Paul ,B
> > > > > Central TV&Video
> > > > > Grover Beach Ca.
> > > > > >
> > > > > >
> > > > >
> > > >
> > >
> >
>
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> > > > > Paul ,B
> > > > Central TV&Video
> > > > Grover Beach Ca.
> > > > >
> > > > >
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> > >
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> > Paul ,B
> Central TV&Video
> Grover Beach Ca.
> >
> >
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