[TechAssist] Re: Mitsubishi VS6015R
- From: Paul <dntwntv@xxxxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Mon, 8 Mar 2004 14:14:40 -0800 (PST)
One more question. Can forcing the relay on at TPAG to ground create a problem.
That is an area that I have overlooked. I shorted it and held it long enough to
see if the tubes light up and they do. This may be the answer. Paul
Paul <dntwntv@xxxxxxxxxxxxx> wrote:I am still trying to fix this thing and have
replaced, along with a myriad of other things, both I/C 900 & 901 as well as
the HOP and vert. I/C twice. plus all the caps that checked bad. When the set
powers up it shuts right back down. I have disconnected the B+ plug to the HOP
and it still shuts down. If I disconnect L911, which completes the primary
winding on T902, it will not shut down. This seems to me that something in the
primary or secondary of T902 is where the problem is. I have replaced all the
caps and resistors in both primary and secondary of T901&902 that were bad and
some that were not bad. The 130 volts is always there, if only for a brief
moment before shut down. It seems then, that would leave something on another
board that the 901 I/C supplies. I have checked all the sections that are
supplied by I/C901. I have pulled each plug one at time and it makes no
difference in the problem. I can not figure out why it does not shut down
when L911 is disconnected.
One of
the supplies go to the I/C that supplies the horiz.signal so naturally no HV
when disconnected. I hope this is not as confusing as it sounds. Paul
Damon wrote: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."
To:
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"
> To:
> 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 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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> > Paul ,B
> Central TV&Video
> Grover Beach Ca.
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