[TechAssist] Re: Mitsubishi VS6015R
- From: Paul <dntwntv@xxxxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Mon, 8 Mar 2004 19:19:49 -0800 (PST)
The regulators are all putting out what they should. My brain is fried from
pouring over this problem so long, but there seems somehow to be a correlation
between the micro and IC 901. I can apply .8v to the relay driver and the set
will come on, the picture tubes will light, and stay on as long as the voltage
is applied. If I disable IC 901 the micro will put out the .8v and the relay
stays closed but of course there is no HV with IC 901 non-op. I have not
figured out why this is happening. I thought maybe one of the protect
circuits, but that is another can of worms. Paul
"Leonard G. Caillouet" <lcaillo@xxxxxxxxxxxx> wrote:You can test this supply
unloaded except the 130v line. Hang a light bulb
on the 130v line, disconnect everything and force the relay by grounding
TPAG. You should be able to check the supplies and determine if the problem
is in the PS or somewhere else. If the PS is OK, I'd be looking in the area
of the three regulators on the signal board and the related caps.
Leonard G. Caillouet
Electronics World
Gainesville, FL
352-332-5608
352-332-5668 (fax)
----- Original Message -----
From: "Paul"
To:
Sent: Monday, March 08, 2004 4:30 PM
Subject: [TechAssist] Re: Mitsubishi VS6015R
> 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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> > Central TV&Video
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