[TechAssist] Re: Mitsubishi VS5007R AND VS5017R SCHEMATICS
- From: Jorge Camboni <geo@xxxxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Tue, 19 Aug 2003 04:05:05 -0500
Hi Terry, Bob, Leon and Al.
I just fixed the V12 chassis (VS4517R), changed a few more caps in
the signal (side) board, vertical IC (LA7838) and R534 (1.2ohm 1/w)
from the flyback to the 27v rectifier. That restored vert deflection
and video.
I am finding quite a few bad caps on the V11 chassis (VS5007R)
ESPECIALLY AROUND PIP neighbourhood (no schematics, I just
found the blue trimpots labeled "pip sumthing") Also checking the
PS and signal board.
Hope it is going to fix it ( the truth will show up at the customer's
family room).
FROM NOW ON, I AM GOING TO BE MORE CAREFUL
checking for bad caps in these Mitsubishi chassis.
And I'll estimate higher!! :o))
Thanks everybody
Jorge
At 08:33 a.m. 18/08/03 -0400, you wrote:
>Had the same problem. It turned out to be the PIP circuit. Caps in the PIP
>circuit were bad. It's an on board PIP and it's on the main board sort of in
>the center towards the left hand side. I also change 92 other caps in this
>monster.Check all the boards you'll see em.
>al marquardt
>ampm@xxxxxxx
>Al Marquardt Electronic Repair
>206 W Main
>Girardville Pa. 17935
>----- Original Message -----
>From: "Jorge Camboni" <geo@xxxxxxxxxxxxx>
>To: <techassist@xxxxxxxxxxxxx>
>Sent: Sunday, August 17, 2003 9:29 PM
>Subject: [TechAssist] Re: Mitsubishi VS5007R AND VS5017R SCHEMATICS
>
>
> >
> > Leonard, in the case of the 5007R it had been done (?) maybe
> > 1 year or 2 ago, I found it resoldered here and there, you know,
> > not a very neat job, but the only problem was picture rolling vertically,
> > in other words, no vertical sync. I dismanteled it at the customer's
> > place and brought the 2 main modules to the workshop.
> > I left the power supply board aside because it was obvious the
> > problem was not there. After esr-ing all the way, found a bunch
> > of 10mf 50 volts dry caps and a few more, don't remember the
> > values now. One of them coincided with a former tip from WA6ATI , so
> > I felt confident and put everything together again.. SAME PROBLEM
> > I really feel I need the schematic, I can not go on blind testing
>component
> > after component, whitout even knowing the sinc pulses path..
> >
> > The other one is a VS4517R (same as VS5017R) and it came with a
> > TO220 pnp transistor (the kind formerly used for vert out) and a 100 ohms
> > resistor burned-open (I had to guess the value) After that it comes on
>normally
> > (HV - fils OK) but with a nice black screen, nothing you do can awake the
> > tubes,
> > the voltage at the video outputs' collectors is a nice 224v all the time.
> > I had not paid attencion to the video and in-out board on the side but
> > there are
> > several UGLY traces of capacitors leaking hard..
> >
> > To put it a little worse, I ESTIMATED LOW, which has been extremely
>stupid
> > from my part!! I had fixed several of them in the past, but it seems I
>'ve
> > forgotten
> > to change ALL the caps and ESTIMATE HIGH.
> >
> > Thank you very much for your help
> > best regards
> > Jorge
> >
> >
> >
> > At 01:20 p.m. 17/08/03 -0400, you wrote:
> > >Jorge, you will need to check all five major boards carefully for leaky
> > >caps. Estimate high. We rebuild lots of these and almost always see
>over
> > >100 bad electrlytics on the V11 and 30 - 60 on the V12. If you don't go
> > >over the boards carefully and clean them up and resolder bad joints you
>can
> > >expect more problems. These manuals were never available from Mits
> > >electronically. Unless someone has scanned it you won't find it online.
>I
> > >have a copy on paper for both, if you need some part of it I can fax it
>to
> > >you. What kind of problems are you having? I don't have anything on the
> > >ctc211a.
> > >
> > >Leonard Caillouet
> > >Electronics World
> > >Gainesville, FL
> > >
> > >
> > >----- Original Message -----
> > >From: "Jorge Camboni" <geo@xxxxxxxxxxxxx>
> > >To: <techassist@xxxxxxxxxxxxx>
> > >Sent: Sunday, August 17, 2003 5:41 AM
> > >Subject: [TechAssist] Mitsubishi VS5007R AND VS5017R SCHEMATICS
> > >
> > >
> > > >
> > > > Mitsubishis VS5007R (chassis V11) and VS5017R (chassis V12)
> > > > ruining my life. Anybody knows a source for those service manuals
> > > > or just schematics ONLINE for this models/chassis?? CUSTOMERS WON'T
> > > > WAIT until a paper manual arrives.... (no sams, no tvdiagrams)
> > > > Looking for CTC211A schematics, as well..
> > > > TIA
> > > > Jorge
> > > >
> > > >
> > > >
> > > > Jorge Camboni, GY Electronics, Richardson, TX
> > > >
> > > >
> >
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> > Jorge Camboni, GY Electronics, Richardson, TX
> >
> >
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Jorge Camboni, GY Electronics, Richardson, TX
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