[TechAssist] Re: Need VS-4544 schematic
- From: Paul <dntwntv@xxxxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Tue, 24 Jan 2006 12:32:01 -0800 (PST)
That resistor is not listed in the parts list. It is different for some
models. It has a star by it and there is a legend for the parts with a star
which includes the diodes that I mentioned. There is no value in the legend or
the parts list for R5a28 for the VS 4544. Unfortunately my schematic has been
used so much that there is a tear right through the middle of the values for
the models listed. There is nothing listed for the VS4544. Wouldn't be the
first time that something was omitted or incorrect. I have found many with
Mitsubishi.
Paul
--- Damon <DamonEB@xxxxxxxxxxx> wrote:
> R5a28's value may depend on the set itself....look at the parts list for
> variations, if not there look at the LEGEND normally found on the specific
> page OR the First page of the schematics. The legend will show how the
> schematic's markings are used (ie 56 = 56pf and 5.6 = 5.6 uf)
> They normally put notes about unknown values in there for a reason.
>
> Damon B
> Telrad Electronics
> Fort Wayne IN
> ----- Original Message -----
> From: "Paul" <dntwntv@xxxxxxxxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Monday, January 23, 2006 9:21 PM
> Subject: [TechAssist] Re: Need VS-4544 schematic
>
>
> > Tom
> > The print does not give a value for R5A28 in the VS4544. It does give
> a value of 39K for a VS 4545. The other side of that resistor goes to
> cathode of D5A22. The anode of that diode goes to cathode of D5A21 anode to
> ground. That diode may be shorted. I can copy this section and send it to
> you if you want.
> > Paul
> >
> > Tri-County Tv <tricountytv@xxxxxxxxxxxxx> wrote:
> > Jeff,
> > I have scoped the H.O.T collector and looks distorted , driver
> > transistor output is clean , If I keep turning the set on , R5A28 starts
> to
> > burn, with is off the ACL line from flyback pin# 8 . I am not sure of the
> > value of this resistor. It now measures about 65K. If pin 8 is the low
> side
> > of the internal HV diodes , then maybe I am dealing with a bad fly. I
> think
> > the burning of R5A28 should be clear clue as to where the problem is. I am
> > still working without a schematic.
> > Tom Berger
> > Tri-County TV
> > Robbinsville
> > North Carolina 28771
> > Ph--828-479-6043
> > Fax-828-479-4868
> > (tricountytv@xxxxxxxxxxxxx)
> > ----- Original Message -----
> > From: "Shoreline Electronics"
> > To:
> > Sent: Monday, January 23, 2006 12:27 PM
> > Subject: [TechAssist] Re: Need VS-4544 schematic
> >
> > > Can you scope the collector at startup and see if the pulse is clean or
> > > distorted?
> > >
> > > Keep in mind , these sets have a discrete Horizontal Output section and
> a
> > > HV
> > > section.
> > >
> > > ==========================
> > > Jeff Stielau
> > > Shoreline Electronics Repair
> > > 344 East Main Street
> > > Clinton,CT 06413
> > > 860-399-1861
> > > 860-664-3535 (fax)
> > > jstielau@xxxxxxxx
> > > ========================
> > >
> > > ----- Original Message -----
> > > From: "Tri-County Tv"
> > > To:
> > > Sent: Monday, January 23, 2006 12:18 PM
> > > Subject: [TechAssist] Need VS-4544 schematic
> > >
> > >
> > >> Hello everybody,
> > >> I am in desperate need for a schematic and any
> > >> repair tips for this old Mitsubishi Big screen. It shuts down at turn
> on,
> > >> and draws heavy current from H.O.T I suspect the flyback but it rings
> > >> good
> > >> so maybe a shorted internal high voltage diode. I have a feeling this
> > >> will
> > >> be very hard to find. I am ready to put a match to this dog! I think
> the
> > >> chassis is VZ3 Any help would be greatly appreciated.
> > >> Thomas Berger
> > >> Tri-County TV
> > >> Robbinsville
> > >> North Carolina 28771
> > >> Ph--828-479-6043
> > >> Fax-828-479-4868
> > >> (tricountytv@xxxxxxxxxxxxx)
> >
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> > Paul ,B
> > Central TV&Video
> > 911W Grand Ave
> > Grover Beach Ca.
> > (805)481-8084
> >
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Paul ,B
Central TV&Video
911W Grand Ave
Grover Beach Ca.
(805)481-8084
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