[TechAssist] Re: Need VS-4544 schematic
- From: "Damon" <DamonEB@xxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Tue, 24 Jan 2006 07:46:58 -0500
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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