[TechAssist] Re: Need VS-4544 schematic
- From: "Damon" <DamonEB@xxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Tue, 24 Jan 2006 20:18:28 -0500
VS4544 is a VZ3 chassis
VS50502 is a VZ4 chassis
Although made a year apart, it wouldn't surprise me the IHVT circuit design
is similar.
The transformer is part # 334P246010.
Call CRC at (909) 629-5641 to get the IHVT.
Damon B
Telrad Electronics
Fort Wayne IN
----- Original Message -----
From: "Tri-County Tv" <tricountytv@xxxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Tuesday, January 24, 2006 12:46 PM
Subject: [TechAssist] Re: Need VS-4544 schematic
> Peggs,
> Is there anyway to find out if the VS-4544 is same VS-50502
> except for screen size or at least the power supply board might be the
same?
> Tom Berger
> Tri-County TV
> Robbinsville
> North Carolina 28771
> Ph--828-479-6043
> Fax-828-479-4868
> (tricountytv@xxxxxxxxxxxxx)
> ----- Original Message -----
> From: "peggs" <peggs@xxxxxxxxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>; <techassist@xxxxxxxxxxxxx>
> Sent: Tuesday, January 24, 2006 1:46 PM
> Subject: [TechAssist] Re: Need VS-4544 schematic
>
>
> > Mine DOES have the Focus lead,at an angle,out of the side of the Fly.
> > Got mine from Tritronics $50ish.
> > BTW,one side(pin 8 of the fly circuitry) of R5A28 had -114v on it,the
> > other
> > side was MUCH lower,thus it was overheating.These voltage readings were
> > only there for an instant(shutdown),so MY resistor was just
overheated,not
> > open or increased in Value. I replaced it anyway.Check those Diodes out
of
> > circuit.
> > The PS Secondary voltages were ALL a little low before shutdown.
> >
> > Peggs
> >
> >
> > At 07:35 AM 1/24/06, Tri-County Tv wrote:
> >>Peggs,
> >> I think my fly is bad also as my set acts exactly as yours
did
> >> and
> >>I'll bet these 2 models are similar. My fly # IS 334P24681 or 334P246B1
> >>can't tell if that 8 is a B or an 8. Did your fly have the focus lead
> >>sticking out from the side at an angle? I did check those small diodes
and
> >>other resistors and all are ok. My burned R5A28 has red at one end and
> >>purple at the other end, so it is possible my resistor could be 2.4K as
> >>yours was. I have not started searching for this fly, where did you get
> >>yours?
> >>Tom Berger
> >>Tri-County TV
> >>Robbinsville
> >>North Carolina 28771
> >>Ph--828-479-6043
> >>Fax-828-479-4868
> >>(tricountytv@xxxxxxxxxxxxx)
> >>----- Original Message -----
> >>From: "peggs" <peggs@xxxxxxxxxxxxx>
> >>To: <techassist@xxxxxxxxxxxxx>; <techassist@xxxxxxxxxxxxx>
> >>Sent: Tuesday, January 24, 2006 11:55 AM
> >>Subject: [TechAssist] Re: Need VS-4544 schematic
> >>
> >>
> >> >I just repaired a VS50502 with an overheated R5a28(2.4K).
> >> > The Flyback was bad.... it rang good..... set was shutting down
> >> > immmediately.I could lift the 130v fuse,and the set would stay
> >> > on(careful,slow discharge this 130v when you shut the set off).
> >> > Found a few tips on this model for a couple of bad Diodes(1n4148)
when
> >> > R5a28 is bad........ D5a21,22.
> >> > The Diodes were good in my set.
> >> >
> >> > I'm not sure how similar your set is to this one.
> >> >
> >> > Peggs
> >> >
> >> >
> >> > At 03:11 PM 1/23/06, Tri-County Tv 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" <jstielau@xxxxxxxx>
> >> >>To: <techassist@xxxxxxxxxxxxx>
> >> >>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" <tricountytv@xxxxxxxxxxxxx>
> >> >> > To: <techassist@xxxxxxxxxxxxx>
> >> >> > 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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