[TechAssist] Re: Need VS-4544 schematic

  • From: "Tri-County Tv" <tricountytv@xxxxxxxxxxxxx>
  • To: <techassist@xxxxxxxxxxxxx>
  • Date: Tue, 24 Jan 2006 12:46:06 -0500

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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