[TechAssist] Re: Need VS-4544 schematic
- From: "Tri-County Tv" <tricountytv@xxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Tue, 24 Jan 2006 10:35:44 -0500
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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