[TechAssist] Re: Need VS-4544 schematic
- From: peggs <peggs@xxxxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx, <techassist@xxxxxxxxxxxxx>
- Date: Tue, 24 Jan 2006 08:55:54 -0800
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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