[TechAssist] Re: HELP NEEDED SONY TV MODEL KV-F29MF1
- From: "VRM" <vrmsys@xxxxxxxxxxxx>
- To: "Tech Assist" <techassist@xxxxxxxxxxxxx>
- Date: Wed, 31 Oct 2001 11:07:58 -0000
Hello;
Thanks for all the responses so far. I tried all the advice you gave and
performed all the checks, but the VERTICAL deflection problem is still the
same.
The VERTICAL is not FULLY deflecting. It is centered around 80-90% of the
screen.
The heat dissipation by most critical MAJOR components such as the
HORIZONTAL etc, are very normal, BUT that of the VERTCAL gets warmed up so
quickly.
I have a strong feeling of a possible SHORT CIRCUITING or LACK of REGULATION
of the VERTICAL DEFLECTOR. Can ANYONE suggest the next step I should take? I
will appreciate all guidelines given.
THANKS to ALL.
Viktor
>
> ----- Original Message -----
> From: "Tel-Tek Electronics" <teltek@xxxxxxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Monday, October 22, 2001 9:07 PM
> Subject: [TechAssist] Re: HELP NEEDED SONY TV MODEL KV-F29MF1
>
>
> >
> > If you have a picture, with lack of vertical scan, I would presume the
> > voltages you are trying to measure are there. (nomally). Probably just
> using
> > wrong reference to ground.
> > I would try troubleshooting the vertical now, but keep a close eye on
that
> > H/O transistor, for heat dissapation, in case your lack of vertical is
> > actually poor regulation.
> >
> > -Ed-
> >
> > teltek@xxxxxxxxxxx
> > TEL-TEK ELECTRONICS.
> >
> >
> >
> >
> >
> > ----- Original Message -----
> > From: "VRM" <vrmsys@xxxxxxxxxxxx>
> > To: "Tech Assist" <techassist@xxxxxxxxxxxxx>
> > Sent: Wednesday, September 05, 2001 10:42 PM
> > Subject: [TechAssist] HELP NEEDED SONY TV MODEL KV-F29MF1
> >
> >
> > > Hello,
> > >
> > > This SET came in without POWER. After my preliminary checks I found
out
> > the HORIZONTAL transistor was faulty (SHORT circuiting). I changed it
and
> > the SET came on, BUT the screen vertical deflection is not FULL, i.e.
> > filling only HALF the screen in the MIDDLE.
> > >
> > > B+ (135V) is present, but some voltages indicated on the FLYBACK
> TERMINALS
> > such as 200V, +15V, -15V e.t.c are all not present.
> > >
> > > I DONT HAVE THE SCHEMATICS TO THIS SET. CAN ANYONE HELP BY EMAILING A
> > SCANNED COPY TO ME.
> > >
> > > MY QUESTION to the BOARD is " WHAT CAN CAUSE A HORIZONTAL DEFLECTION
> > TRANSISTOR TO GET SHORTED"? could it be a from the FBT or ???????
> > >
> > > 1. I need ALL possible advice/suggetions from every quarters as to how
> to
> > go about this.
> > >
> > > 2. I suspect one of these to be faulty, i.e. the FLYBACK TRANSFORMER
or
> > the VERTICAL DEFLECTION CHIP (STV 9379), but not very SURE of which.
> > >
> > > Thanks and awaiting responses from all.
> > >
> > > Viktor
> > >
> > > Help make your TechAssist online repair tips
> > > database better! Submit your fixes here:
> > > http://www.circuitwork.com/techassist/tip/#tips
> > > To unsubscribe write to:
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> > > with unsubscribe in the subject line.
> > >
> > >
> >
> > Help make your TechAssist online repair tips
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>
> Help make your TechAssist online repair tips
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