[TechAssist] Re: HELP NEEDED SONY TV MODEL KV-F29MF1
- From: "Joey Baker" <docwade2@xxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Wed, 31 Oct 2001 09:30:44 -0500
Buy a good ESR Meter and find the bad cap or caps in the Vertical Deflector
.
docwade2@xxxxxxxx
----- Original Message -----
From: "VRM" <vrmsys@xxxxxxxxxxxx>
To: "Tech Assist" <techassist@xxxxxxxxxxxxx>
Sent: Wednesday, October 31, 2001 6:07 AM
Subject: [TechAssist] Re: HELP NEEDED SONY TV MODEL KV-F29MF1
>
> 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
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> > > > with unsubscribe in the subject line.
> > > >
> > > >
> > >
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> >
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>
> Help make your TechAssist online repair tips
> database better! Submit your fixes here:
> http://www.circuitwork.com/techassist/tip/#tips
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> techassist-request@xxxxxxxxxxxxx
> with unsubscribe in the subject line.
>
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