[TechAssist] Re: RCA Flyback 237506(fixed!)
- From: Jim Shupe <jim@xxxxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Tue, 6 Apr 2004 18:04:13 -0700 (PDT)
Phillip..
The chassis and model are really not important, as
the problem was really a generic type...that is, not
brand, model, or chassis-specific in nature.
The chassis in question was CTC197, I believe.
At any rate; I correctly diagnosed the original
fault as a shorted IHVT, but failed to properly
isolate and locate the cause of missing screen supply
with the replacement IHVT, which was a shorting
spark-gap in the CRT socket. I wrongly assumed the new
part was defective. Reading too many stories about
counterfiet parts, I guess.
My point about the "generic" nature of the fault is
that every CRT-equipped television uses the same
approach to interface the tube to the chassis;
therefore the design, and hence the failure, is not
unique to any manufacturer, chassis, or model.
Jim Shupe, CET
Lloyd's TV
Yucca Valley, CA
--- "Phillip R. Hull" <phil245@xxxxxxxxxxxxx> wrote:
> I sure would like to know what was fixed Chassis
> #??
> Phillip R Hull STET
> phil245@xxxxxxxxxxxxx
> FAX 517--569-3075
> Professional Technicians only
> ----- Original Message -----
> From: "Jim Shupe" <jim@xxxxxxxxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Tuesday, April 06, 2004 4:13 PM
> Subject: [TechAssist] Re: RCA Flyback 237506(fixed!)
>
>
> > John...
> >
> > This is a newer foil pattern that doesn't have
> the
> > jumper... I've never had one inadvertently come
> off
> > with my solder-sucking anyhow, but I've read the
> sheet
> > that comes with the part.
> >
> > I guess I just had a brain fart last week and
> missed
> > the most elemental possibility(which you pegged).
> The
> > last shorted CRT spark-gap short I had was on a
> fairly
> > new Zenith Chroma Color II, so I guess it drifted
> out
> > of my head as a possibility.
> >
> > I checked with my ohmmeter when I got to the
> shop
> > this morning and couldn't detect the short, but
> when I
> > lifted the 2.2K series resistor to the G2 land, I
> got
> > screen supply(I should have done that last week- I
> > know better!). Once I removed the socket, I could
> see
> > the burn on the board, on the socket at G2 and at
> > ground.
> >
> > Anyway the set's fixed, I feel properly
> chagrined,
> > and the customer's happy.
> >
> > Thanks for the tip, John, and thanks to
> everyone
> > else who took the time to respond.
> >
> > Jim Shupe, CET
> > Lloyd's TV
> > Yucca Valley, CA
> >
> > An
> >
> > --- "John @ Myers TV" <myers_tv@xxxxxxxxxxxxx>
> wrote:
> > > Jim,
> > >
> > > I just changed one since I e-mailed you.
> > >
> > > There is a chip jumper between pins 7 & 8 of the
> > > fly. No video is one of the
> > > symptoms if the jumper is missing.
> > >
> > > John Myers
> > > Myers TV Service Since 1984
> > > Alliance, OH
> > > ph 330-821-6545
> > > ----- Original Message -----
> > > From: "Jim Shupe" <jim@xxxxxxxxxxxxx>
> > > To: <techassist@xxxxxxxxxxxxx>
> > > Sent: Tuesday, April 06, 2004 10:36 AM
> > > Subject: [TechAssist] Re: RCA Flyback 237506
> > >
> > >
> > > > John..
> > > >
> > > > No, this one doesn't have the jumper. I am
> going
> > > to
> > > > check the CRT socket though, as it's still
> > > connected.
> > > > Thanks for the input!
> > > >
> > > > BTW.. the original was shorted, but still
> rang
> > > good
> > > > with my trusty Heathkit ringer. I think this
> is
> > > common
> > > > with this family of IHVT's.
> > > >
> > > > Jim Shupe, CET
> > > > Lloyd's TV
> > > > Yucca Valley, CA
> > > >
> > > >
> > > > --- "John @ Myers TV" <myers_tv@xxxxxxxxxxxxx>
> > > wrote:
> > > > > Jim,
> > > > >
> > > > > I just had one like that that turned out to
> be a
> > > > > shorted CRT socket.
> > > > > Also, is this the one that has the jumper
> > > between
> > > > > the two pins on the fly?
> > > > > those have a nasty habit of "disappearing"
> while
> > > > > resoldering.
> > > > >
> > > > > John Myers
> > > > > Myers TV Service Since 1984
> > > > > Alliance, OH
> > > > > For Professional Technicians ONLY
> > > > > ph 330-821-6545
> > > > >
> > > > > ----- Original Message -----
> > > > > From: "Jim Shupe" <jim@xxxxxxxxxxxxx>
> > > > > To: <techassist@xxxxxxxxxxxxx>
> > > > > Sent: Tuesday, April 06, 2004 10:11 AM
> > > > > Subject: [TechAssist] RCA Flyback 237506
> > > > >
> > > > >
> > > > > > Hey Guys...
> > > > > >
> > > > > > Has anyone had problems lately with this
> > > > > part(new)
> > > > > > or am I just getting dumb in my old age?
> > > > > > I have installed two new IHVT's in this
> set
> > > and
> > > > > both
> > > > > > had no screen voltage output. The heaters,
> HV,
> > > > > > secondary supplies are all there.
> > > > > > To my knowledge, the screen output is
> > > totally an
> > > > > > internally derived voltage(at least in
> RCA).
> > > > > > BTW.. I removed everything from the
> screen
> > > > > output to
> > > > > > eliminate possible shorts.
> > > > > >
> > > > > > This has me baffled as I have never had
> a
> > > > > problem
> > > > > > with a new RCA fly.
> > > > > >
> > > > > >
> > > > > > Jim Shupe, CET
> > > > > > Lloyd's TV
> > > > > > Yucca Valley, CA
> > > > > >
> > > > > >
> > > > >
> > > >
> > >
> >
>
--------------------------------------------------------------------------
> > > > > ---
> > > > > > Lost Password:
> > > > > > http://www.tech-assist.org and select
> "Login
> > > > > Problems?".
> > > > > > Email Archives:
> > > > > >
> //www.freelists.org/archives/techassist/
> > > > >
> > > > >
> > > > >
> > > >
> > >
> >
>
--------------------------------------------------------------------------
> > > ---
> > > > > Lost Password:
> > > > > http://www.tech-assist.org and select
> "Login
> > > > > Problems?".
> > > > > Email Archives:
> > > > >
> //www.freelists.org/archives/techassist/
> > > >
> > > >
> > > >
> > >
> >
>
--------------------------------------------------------------------------
> > > ---
> > > > Lost Password:
> > > > http://www.tech-assist.org and select "Login
> > > Problems?".
> > > > Email Archives:
> > > > //www.freelists.org/archives/techassist/
> > >
> > >
> > >
> >
>
--------------------------------------------------------------------------
> ---
> > > Lost Password:
> > > http://www.tech-assist.org and select "Login
> > > Problems?".
> > > Email Archives:
> > > //www.freelists.org/archives/techassist/
> >
> >
> >
>
--------------------------------------------------------------------------
> ---
> > Lost Password:
> > http://www.tech-assist.org and select "Login
> Problems?".
> > Email Archives:
> > //www.freelists.org/archives/techassist/
> >
> >
>
>
>
-----------------------------------------------------------------------------
> Lost Password:
> http://www.tech-assist.org and select "Login
> Problems?".
> Email Archives:
> //www.freelists.org/archives/techassist/
-----------------------------------------------------------------------------
Lost Password:
http://www.tech-assist.org and select "Login Problems?".
Email Archives:
//www.freelists.org/archives/techassist/
Other related posts:
