[TechAssist] Re: RCA Flyback 237506(fixed!)
- From: Jim Shupe <jim@xxxxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Tue, 6 Apr 2004 13:13:20 -0700 (PDT)
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
> > > >
> > > >
> > >
> >
>
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