[TechAssist] Re: RCA Flyback 237506(fixed!)
- From: Jim Shupe <jim@xxxxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Wed, 7 Apr 2004 13:17:13 -0700 (PDT)
Jim..
Next time I'll make sure I bring the #'s home so I
can reference them in the post. My apologies to the
group.
Jim Shupe, CET
Lloyd's TV
Yucca Valley, CA
--- Jim Myers <jr.myers@xxxxxxxxxxx> wrote:
> Jim, the model and chassis numbers are important
> because that's how tips
> are filed and the problem you have fixed is common
> to the CTC197
> chassis, I have had at least 4 and at least 3 or 4
> have been posted on
> this list recently. This failure COULD of course
> happen on any set, but
> for some reason it happens on CTC197 as a matter of
> course. That's why
> the subject line should always contain the brand,
> model and chassis
> information.
>
*******************************************************************************************************************
> Since 1972
> Jim Myers
> Telrad Electronics
> Fort Wayne, Indiana
>
>
> Jim Shupe wrote:
> > 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
> >>>>>>>
> >>>>>>>
> >>>>>>
> >
>
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> >
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