[TechAssist] Re: RCA Flyback 237506(fixed!)
- From: Jim Shupe <jim@xxxxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Wed, 7 Apr 2004 13:13:57 -0700 (PDT)
Al...
I grabbed a similar socket from a Zenith in my
boneyard. I generally don't charge for the part in
this type of situation, as I just want to get the
thing out and collected for.
My customer was tickled to death to get the set
back, and that's very important also.
Jim Shupe, CET
Lloyd's TV
Yucca Valley, CA
--- al m <ampm@xxxxxxx> wrote:
> I've run into this problem twice with arcing CRT
> socket. How did you remedy
> problem with replacement CRT socket?
> Al Marquardt
> ampm@xxxxxxx
> Al Marquardt Electronic Repair
> 206 W Main
> Girardville Pa. 17935
> ----- Original Message -----
> From: "Jim Myers" <jr.myers@xxxxxxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Wednesday, April 07, 2004 11:03 AM
> Subject: [TechAssist] Re: RCA Flyback 237506(fixed!)
>
>
> > 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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