[TechAssist] Re: RCA Flyback 237506(fixed!)
- From: "John @ Myers TV" <myers_tv@xxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Wed, 7 Apr 2004 13:24:25 -0400
The first & only one I had came in with a bad IHVT. At first, I let myself
get in a hurry, and "fixed" the socket by cleaning the carbon out of it.
A week later, the IHVT failed. I don't believe it was related, but just in
case, I ordered a new socket. Set has been fine for about 3 weeks so far.
John Myers
Myers TV Service Since 1984
Alliance, OH
ph 330-821-6545
----- Original Message -----
From: "al m" <ampm@xxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Wednesday, April 07, 2004 12:47 PM
Subject: [TechAssist] Re: RCA Flyback 237506(fixed!)
> 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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