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 >>>>>>> >>>>>>> >>>>>> > -------------------------------------------------------------------------- > >>>>>>--- >>>>>> >>>>>>>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/ > ----------------------------------------------------------------------------- Lost Password: http://www.tech-assist.org and select "Login Problems?". 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