[TechAssist] Re: RCA Flyback 237506(fixed!)
- From: Jim Myers <jr.myers@xxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Wed, 07 Apr 2004 10:03:24 -0500
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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