[TechAssist] Re: CTC203 won't start and click
- From: "Ed Gaidies" <teltek3@xxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Mon, 20 Jan 2003 11:54:34 -0500
Ken;
Not too many yokes...but a few degaussing coils..;-)
-Ed-
Tel-Tek Electronics
Ontario-Canada
"If Apple and Microsoft can talk...why can't the rest of the World?"
teltek2@xxxxxxxxxxxx
----- Original Message -----
From: <gulftech@xxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Monday, January 20, 2003 1:06 PM
Subject: [TechAssist] Re: CTC203 won't start and click
>
> I imagine most of us have done this, accidently. After repair, you put
> the set back together, but forget to connect the yoke. Power it up and
> see only a bright dot in the center. You say an appropriate word, like
> "darn," and plug the yoke back it. You might say something else if
> you've already put the back on.
>
>
> Ken Smith
> Gulf Technical Services
> 3034 Gulf Breeze Parkway
> Gulf Breeze, FL 32563
> 850-934-8324 (Voice) 850-932-0819 (Fax)
>
>
> On Mon, 20 Jan 2003 05:21:52 -0800 Bil Green <tv.vcrrepair@xxxxxxxxxxx>
> writes:
> >
> > I have been pulling the yoke plug on direct view TVs on ocassion for
> > many years and don't recall seeing a bright dot on sets made in the
> > 1980 or 90s. Have you seen this?
> >
> > When talking to tech support I have not been critised for doing this.
> > At one point GE recommended this proceedure to limit the HV and
> > reduce the chance of blowing a HOT while testing.
> >
> > In the 1960s and 70s this was definately a no-no.
> >
> >
> > --
> > Best regards,
> >
> > Bil Green
> > 2001 TV VCR
> > Mammoth Lakes, California
> > 760-934-2001 mailto:tv.vcrrepair@xxxxxxxxxxx
> >
> >
> > Sunday, January 19, 2003, 2:58:00 PM, you wote:
> >
> >
> > >>One of the first things to do is simply pull the yoke plug . . . .
> >
> > JB> I would never tell anyone to do this.
> > JB> It could burn a spot on the CRT if high voltage does come up.
> >
> > JB> In the good old days they had a jumper or interlock that would
> > JB> break the B+ when the yoke was unplugged.
> >
> > JB> I would remove the CRT socket before trying to run a set without
> > JB> the yoke plugged in.
> >
> > JB> Joe Batchelor CET TX-80
> >
> > JB> 1/13/03 10:44:42 AM, Bil Green <tv.vcrrepair@xxxxxxxxxxx> wrote:
> > >>Hi Pete,
> > >>
> > >>If you have way too much current flowing through the flyback then
> > the
> > >>problem should be in the collector circuit of the HOT (including
> > the
> > >>flyback of course). I don't see how the Gemstar module could cause
> > too
> > >>much current in the collector circuit of the HOT unless the horiz
> > freq
> > >>is way off.
> > >>
> > >>One of the first things to do is simply pull the yoke plug (much
> > easier
> > >>than changing the yoke or troubleshooting the whole circuit).
> > >>
> > >>With the yoke out of the circuit the HV will be much lower than
> > normal
> > >>(may even work if the yoke circuit was the problem).
> > >>
> > >>Good to scope the collector of the HOT also. Make sure your scope
> > can
> > >>handle at least 200VAC and always set the 10x probe to 10X or the
> > >>~1500 or so volts will fry your scope. With the 100W lamp in series
> > >>with the ~130V B+ you may get a reading on the collector. Somewhere
> > >>around 1000VPP (without the light bulb), very clean pulses, about
> > 12us
> > >>wide, ~55us between pulses.
> > >>
> > >>You replaced the flyback, yoke, etc? I almost always check to see
> > >>which parts are actually bad first. Whenever I guess, I'm almost
> > always
> > >>wrong. Expensive to replace a few large parts. Pull the yoke, ring
> > >>test the flyback (or eliminate other possibilities first).
> > >>
> > >>You may want to put the original symptom back into this e-mail so
> > >>people know what the problem is. I forgot what you said.
> > >>
> > >>--
> > >>Best regards,
> > >>
> > >>Bil Green
> > >>2001 TV VCR
> > >>Mammoth Lakes, California
> > >>760-934-2001
> > mailto:tv.vcrrepair@xxxxxxxxxxx
> > >>
> > >>
> > >>Saturday, January 18, 2003, 5:53:06 AM, you wote:
> > >>
> > >>
> > >>
> > >>
> > >>P> Thanks Bil, that's what I get, to much current and no any
> > raster, and as
> > >>P> I wrote in my first post, I've replaced all those parts in the
> > output
> > >>P> circuit. scoping the base drive signal on the HOT, seems to be
> > on
> > >>P> frequency and value.
> > >>
> > >>P> Well..... this is an RCA 203 model chassis...
> > >>P> Do you think that the "GEmstar" module
> > >>P> could be the problem??
> > >>
> > >>
> > >>P> E-mail message
> > >>
> > >>P> Sender: techassist-bounce@xxxxxxxxxxxxx From:
> > tv.vcrrepair@xxxxxxxxxxx
> > >>P> (Bil=A0Green) Date: Wed, Jan 15, 2003, 4:19am (EST-3) To:
> > >>P> techassist@xxxxxxxxxxxxx (Pete)
> > >>P> Subject: [TechAssist] Re: CTC203 won't start and click
> > Reply=A0to:
> > >>P> techassist@xxxxxxxxxxxxx
> > >>
> > >>P> Hi Pete,
> > >>P> When using a 100W lamp in series with the B+ to the flyback, it
> > should
> > >>P> not light up brightly. If it does you have too much current
> > flowing.
> > >>P> If everything is OK you will get a raster (smaller than normal,
> > but good
> > >>P> enough to show that the all the circuits are working).
> > >>
> > >>------------------------------------------
> > >>Submit A Repair Tip For Everyone Here:
> > >>http://www.tech-assist.org/secure/tip/main.html
> > >>------------------------------------------
> > >>To REMOVE your email address, click here:
> > >> http://www.tech-assist.org/unsubb.html
> > >>To CHANGE your email address, click here:
> > >> http://www.techassist.net/forms/change.html
> > >>
> >
> >
> >
> > JB> ------------------------------------------
> > JB> Submit A Repair Tip For Everyone Here:
> > JB> http://www.tech-assist.org/secure/tip/main.html
> > JB> ------------------------------------------
> > JB> To REMOVE your email address, click here:
> > JB> http://www.tech-assist.org/unsubb.html
> > JB> To CHANGE your email address, click here:
> > JB> http://www.techassist.net/forms/change.html
> >
> > ------------------------------------------
> > Submit A Repair Tip For Everyone Here:
> > http://www.tech-assist.org/secure/tip/main.html
> > ------------------------------------------
> > To REMOVE your email address, click here:
> > http://www.tech-assist.org/unsubb.html
> > To CHANGE your email address, click here:
> > http://www.techassist.net/forms/change.html
> >
> >
>
>
> ________________________________________________________________
> Sign Up for Juno Platinum Internet Access Today
> Only $9.95 per month!
> Visit www.juno.com
> ------------------------------------------
> Submit A Repair Tip For Everyone Here:
> http://www.tech-assist.org/secure/tip/main.html
> ------------------------------------------
> To REMOVE your email address, click here:
> http://www.tech-assist.org/unsubb.html
> To CHANGE your email address, click here:
> http://www.techassist.net/forms/change.html
>
------------------------------------------
Submit A Repair Tip For Everyone Here:
http://www.tech-assist.org/secure/tip/main.html
------------------------------------------
To REMOVE your email address, click here:
http://www.tech-assist.org/unsubb.html
To CHANGE your email address, click here:
http://www.techassist.net/forms/change.html
Other related posts:
