[TechAssist] Re: CTC203 won't start and click
- From: "Trac Dang" <t8872695@xxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Wed, 22 Jan 2003 14:29:24 -0800
Hello friends.
I remember months ago somebody told me that when remove crt board The high
voltage can make arc through the connector pins of crt. So I think it is
safe to cover
the crt pins when remove crt board (specialy with PTV).
Dang
TD electronics
----- Original Message -----
From: Tel-Tek Electronics <teltek3@xxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Wednesday, January 22, 2003 12:18 PM
Subject: [TechAssist] Re: CTC203 won't start and click
>
> Not a good Service Procedure to run sets above 27" with the CRT socket
> disconnected.
> Although sometimes you have little choice.
>
> -Ed-
> ----- Original Message -----
> From: "J Silverman" <greentron@xxxxxxxxxxxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Wednesday, January 22, 2003 2:45 PM
> Subject: [TechAssist] Re: CTC203 won't start and click
>
>
> >
> > Asked the tech from a local tv repair shop about that and he said that
> they
> > powered up a big screen Manavox with the crt socket unplugged and
> something
> > arced in the neck and it broke off.
> > Jerry Silverman
> > Greentron Inc
> > 4 Newland Ave
> > Greenville SC 29609
> > 864 232 3889
> > Fax 271 2080
> > mailto:greentron@xxxxxxx
> > ----- Original Message -----
> > From: <tvservice@xxxxxxxxxxxxx>
> > To: <techassist@xxxxxxxxxxxxx>
> > Sent: Wednesday, January 22, 2003 1:04 PM
> > Subject: [TechAssist] Re: CTC203 won't start and click
> >
> >
> > >
> > > Only Zenith tubes
> > > and there already bad:>)
> > > Robert
> > > tvservice@xxxxxxxxxxxxx
> > > H & H Electronics Inc
> > >
> > > ----- Original Message -----
> > > From: "Philip Bader" <tjanphyl@xxxxxxxxxxxxxxx>
> > > To: <techassist@xxxxxxxxxxxxx>
> > > Sent: Wednesday, January 22, 2003 8:17 AM
> > > Subject: [TechAssist] Re: CTC203 won't start and click
> > >
> > >
> > > >
> > > > Be careful on pulling the CRT board and powering up. I remember
> numerous
> > > > posts on the larger CRTs (35'?) that this would damage the
CRT.Screen
> > > > reduction or CRT filament line disconnection would be safe.
> > > > Phil Bader
> > > >
> > > > Bil Green wrote:
> > > > >
> > > > > > would turning down the screen voltage stop the burning of the
CRT?
> > > > >
> > > > > It sure would. Pulling the CRT board off will too.
> > > > >
> > > > > --
> > > > > Best regards,
> > > > >
> > > > > Bil Green
> > > > > 2001 TV VCR
> > > > > Mammoth Lakes, California
> > > > > 760-934-2001
> mailto:tv.vcrrepair@xxxxxxxxxxx
> > > > >
> > > > > Tuesday, January 21, 2003, 6:18:02 PM, you wote:
> > > > >
> > > > > am> Now this might seem like a stupid question but would turning
> down
> > > the screen
> > > > > am> voltage stop the burning of the CRT?
> > > > > am> al marquardt
> > > > > am> ampm@xxxxxxx
> > > > >
> > > > > am> ----- Original Message -----
> > > > > am> From: "Jeff Dougherty" <support@xxxxxxxxxxxxxxxxxx>
> > > > > am> To: <techassist@xxxxxxxxxxxxx>
> > > > > am> Sent: Tuesday, January 21, 2003 4:24 PM
> > > > > am> Subject: [TechAssist] Re: CTC203 won't start and click
> > > > >
> > > > > >>
> > > > > >> Yes, I have seen it in 90 sets, at least.
> > > > > >> I never left it on long enough to burn the phosphors.
> > > > > >> support@xxxxxxxxxxxxxxxxxx
> > > > > >> FAX 717-564-4952
> > > > > >> Jeff Dougherty
> > > > > >> Intrepid Video & Electronics Be careful of your thoughts.
> > > > > >> 501 Luther Rd They may become your words
> > > > > >> Harrisburg, PA 17111 any moment.
> > > > > >> 717-909-8844
> > > > > >> VCR tips, electronics info & general interest.
> > > > > >> www.intrepid-video.com www.tech-repair.net
> > > > > >> www.thetoolcaddy.com www.9-11-2001tragedy.com
> > > > > >>
> > >
***********************************************************************
> > > > > >>
> > > > > >> ----- Original Message -----
> > > > > >> From: "Bil Green" <tv.vcrrepair@xxxxxxxxxxx>
> > > > > >> To: "Joe Batchelor" <techassist@xxxxxxxxxxxxx>
> > > > > >> Sent: Monday, January 20, 2003 8:21 AM
> > > > > >> Subject: [TechAssist] Re: CTC203 won't start and click
> > > > > >>
> > > > > >>
> > > > > >>
> > > > > >> 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
> > > > > am> 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:
> > > > > am> 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
> > > > > am> 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
> > > > > am> good
> > > > > >> >>P> enough to show that the all the circuits are working).
> > > > > >> >>
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> > > > > >>
> > > > > >>
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> > > > >
> > > > > am> ------------------------------------------
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> > > >
> > > > --
> > > > Philip Bader
> > > > Jan Phyl TV Inc. (estab. 1976)
> > > > 3420 Recker Hwy. Winter Haven, Fl. 33880
> > > > Fax (863) 299-8821
> > > > email: tjanphyl@xxxxxxxxxxxxxxx
> > > >
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