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). > > > > >> >> > > > > >> >>------------------------------------------ > > > > >> >>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 > > > > >> > > > > >> > > > > >> > > > > >> ------------------------------------------ > > > > >> 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 > > > > >> > > > > >> > > > > >> > > > > > > > > am> ------------------------------------------ > > > > am> Submit A Repair Tip For Everyone Here: > > > > am> http://www.tech-assist.org/secure/tip/main.html > > > > am> ------------------------------------------ > > > > am> To REMOVE your email address, click here: > > > > am> http://www.tech-assist.org/unsubb.html > > > > am> To CHANGE your email address, click here: > > > > am> 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 > > > > > > -- > > > Philip Bader > > > Jan Phyl TV Inc. (estab. 1976) > > > 3420 Recker Hwy. Winter Haven, Fl. 33880 > > > Fax (863) 299-8821 > > > email: tjanphyl@xxxxxxxxxxxxxxx > > > > > > ------------------------------------------ > > > 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 > > > > ------------------------------------------ > 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