>One of the first things to do is simply pull the yoke plug . . . . I would never tell anyone to do this. It could burn a spot on the CRT if high voltage does come up. In the good old days they had a jumper or interlock that would break the B+ when the yoke was unplugged. I would remove the CRT socket before trying to run a set without the yoke plugged in. Joe Batchelor CET TX-80 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 > ------------------------------------------ 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