[TechAssist] Re: CTC203 won't start and click
- From: "Jeff Dougherty" <support@xxxxxxxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Tue, 21 Jan 2003 16:24:28 -0500
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 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).
>>
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