[TechAssist] Re: JVC TV AV2749S, yoke arcing at CRT neck
- From: Gary McCartney <gary@xxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Thu, 14 Aug 2003 09:44:41 -0400
Thanks ED. I'll try that.
I finally joined up the tech assist memebers page. I can't figure out
where to upload schematics or to retreive them either. Do you still need
the manual for that hansol monitor? Sorry I didn't get to this earlier.
Been very busy trying to catch up. This woman of mine taking up all my
time :)
Gary
Teltek3 wrote:
>
> Gary;
>
> Make sure it clean, cover the spot with a piece of scotch tape, use some
> nail polish before you put the other yoke on. I don't think that physically
> it will be a spot to worry about.
>
> -Ed-
> Ed Gaidies
> Tel-Tek Electronics
> Ontario-Canada
> teltek3@xxxxxxxxxxxx
> ----- Original Message -----
> From: "Gary McCartney" <gary@xxxxxxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Thursday, August 14, 2003 1:16 AM
> Subject: [TechAssist] JVC TV AV2749S, yoke arcing at CRT neck
>
> > I have this JVC TV model AV2749S in the shop and I have found that the
> > yoke is shorted where it wraps around the neck of the CRT, causing a
> > black burn mark on the glass. I took a knife and scraped it off but
> > there is a slight crater in the glass now, maybe 1/64 of an inch or so
> > deep. Is this a weak spot from now on, meaning that this spot will be
> > suseptable to more arcing in the future or worse yet, a crack in the
> > neck? Can I apply some epoxy to the spot to give it insulation, or
> > should this tube be scrapped? I have a used yoke which looks to be in
> > great shape which I can use in the set so I hate to tell the customer it
> > is garbage.
> >
> >
> > Here is a photo of the mentioned spot on the glass:
> >
> > http://www.number63.ca/tube-neck.jpg
> >
> >
> >
> > How I found the bad yoke:
> >
> > The set came in with F902, 1.25 Amp fuse open. I couldn't find any
> > defective parts so I installed a new fuse in case that was the only
> > problem. Pressed power button and saw LED blink and that was all- the
> > fuse was open again. Next, I looked up tips and found one that mentioned
> > the yoke as a possibility, so I pulled the CRT board and the yoke
> > connectors. The LED came on and stayed. Then I reconnected the hor.
> > winding and put a new fuse in. Had to use 1.5A instead of 1.25. I used a
> > variac set at 90VAC and plugged it in. The LED came on and I heard the
> > arcing and saw smoke coming from the yoke/ CRT neck.
> >
> >
> > Thanks for any help.
> > --
> >
> >
> >
> >
> > Gary McCartney
> >
> > McCartney Electronics
> > Guelph Ontario Canada
> > Est. 1984
> > email: gary (at) number63.ca
> >
> >
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--
Gary McCartney
McCartney Electronics
Guelph Ontario Canada
Est. 1984
email: gary (at) number63.ca
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