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 > > **************************************************************************** * > Classifieds! Buy or Sell! > http://sell.tech-assist.org > The Tech Address Book: > http://www.tech-assist.org/secure/tip/contact.htm > Add a Repair Tip Here, or Change/Remove your Email Address: > http://www.tech-assist.org/secure/tip/main.htm > Lost Password: > http://www.tech-assist.org and select "Lost your Login Info?". > Email Archives: > //www.freelists.org/archives/techassist/ > ***************************************************************************** Classifieds! Buy or Sell! http://sell.tech-assist.org The Tech Address Book: http://www.tech-assist.org/secure/tip/contact.htm Add a Repair Tip Here, or Change/Remove your Email Address: http://www.tech-assist.org/secure/tip/main.htm Lost Password: http://www.tech-assist.org and select "Lost your Login Info?". Email Archives: //www.freelists.org/archives/techassist/