At 15:35 -0800 11/9/10, Peter Haas wrote: >However, ANY repairs on a CRT's analog board must, necessarily, be effected >by well-trained personnel.
Remembering that good advice. . . It's possible, given the really possibility of bad storage by the previous owner, that you might luck out and need only to clean the wire that runs from the flyback to the picture tube. A layer of partially conductive crud on the high voltage insulators or on the back surface of the tube can make the intermittent sparks you report. You DO need to discharge the tube though.. Unplugged from the wall for a week should do it. Personally I use a long metallic probe with a ground lead to the spring that usually grounds the carbon coating, "aquadag", on the tube to the metal of the computer box. I made the tool from an old long screwdriver with a plastic handle and a clip lead. The procedure is to slide the grounded tool under the rubber cap that covers the connection to the tube in a way that makes contact with the center wire. If you're the slightest bit uncomfortable with that go for two weeks to get things discharged or find a friend who has done it. (I'm probably biased a bit. I did my thesis with a 200,000 volt accelerator.) Cleaning with some dry alcohol or even soap and water with a good rinse is pretty easy. Let it dry well and test. You might luck out. If not, it is the flyback, or possibly a cracked tube, and not worth fixing. -- --> If it's not on fire it's a software problem. <-- -- You received this message because you are a member of G-Group, a group for those using G3, G4, and G5 desktop Macs - with a particular focus on Power Macs. The list FAQ is at http://lowendmac.com/lists/g-list.shtml and our netiquette guide is at http://www.lowendmac.com/lists/netiquette.shtml To post to this group, send email to g3-5-list@googlegroups.com For more options, visit this group at http://groups.google.com/group/g3-5-list
