Does anybody know how to make ring tester for flybacks?
For everything you need to know about testing flybacks, I suggest you go here. I have built and used the active circuit tester, and it is neat. Glue problems: I have found that many manufacturers use a “tan” type of glue in their products to mount components to their boards. They only seem to put on either wires to hold them in place or on larger components for mechanical strengthening/stability reasons. Trouble is that this glue, over time, becomes a resistor. I have taken resistance readings below 20K in some instances. It is always difficult to fix these type of problems. If you have a really weird problem check the glue, sounds strange, however, when I am working on a piece of electronic gear and I see that the glue ha discolored, I dig it loose. The glue gets brittle with age and after time offers no holding properties. If need be I will replace it with a drop of silicon glue.
