Why do we need Blue Ring Tester to test coils instead of using Ohmmeter and Inductance meter?
If you use an ohmmeter or even an inductance meter to test a coil/winding then chances is very high you will not be able to repair the equipment. Why? Because both meters could misled you into believing that a shorted coil/winding is good! That means a coil with shorted turns in the winding could still show you a good Ohm reading and good Inductance value too. If you miss those bad coils during troubleshooting then the rest of the time you use to troubleshoot on other area or components will be wasted because the actual problem is in the coil. What this tester can do 1) Check the primary winding of switch mode transformer in any electronic equipment. 2) Check B+ coil in CRT Monitor Note: For your information B+ coil could also come in the shape like a horizontal driver transformer 3) Check the primary winding of Horizontal driver transformer in CRT Monitors/Tvs 4) Check the primary winding of flyback transformer in CRT Monitors/Tvs 5) Check horizontal yoke coil windings in CRT Monitors
