How To Test Ccfl Backlight With Multimeter [better] Link

Since you can't easily test the tube directly, you test the power getting to it.

To perform these tests, you will need:

If your multimeter indicates an open or shorted CCFL, replace the tube. If it passes resistance tests but the screen still doesn’t light, the problem is likely the , wiring , or backlight driver circuit — in which case you’d need an oscilloscope or a known-good CCFL for substitution testing. how to test ccfl backlight with multimeter

A multimeter cannot measure the operating voltage of a CCFL tube while the device is on. Attempting to probe a live CCFL with a standard multimeter will likely destroy your meter and could result in electric shock. Instead, we use the multimeter to test the integrity of the components when the power is off. Since you can't easily test the tube directly,

For a quick functional check without special gear, connect the suspect CCFL to a from a donor screen — if it lights, your inverter is bad; if not, the CCFL is bad. A multimeter cannot measure the operating voltage of