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Lamp Can I test A lamp with an ohm meter

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Yes. It should show low ohms. If you've never used one before compare the readings to a norman light bulb and they should be similar. Keep in mind that oils from your fingers will shorten the lamps life if it is good. So if you need to replace it hold the lamp with a clean lint free cloth. Good Luck.

Posted on Sep 24, 2008

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Before you buy a new lamp, use an Ohm meter to test the across it's contacts for continuity. If the test shows the lamp's circuit is pen (infinity resistance reading on the meter), it will give you more confidence that the lamp is the problem. Also, look for blackening or obvious failure in the filament to confirm it. As has been said, the lamp has a finite amount of run-time before it fails. Think of it as a feature that makes the projection television much easier to keep running indefinitely than a flat panel TV.

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Sure, you can test by Use the screwdriver and remove the protective cover that conceals the ballast.

Observe the ballast before proceeding. If oil is leaking from the ballast, stop here and remove the ballast. Leaking oil indicates that the ballast is damaged beyond any doubt as the internal seal has been ruptured by excessive heat.

Test the high voltage side for continuity between the wires going to the ballast tombstones. There will be either one or two wires going to each tombstone fixture. Regardless of the number of wires, the colors will be the following: Blue or yellow are the power wires and white is the common or neutral wire. this could differ in many models.

Turn the Volt Ohmmeter to "ohms" and touch the ends of the two probes together. The meter should show continuity or a direct short. Touch the probes of the meter to one of the white wires and one of the colored, blue or yellow, or any wires that comes from the ballast. This should show a short or continuous circuit. If it does not, the ballast is bad and should be replaced.

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