When a ceiling light fixture fails to illuminate even though a multimeter confirms that line voltage is successfully reaching the socket terminals, the problem is typically caused by poor electrical contact, a defective lamp, or a broken internal path. Common culprits include a corroded or flattened center contact tab inside the socket that fails to touch the bulb base, using an incompatible non-dimmable LED bulb, or a blown internal driver. You can troubleshoot socket continuity safely by shutting off power at the circuit breaker. You can verify that your corrective action is successful when gently lifting the socket contact tab with a non-conductive tool or replacing an incompatible bulb with a certified LED lamp restores steady illumination to the fixture.
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