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Can you advise if you hear any humming or buzzing type sounds coming from the TV ? The thing is that the ballast which is the component that powers the lamp is consumable like the lamp. After so long this component will need replacing. A weak ballast will either not put out the power the lamp needs to ignite, or not be able to maintain the level of power the lamp needs to remain lit. This is the second most common part to fail in these TVs. Unless the ballast has already been replaced I believe there is a good possibility that the ballast could be the problem.