Check the Lamp Fan it could be defective . If the Lamp Fan stops running set will shut off to protect the Lamp other wise Lamp will burn up if Fan is Not running.If the Lamp Fan is OK then it will be the Ballast Board that connects to Lamp ,it is what powers Lamp on.
Sometimes I find better deals on EBay for TV Parts.
Encompass Parts Distribution is another Place to check for Parts /Prices and Part Numbers
1-800-638-3328
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