Sony rear projection 53" TV (approx. 1996) Owner's manual is Color Rear Video Projector, Model # KP-53S15 When TV is turned on, it takes from 10 to 20 minutes for the picture to appear (the sound comes on, though). When shut off after use, it will turn on with picture if too much time has not elapsed. But, if turned off until the next day, it takes the 10 to 20 minutes to "warm up' again. It has done this before. A module was replaced by others approximately 5 years ago which remedied the problem until now. What is the part/module that needs replaced and where can it be purchased in Minneapolis/St. Paul area?

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