Your blue tube has a short. What you are seeing is the TV turning on and the blue tube going to full brightness. It then draws enough current that the television's protect circuits shut it down.
Need the full model number which should include a BYX or just YX followed by a number. Going off the D52W20BYX1 the blue tube would be part number 263049 which https://www.encompassparts.com still has a few for $220 before shipping.
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