Kdde55a20 may need the A-1137-954-A Service Kit and not the thermal fuse (2 coupler) ours did. Costs less than $50 (6 red blinking lights on the power)
P# 19100239 6 blinks indicates fuse. Do not plug set into switched outlet. besure set is allowed to cool down before ac power is ever removed. Thermal fuse is on the optical block under the lamp housing. do goole search for part availability and source.
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I have the same problem with my TV. I had to replace the thermal fuse 3mo after purchace but it was a completely different symptom.
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