Most likely a problem with the optical engine. that tv is a DLP and it uses a DMD device that is made by texas instruments that has millions of tiny mirrors on the face that move independantly and the white spots are going to be stuck mirrors that are not moving. suggest calling mitsubishi customer support for possible repair accomodation. that repair depending on the labor would be around $1500.00 total parts cost is around $1100.00. mitsubishi customer support 1-800-332-2119
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