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firstly make a clean for your projector DMD chips or color weel, if it still ahs whie spots, It should be dead pixels, since for the DMD chips issue. you have to replace a new DMD chips. i have DMD chips fit for Optoma EP761, it will cost USD123 with shipping
usually, white dots problem is reason of the DMD. perhaps the manufcaturer can't directly and singly sell a parts for end user, they always let you send broken machine to their repair store, then ask for high repair cost.
actually, optoma HD67 projector with 1280*720 pixels, so i think you should buy a 1272-6038B DMD chips, if you need further help, please freely contact me again,