Welcome. I am Mike, an experienced field technician. We are now connected together on this convenient website where I am able to help you.
3 blinks means the tv is not detecting that the lamp door is put back on the tv and/or the lamp is not seated properly into the tv. There a some tiny switches inside the tv that the door and the lamp make contact with. Try reseating the lamp and make sure the door is on fully. Otherwise the switches inside the tv need service (reply for more details).
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