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deffo the bulb life. not a cheap fix as bulbs are very expensive. reset the unit by holding a few buttons.mine resets by holding 2 buttons while off. google master reset for your model and you might get some more user time from the bulb. change bulb asap tho
My vertical black lines on the same projector were temporarily resolved when I squeezed the middle of my projector. When I opened up the projector I discovered a black piece of cardboard glued over the chip board connected the projector's control buttons. It is in plain view...no digging necessary. I noticed that the cardboard was glued haphazardly and had popped up over the 3 little plastic brackets that were intended to hold it in place. I theorized that if I forced the edges of the cardboard under it's intended brackets, it would add pressure...the same pressur I had to apply with my hands from the outside. Amazingly, it worked! How long, only time will tell. Inside everything is held together with tape, glue, pieces of cardboard and a prayer. It is a piece of junk with a bright bulb. I also q tipped and alcoholed a couple of spots but I don't think that was the solution. Hope that helps!
I have sort of the same problem...there was a loud snap(kind of electical spark like) then the unit started humming loudly which changes sound as you move the unit around. The picture remains clear and the fan is quiet in shut down mode...still the wheel you think?
It's a reasonable possibility the main board is blown. Lets make sure it isn't. When you disassembled it did you make note of the orientation of the DLP chip? This is an important part as it needs to be clean and in the right orientation. Also are all the connectors seated correctly, does the main board smell like eggs or sulfer? What is the condition of the input board? If you can have someone look at it, it could be cheaper than you think.
It could possibly be that the access door to the lamp is not completely shut. If you just hear the color wheel turing and no fans is definitely could be that as it was with mine. The little plastic piece on my door that presses the switch to let the projector know the the door is shut broke off on mine and I had to glue it back on.