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This is most likely the B+ voltage in the tv. You can tell the B+ voltage by looking inside the tv (only if you know what you're doing, VERY HIGH VOLTAGE) and you can see a block box shape with a single red wire running out of the top. This powers the projectors and over time can't keep up with the electric need. Replacement is easy as long as you can find the same model.
I think the problem is either the power supply/High Voltage board or the IHVT (Integrated High Voltage Transformer). I don't have schematics for this model, in addition you will need to take the IHVT out and perform a ring test on it, also I would advise you to check and see if the Horizontal Output transistor is shorted also, you can do this with an ohmmeter (measure between the collector and ground it should have a high reading if the reading is low the transistor is bad). The ring test can be performed with the use of a Universal Video Analyzer, or a LCR analyzer.