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Unfortunately you are having a issue with your DMD board. It sounds like it is starting to fail and you will not have a picture soon. The sound stays on due to the TV not detecting the issue yet, but it will also cut out when it does. You might be able to fix this problem on your on if you find the part for sell.
The television may be repairable most tv shops ask a $20 fee to look at and tell youyes or know as to how to get rid of it if you dont want to bother with it all take it to your local dump and pay $10 for correct disposal.
Honetly to me it sound like thepower board was hit and can be repaired,
This is more likely a power supply failure. Most causes of tv failure are due to bad capacitors on either a system board or the power supply. In this case, it sounds like the power supply. You can test the capacitors with a capacitor tester to determine faulty capacitor. You can also test other components like power supply current with voltmeter or mulit-tester.
I can only suggest that you read the manuel it should give you guidelines for this problem .. if you do not have the manuel you may be able to download one in PDF form from the manufacturers .
The other slight possibility is if the projection unit is a rear free standing type it may have been pushed closer to the screen some how perhaps during a furniture reshuffle I have had this happen before and people dont think of it untill the engineer ask's ? .. regards Vortash