Thank you for posting your question on Just Answer! I will be happy to help you with this problem. Can you please give us some more information so I can better answer your questions.
-What is the model number for the television? (this can be found on the back of the unit)
-Is the light flashing a pattern? (example 5 blinks pause 5 blinks pause repeat)
Please give me this information and I will be happy to assist you further.
Ok, if there are no problems with the picture when it is working then I am going to say that you most likely have a bad Z801 module...
This is a module that has been notorious for failing in your model causing it to do exactly what yours is doing...works when it wants to shuts off when it doesn't, causes weird effects in the picture and so on..
This can be replaced by a trained technician and will run you somewhere around $300-$350 for the repair. I am about 90% certain that this is your issue.
If this isn't your issue then most likely it will be a failure in the convergence circuit, this repair will run more around $400 to have completed by a tech.
There are a couple of other issues that I can think of that could possibly cause this as well but it would be unlikely, they include the vertical and the power supply, these would still run you somewhere between $300-$400.
So the botXXXXX XXXXXne here is you should be expecting a bill of somewhere between $300-$400, but the set is very repairable, you will just need to decide if it is worth that kind of money to you or not. Please let me know if there is anything else I can do for you.
If you would like any additional information or have more questions please don't hesitate to ask!
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I would say odds are about 90% that you will get 2 more years. Also I would stay away from DLP I would go for an LCD with a 5 year warranty.
If you have any other questions please don't hesitate to ask!