Since your TV is a DLP, it could be the lamp or the color wheel. The flashing lights are a service code. Some TV manuals will describe the code and others require a service manual for the codes. Either manuals can be found online at a reasonable price. Here is a site I use.
http://www.servicemanuals.net/service.aspx?gclid=CPiusPKC0aYCFUVqKgodNzTUHA
My sharp DLP allows for the user to replace the lamp pretty easily so there is a chance you could be able to replace yours if that is the problem. The color wheel is a different story. That will probably require a service technician.
Good Luck
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