Fault at its main digital board. Short circuited component/s at it. Contact any service technician; or the authorized service center. If you wish to get some details; check the sites linked here. Pull up older posts.
https://electronicshelponline.blogspot.com/ http://homenol.blogspot.com/
In most cases, the main board might have to be replaced. If so, a software [firmware] update too might be necessary. /
power in the tv has nothing related with the DVD. The tv has to have raster (white screen) even without signal (cable, DVD, others) if the tv alone is just having the led flashing and neither sound nor video (black screen) The tv has a short circuit in some of the boards that are part of the tv system. the blinking is part of a protection when the tv was created in the factory. Refer to the technician to repair this problem.
SOURCE: Proscan TV
with no picture and no audio i would more than likely suspect the main AV Board needs replacing.
Take the back of your tv and get the part number of the AV board ( THE ONE WITH THE INPUTS AND SCART SOCKETS) then Google or Ebay for a replacement.
95% thisd will cure your problem.
Hope this helps
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