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how to change the screen of a tv sansung 40 inches and where to repair?

micalijuri all of this will depend on the exact model of your TV as well as where you are located. Most times new panels are very difficult to obtain. Often times they cost more than a new TV. You do want to go ahead and remove the back form your TV. You should see a label on the panel that will tell you the exact make and model of it. Use those numbers for an online search to see if your panel is available anywhere. You could always try and get a TV that is broken other than the screen. Then harvest the screen from that.