Cordial greeting, friend for the repair of led tv several tools are necessary, including a led tester, with which you can independently test the source of the TV in question the different LED strips of the various brands and references of the televisions, soldering station with variable temperature, both for the part of the heat blower and the captive gun, analog multimeter, which is very effective to test the LEDs independently, in all cases an oscilloscope is very useful , a good digital multimeter and not the welding gun and normal captivity, these are some of the basic tools for repairing LED TVs, very good luck in this new field of electronics in which friend starts, greetings