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Smart TV Samsung un55ru7100 does not turn on and the red light in front flashes. The backlight flashes similar to a failure of the LEDs and it is necessary to make sure that they are ok to be able to continue with the analysis of the electronic part, but the type of connector with very tiny female contacts does not facilitate the testing of these lamps, so you have to remove the power supply board and insert small pins to make the contacts. Once the LEDs are tested we concentrate on the power supply where we found the fault. Finally we lower the heating of the LEDs and the power supply board by lowering the backlight intensity.