I have this same tv. There are 2 led series wires going to the small connectors with the white,red and black,red wires. One set of wires for the top of panel, one bottom of panel. The outermost pins on the 2 connectors provide the voltage while the 2 inner jumper the led series together.

Probe the 2 outer pins with a multimeter on DC volts. You should see over 200 volts if the led driver is working. This means an led blew and created an open circuit.

Optional... You can short the pins on either connector while hot and figure out which connector of leds is bad... The...