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What is causing the led voltage to drop on my tv?

What is causing the led voltage to drop on my tv?

the top half of my 50” led vizio tv is dimmer than the bottom half sometimes. I took apart the tv and found that 3 of the led strips were not working. When I turned on the tv for the first couple of seconds all of the leds work. However after a while the 3 leds i mentioned before turn off so that only half of the tv works. I measured the voltages and my LED1 pins showed that when i turn on the tv, it reads 100v but then suddenly drops to 0v. I think that it means it is a power board issue but i cant find anything on the board that looks damaged. Does anyone know what can cause the LED1 voltage to suddenly drop to 0v on the power board?

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