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It sounds like you may have a problem with the video signal on your Vizio 55 inch flat screen TV. The fact that the TV turns on and has sound, but no video and vertical lines on the screen, suggests that there may be an issue with the video processing or display.
It could be a problem with the T-CON board, which is responsible for the video signal processing. It could also be a problem with the LCD panel itself.
It's also possible that there's an issue with the cable connecting the T-CON board to the LCD panel, or a problem with the software on the main board.
I recommend consulting the manual of the TV or contacting the manufacturer for further assistance. A professional technician should be able to diagnose and fix the problem.
It's also possible that the issue is with the mainboard or the T-CON board is not compatible with the TV. Thus, it's best to check the compatibility of the parts with the TV before installing it.
1. Disconnect the cable between the main power supply & main board, supply AC to the TV, if the LED strips are OK, it should light UP, if not replaced all of the LED strips.
2. If the back lights light up, but no display or sound, replaced the main board.(after you re-connect cable).
Look at the T-Con board. It is located in the center of the TV. It has two wide flat ribbon cables going to the bottom of the screen. There may be a metal cover on it. The numbers on the board will identify it. Go here for parts: TV Parts Universal TV Stands DLP Chips ShopJimmy
Something else is going on. The T-Con board has no other function than controlling the picture. If there is a separate board for the led drivers, I'd suspect that one. The main board controls the sound.
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