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Unfortunately, this model Vizio set has a lot of issues with the backlights. I believe I've posted this before but going to again, before you buy a Vizio TV check the model number, if it starts with an "E" keep shopping, the E stands for economy series and in most cases the sets only last a yr or 2. I'd be suspicious of inverter issues, the defective lamps damage the power board inverter, start by testing C203 and C204, you should see the same voltage on both caps. If one has no or very little voltage you need a replacement power board. If the voltage is close to the same (one will be a little lower as it has the lights that work on it), I'd lean towards a connector issue, this set has 4 individual regulated supplies for the backlights, they're fed from 2 inverter rails, it appears one rail is working and the other not, this points me in the power supply issue.
Double check the flat ribbon connectors going from the panel boards to be sure they're all connected correctly, if they are the panel was damaged when it was handled, or from static, if grounding bands aren't worn it's quite easy to damage it from static.
Back - light problem. Check and replace damaged component/s at its back-light inverter board, or replace this board as card basis. If you wish to get some details; check the site linked here. Pull up older posts or search the site by type in the brand name of your set, at its search box at the right column.. It will be best to replace the inverter board as card basis. http://electronicshelponline.blogspot.com/ https://elektrotricks.blogspot.com/
Check your ribbon keyboard connector and make sure it is lined up properly. Sometimes it sets crooked and will not connect properly. If that dont work check your t con board.
supply board is not the problem,you have to check the led strips on the back side of the screen ,be carefull not to crack the fine glass screen,and check inverter voltage connected to led strips.
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