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It sounds like your Vizio TV may have a backlight issue, which can be caused by a problem with the LED strips or the backlight driver board.
To determine the cause of the problem, you will need to perform some troubleshooting. Here are a few steps you can try:
Make sure that all of the connections between the TV and the wall outlet are secure.
Check the TV's backlight setting and make sure it is set to the optimal level for your viewing environment.
If the TV has a local dimming feature, try turning it off to see if it makes a difference.
Check the TV's picture settings and make sure they are optimized for your viewing environment.
If these steps don't fix the problem, you may need to replace either the LED strips or the backlight driver board. To determine which component is faulty, you will need to perform some further troubleshooting or seek the assistance of a professional.
You were lucky, only 99% of people here get a satisfactory results trying to repair their own televisions, even partially as you have.
The most likely cause is a bad connection on a ribbon cable or a dry joint on that board that you tapped. Try reseating the ribbon cables first. If that doesn't work, remove the boards and on the soldered side, look for gaps where the components meet the solder.
Replacing the backlight LED strips requires stripping the TV down, taking the LCD display out and taking the display apart to access the backlight LED strips. This a difficult thing to do without damaging the display or other parts of the TV.
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