I’d say it’s highly likely that it’s an issue with the LED strips - suggest that you swap them all out - https://www.shopjimmy.com/vizio-ic-a-vzaa55d698a-b-replacement-led-backlight-strips-10-e55u-d0.htm
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I’d say it’s highly likely that it’s an issue with the LED strips - suggest that you swap them all out, you can buy a replacement set at - https://www.shopjimmy.com/vizio-ic-a-vzaa55d698a-b-replacement-led-backlight-strips-10-e55u-d0.htm
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Generic instructions to replace them can be found at - https://factory-reset.com/wiki/LCD_Backlight_Problems#How_To_Replace_LCD_LED_Strips - it’s quite a delicate process to remove the LCD so be sure to check out some video tutorials on YouTube to get an idea of the process.
I’d say it’s highly likely that it’s an issue with the LED strips - suggest that you swap them all out - https://www.shopjimmy.com/vizio-ic-a-vzaa55d698a-b-replacement-led-backlight-strips-10-e55u-d0.htm