1. https://www.google.com/search?q=Tutorial+on+LED+Backlight+installation+for+Vizio+M601%2CM801da3+or+M701d-A3.&ie=utf-8&oe=utf-8
2. From that list, a youtube.
https://www.youtube.com/watch?v=NI9wOZKHOVE
If you need something less generic, find and buy the service manual.
Where can I find a Tutorial on LED Backlight installation for Vizio M601,M801da3 or M701d-A3. 60 inch TV.

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