Hello Im having trouble with this TV wont stay on turns on for about 2 seconds shows vizio logo then turns off the standby white light fades away shortly after I have replaced the main board 2x (used) with the issue still remaining i even changed the supply board still have the exact same issue i have cleaned around the power button making sure it wasnt stuck is there another component i need to check or test? any help would be appreciated attached are the main and supply boards.....

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Hello, My name is David and im here hoping to learn as much as i can and fix my TV of course with the help of your knowledge thanks!