Hi @ VOLT KRIS,
Unplug the power cord from the TV and then disconnect the cable that connects the power board to the mainboard, reconnect the power cord to the TV and switch on the TV and check that the backlights turn on in the screen.
If not there may be a problem with the backlights that is preventing the TV from starting.
If they do turn on OK , switch off the power to the Tv and disconnect the power cord from the TV, reconnect the mainboard to the power board and near the connector where the cable from the mainboard connects to the power board you should find printed on the power board the voltage values for the different wires going to the mainboard.
Reconnect the power to the TV, turn it on and measure the voltages at the connector.
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SAFETY WARNING
Familiarize yourself again with how to use the multimeter before you begin.
Be safety aware when you start to measure voltages as even though you are measuring DC voltages there is still exposed lethal AC voltage available on the power board - stay focused on what you're doing and where you're doing it!
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dang any suggestions where to start. I have a multimeter but havent messed with that in a while
par VOLT KRIS