Hi @murugappan mpm,
If it is not a Samsung LCD TV please confirm the make and model number of the TV?
If it is a Samsung LCD TV, try the following:
Turn off the TV.
Disconnect the power from the TV
Remove the back cover from TV
Disconnect the cable between the mainboard and the power board.
Reconnect power to TV and switch on the TV.
The TV screen LED backlights should turn full on and stay on. There will be no picture because the mainboard is disconnected.
If there are no backlights and you are measuring 300V DC at the LED power cable connector on the power board, with the LED power cable connected, then there is a problem with the LED backlight circuit somewhere between the power board connector and or in the LED array.
With the TV boards all connected properly, can you turn on the TV and do you get audio and can you see images on the screen if you shine a torch at an angle close to the screen? They will be very faint if they are there if the backlights aren’t working
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