Hi @annanguyen60077,
What is the model number of the TV?
When the TV screen turns black but with the audio still being heard, try shining a flashlight at an angle close to the screen and check if you can see images at all.
If you can then there's a backlight problem i.e. the backlight LEDs are being turned off for some reason, faulty power board or mainboard perhaps.
Not sure if this will work as I don't know the model number, but disconnect the power to the TV and then remove the back cover from the TV.
Disconnect the mainboard - power board cable at the power board end.
Reconnect the power to the TV and turn it on.
The screen backlight lights should turn full on and stay on.
There will be no images or audio as the mainboard has been disconnected.
Be safety aware as there is exposed lethal AC voltage on the power board so turn off the TV and disconnect the power before touching anything in the back of the TV.
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Same exact issue was this ever resolved ?
par Acc