Emerson ltdn42v68us red light always on. tv will not turn on

What's happening with your TV is the backlight inverter is sensing over current and shutting the entire power supply down (excluding the standby supply) this gives the 1 blink code. Reason for over current is open circuit in the LED backlights, you will need to replace the lamps to fix the issue, there is about a 2% chance of it being a faulty power supply but in most cases it's the lamps. This is common on most Funai brand sets.

Push the volume up and see if you see a voltage change at the connector from the buttons. if so replace the main

Already answered

Hello Patty,
To run a factory reset, locate the reset button on the connector panel. It's a small, recessed button that requires a pen to hold down. Hold it for 15 to 30 seconds to reset the television.
Alternatively, reset from your remote by locating the "Settings," "Advanced Settings" and "Factory Reset" option.
Click on this link below to see your TV manual.
Good luck,
JP
https://www.manualslib.com/manual/1215207/Emerson-Ltdn42v68us.html#manual

Contact the authorized dealer for Emerson. They can provide you the same. http://electronicshelponline.blogspot.com/

Universal remotes have loads of codes in the remote.to select the right one first select tv button then select the on button over and over again until the tv turns on. Thesis then the right code. Sometime it take 200 pushes of the power button to find the right make and model of the tv.

Check its main power supply regulator board for the fault. Replace it as card basis.

Something short with its I2C bus line. Contact any experienced service technician, as this fault is not a user repairable one.