Unit won't power up from standby mode

Connect the power cord to the power socket after you have completed all the physical connections. At this stage, the TV will enter Standby Mode and LED indicator is white. In Standby Mode, press the button on the main unit or on the remote control to turn the TV on.
https://elementelectronics.com/wp-content/uploads/2019/07/Smart-TV-User-Manual.pdf

hi Shaun.
How do I get my TV out of standby mode? Press the power button once. If the TV does not turn on, observe the LED indicator, usually located on the TV's lower front panel. If the LED indicator turned off after you pressed the power button once, it is in standby mode. Press the power button once again to exit standby and turn on the TV.31 Mar 2015

How to Troubleshoot a TV in Standby ' Techwalla.com

https://www.techwalla.com/articles/how-to-troubleshoot-a-tv-in-standby Search for: How do I get my TV out of standby mode?

How do stop tv going on standby Google Search

My sisters e-motion lcd tv is locked in, standby mode. I think that replacing the psu (power supply unit) is the answer. but be careful of introducing static damage to the components as you can cause latent component damage and then future repair is not so easy to locate! always make sure that you fault find using the proses of elimination ie start from the begining !! Make sure you have a 240v supply going in and then probe for your outputs.. If your out put measurements are ok then you can eliminate your power supply unit as your problem circuit .....

check for defective regulator at the power supply section and shorted horizontal section. if you don't have an idea how to trouble shot this unit i suggest to leave it to a trained tv repairman to fix the problem. atleast you have an idea what to expect when you hire somebody to do the job good luck.

Visit this site for details. All information about this type of fault [2 blinks of standby light to sony Trinitron]; are described here in detail.
"Electro-help", is the name of the site.
Search for it on Google.

Two blinks - B+ over current protection (OCP), unit goes to the standby mode then displays the 2 blink fault. Could be a short in the power supply of any of the circuits.

Powering up do you hear the relay click then you may see the display flash (not necessarily), but then the TV clicks back into standby mode. If so there is a component failure.
will need diagnosis by a repair shop. Too many different components it could be for me to guess. but
the common repair kit containes1 fuse (F302), 1 diode (D304), the power resistors (R927 and R929 for the board revisions with these two resistors) and the IC301 voltage regulator IC.

Usually Sony and LG Blinking Codes are the same. Here is what I have.

• Unit is dead, No blinks - Problem in the standby power section. Might check fuse,
  
• Continuous blink once a second, no pausing - No reply from the jungle IC301 (data bus is busy, shorted to ground, or held high), IK video path is defective.
  
• One blink - not used for the self-diagnosis
  
• Two blinks - B+ over current protection (OCP), unit goes to the standby mode then displays the 2 blink fault. Could be a short in the power supply of any of the circuits.
  
• Three blinks - B+ over voltage protection (OVP), unit goes to the standby mode then displays the 3 blink fault. This is also a problem in the power supply circuit,
• Four blinks - No vertical Deflection (V STOP), Screen goes to a single horizontal line then the video signal muted.
  
• Five blinks - AKB circuit (automatic kine bias), the timer/standby indicator blinks for about 30 seconds then goes to the self-diagnosis function. Something is wrong with the video. In addition, unit could be in IK blanking, try turning up screen slightly.
  
• Six blinks - No Horizontal (H STOP), no raster, goes to the blinking self-diagnosis function immediately.
  
• Seven blinks - High voltage shutdown. The high voltage has exceeded 33k and the unit goes immediately into safety shutdown. Check power supply regulation and horizontal circuits.
  

• Eight blinks - Problem with the audio (AUDIO), unit goes to standby and blinks the self-diagnosis code.

• Nine blinks - Panel Module Error or Thermal Error. If it is intermittent 9 blinks, meaning sometimes the TV comes on and other times you get flashing Make sure the regulator is -12 or -13 (negitive).

• Ten blinks - Check Q8014 and Q8013 for shorts, leakage, or bad solder connections on the " D" board. If the transistors are bad, check R8051 and IC8005, also on the "D" board.

this is a problem with the switch mode power supply unit,check for the components not functioning in this unit and replace