I have the same problem , but i had my for about 10 years.

If the standby button on your Sinotec STL-32VN23 TV isn't functioning, and the red light remains on without changing to blue, it could indicate a power-related issue or a problem with the standby button itself. Here's how to troubleshoot:Confirm the TV is receiving power from a working power source.If available, try using the TV's remote control to turn it on.If the issue persists, unplug the TV from the power source for a few minutes, then plug it back in and attempt to use the standby button again.If the problem still exists, it may be due to a technical fault in the TV's power circuit or with the standby button. In this case, it's advisable to contact a professional technician or the manufacturer's customer support for further diagnostics and potential repairs.

possible reasons, its in standby, hold in the proper ON button on the tv for up to 20 seconds gently. or try disconnect power(pull plug out) wait 10 seconds, plug back in and turn on using the actual button(holding for up to 20 seconds) NOT THE REMOTE if that does not work, make sure your INPUT is CORRECTLY selected eg you are viewing HDMI1 and NOT HDMI2 for example. there may be different procedures for flashing lights

um u should turn your tv off for like 10 minutes , i think yourr tv is a internet tv so let it cool sometimes sony internet tvs freeze with black screen so try it out.
good luck :)

No, someone will need to open set and check voltages etc and also look at power board to see if any puffed up bad caps like these:

power supply board is damaged,only working with standby power

The only solution at this point would be to get the power supply repair since new boards are not longer being manufactured. In about 95% of the time if the LCD doesn't power up or turns OFF by itself or need to be unplug for some time to make work again; those are the symptoms of a dying or defective power supply.
I service these power supplies, for more info write to [email protected]

I am having the same problem my tv will not turn on all of the sudden, standby light flashing, cnnot get it to do anything

try unplugging for the power source for 60 seconds hold in the power for 10 seconds then plug the power cord while you are hold int power button in then release the power button... now try it (turn it on)