TV Won't turn on, Has flashing red light.

https://community.sony.com/t5/Television-General/Red-light-blinks-6-times-tv-won-t-come-on/td-p/47107

What make and model TV?

you need a mainboard or powersupply

That means that its no good and needs to be replaced

tried to check first the power supply if no any sign of bulging electrolytic capacitor this was a common that we encountered trouble.

A possible bad lamp if not replaced recently or removed and at least examined. What is model number and what have you tried so far?

If the red light won't come on it is not getting power.First,try plugging it in to a different outlet,or unplug one of the gadgets you know is working and plug the tv in there.You are simply switching.If you know that there is power coming from the outlet and it still won't come on then you'll have to check the cord;don't go much farther than that without expert help.

Replace the lamp.

sometimes a leaky filter capacitor in the power supply primary section could caused this problem,or a loose solder connection in the power supply section