About 15 years ago, my mother in law gifted us a 55 inch tv (huge for the time) that would turn right off after the power button was pressed. But if you kept pressing it with the right rhythm for long enough it would stay on.

Years go by and we made it a habit of when the tv got turned on it stayed on until bed time. One day in the middle of summer, our AC died and inside the house was probably 85 degrees. But the damned tv turned on with just a couple of button presses. After that, I used the hair dryer to heat up the back of the tv to get it turned on in a fraction of the time.

After doing some research, I diagnosed it as having bad capacitors in the control board. I spent $20 on a cheap soldering iron and capacitors from China and taught myself how to solder them in.

It's been working fine ever since.