No Picture on my Sony KP-53HS10

The set might have lost the high voltage needed to light up the picture tubes,the easiest thing to check is for a loose conection in the horizontal drive transformer first ,the power supply and the output transformer area,you can try to find it by removing the back cover ,repluging the set,turn it on and with a wooden or rubber handle tap in different areas of the chassis to see if it reacts,you might have to keep pressing the power button while you are trying.If you are familiar with tv service you have a few places to check,some resoldering might be needed,you might need to check the output transistor for a short ,if the transistor went bad it did take a fuse or safety resistor.If you are not too familiar I would suggest to call for help from a servicer,I dont think is time for a new set just yet but an estimate will help you decide.Let us know how it goes or if you need more information.