Location

Look for the horizontal output ("flyback") transformer, which has a red lead coming from it to a connection cap at the top of the picture tube. The horizontal section is that portion of the board. (There are other horizontal circuit parts on other areas, but most of the ones prone to failure are in the area of the flyback.)

Electrolytic capacitors have three important markings: the value (in microfarads, usually abbreviated MF or uF), a voltage rating, and a polarity (some brands mark the positive lead and others the negative, but there will be a polarity shown). If you replace a capacitor, stay with the same capacitance value, but consider a slightly higher voltage rating (but never lower). The replacement will be a little larger but likely would still fit, and under-rating is what causes most failures in the first place. Be sure to get the polarity correct when installing the new part.

Be careful working on your TV. Capacitors and the picture tube can store charges that can shock you even after the set's been off for a while.