To Repair a LCD TV

Unless you've got an ESR (Equivalent Series Resistance) meter to test them, do not use electrolytics that have already been used. Electrolytic capacitors are the single most common point of failure in electronics, and even if the device still works it doesn't guarantee that the electrolytics are good or not close to failing.

Buy new ones online from any reliable electronic component vendor such as those listed above. Make sure to match both the voltage and the capacitance values match (for the voltage, make sure that it matches or exceeds the number on the original; for the capacitance, match it as exactly as you can, and keep an eye on tolerance values (the % value beside the capacitance figure)), go for high-temperature ones if you can to increase potential lifespan, make absolutely sure you've got the polarity right (electrolytics can explode/turn into a missile if they get fed more than about 1.5v in reverse bias...).

Hope that helps,
Gadget