32 inch hd lcd lg tv works but slight fault 1 pound to fix .

lg model g 32lc46 works for around 20 min then screen goes funny its needing a capasitor changed to fix turn it of and on again its ok part cost 1 pound but i dont no how to do it seen it on youtube can be done fast very nice tv in good condition exept minor fault works then goes of after 20 min