tv stopped working..

[aidynphoenix]

ok i replaced the cap..
it still does the same thing..
ok there is a big heatsink near that cap has u4501 VERT engraved on it..
the black chip thinggy cliped onto it is labled. LA7831. than below that 51105 than below that.. 01a 0b4 (thats all on the chip)

im guessing that is the vertical IC>>??

should i just buy something labled la7831.. or can sombody find me a link to a site selling one?