I have a Sanyo TV model C28EH85-00;chassis EB2-A, which was only displaying a horizontal line so I replaced vertical deflection IC451 (LA7833) and capacitor C451(50V470uF). It worked fine for 1 day but when switched on the following day, it only worked for a few seconds before switching itself off to standby. What do you think is causing this problem? In what order should the suspected components be checked?

AJC, April 2010