Did you have a power surge? Any number of things can cause a dead set. You know that the AV-48WP30 is prone to convergence problems. Could be that either of the Convergence Out IC's shorted and caused problems in the power supply. Read the following, it might help. Replaced Cp943 Open, Icp-N20-Y Q953 Short, 2sc3311a/Qr/-T D918 Short, Mtzj5.1b-T2 Ic911 Short, Str-F6629b/F7 Ic921 On Spec, Se140n Pc921 On Spec, Pc123f2 D958 Leaky, Mtzj6.8c-T2 More Info: Original Symptom Was When Power Pressed, The Power Supply Relay Clicked On And The Blue Power Led Came On And Stayed On Steady, But No Other Response. After Awhile The Set Would Shutoff (Not Shutdown), By Itself. Or It Could Be Turned Off If The Power Button Was Held Down Until The Led Went Off, 10 To 20 Seconds Later. The B+ Relay Never Clicked On Or Off. Originally Found And Replaced Open Cp943, Q953, D918, Ic911, And Ic921 (Pc921 On B.O.). The Symptom Changed To Turn On With Power Button, Power Supply Relay Clicked On And The Blue Led Came On With The Power Supply Ticking, And Within 10 To 20 Seconds The Set Went Into Shutdown With The Blue Led Blinking On 1 Second Off 1 Second Repeat, Which Troubleshooting Indicates Is A B1 Over-Current Protect. Note That B1 Is How It Is Shown In The Manual. I Do Not Know If It Is A Typo And Should Say B+, Or If B1 Is A Designation Jvc Uses. Also Note That The Blue Led Was Never Really Off, It Blinked Bright/Dim, Not On/Off. The B+ Relay Again Did Not Click On Or Off, Only The Power Relay. Pc921 Finally Came In And Still Had Same Symptom, Which Is When I Replaced D958. It Tested Good But Must Be Breaking Down In Circuit. Clue Was Voltages On Q953 (And Elsewhere) Were Jumping Up And Down While Set Was Ticking. Good Luck, Eric