Part Number STK392-110 for Toshiba....
Just changed the part in a big screen tv not even 10 hours ago and it took a whole hour at the most. TV model number TP55G90 had a power problem that caused the power LED to blink slowly with no picture. I purchased the part for $25.69 and with shipping, the total was $33.64 from Vance Baldwin Electronics (part number 23905094 IC, Hybrid). Very fast delivery.. www.vancebaldwin.com (<-PLUG :-).. NOW, the kicker was that when I pulled the board (smaller power supply PCB on the left), I found that there was 2 identical parts on the board. 1 labeled (H)orizontal, and 1 labeled (V)ertical. 50/50 chance of replacing it in one shot.....:-) I replaced the H side (left side if the board is still in place and heatsink towards you) and works like a charm. The owner was very happy and in under an hour.