Pioneer Rear Projection TV SD-P50A-K repair assistance

Unit will not turn on, only Standby red light is on. Fuse106 (4A 250V) was blown. Replaced fuse, worked for 2 days and now the TV is dead again. This time Fuse106 is ok, but something else has broken.

Help from anyone to identify root cause of blown Fuse106 is very much appreciated.