Your c4106 is actually a 2SC4106, which is a 7 amp rated NPN switching
transistor in a T0220 package,with Vce rating of around 400v and a dissipation of 50watts.........
Equivalents are: 2SC4242 or MJE13007
more than likely if they have blown, then you may have damage to the secondary side mounted components like the rectifiers, worth a check.......
What generally happens is the transistors run in a start up mode, and unless the secondary supplies are established, are free running, at a frequency that is not their normal frequency. they become too hot and fail......The frequency of the supply is generated by a pwm controller usually something like a TL494, whose supply is generated from the secondary of the transformer......
Good luck reparing it..... 8)