Toshiba Ballast Lamp power drive unit. Part no: RPB-4434ZA  23122468

This Ballast is suitable for following Toshiba models:
 
46WM48    52WM48   46WM48P   52WM48P
46HM84       46HM94      46HMX84
52HM84       52HM94      52HMX84
52HMX9      462HM8      462HM94
52HMX84    62HMX84
The function of this unit is to power up the lamp.
So, if this unit develops a fault the lamp will not power up.