That's pretty infuriating. I have look for your model online, and apparently Toshiba decided it was reasonable to use a LED lamp instead, and they didn't make them good.

If you're used to disassembly appliances to repair them it isn't difficult to change it to a new one, or even change it to a common bulb + socket system. You shouldn't have too much danger doing that, after disconnecting it for a couple of hours, because the high voltage lines (red stranded wires) are far from that part.