I have an HL- t50756 and it turns off every 10 minutes

Try to reset the lamp timer. To do this get the remote first shut off the TV. Then on the TV remote (not cable remote ect) press MUTE
then punch in the numbers 182 then POWER in that order, wait when the TV starts up the Factory meneu will appear go to Options press, then look for Lamp Hrs. to see how many hours you have on your lamp TV lamps last appox 2 years average use. 4,000 hrs. Try this, above where you see the hours go to reset or something like that and press to reset blub timer to zero. Your blub might still be ok, but the timer says times up and tries to shut off the TV thinking the blub is bad. By reseting the blub timer to zero the TV will think it's a new lamp. Until it really goes then no picture at all or gets very dark. Try this trick it might solve your problem.

Good Luck!