I've followed the instructions here: http://www.scribd.com/doc/40256222/Mitsubishi-WD-62725
I replaced the lamp in my TV like in the past, but this time it didn't fix the problem. I got error code 34, lamp abnormality. So I checked the voltage to the ballast board according to the manual and it was 330v. The repair manual says 340 and that's close enough. That should mean the problem is in the ballast board and not the power supply. So I got a new ballast board and replaced it. The lamp light still come on and sometimes I get error code 12, which means nothing is wrong, or I get the previous error code 34, which means lamp abnormality. I'm stuck! According to the manual replacing the ballast board should have fixed it the problem.