Hm Code 12 is "no error". Which is odd since you have an error.
However, since the age of the TV is around 7 years, you may have the problem that the power supply is known for. The capacitors in the power supply fail.
To be safe, check the lamp and make sure its in good order. May want to change it anyway if its more than a year or 2.
SOURCE: red lamp light with newbulb, won't come on error code 34
There are two 1000uf 16V capacitors on the PWB that cause that problem code 34 lamp abnormality. If you need more info let me know.
SOURCE: WD-52525 Red lamp Indicator
usually with that model when you get a 34 eror code for lamp abnormality, its directly related to the capacitors on the Power Pwb. You can get the V26 Power PWB repair kit at the following link which repairs that issue. It contains the replacement High temp capacitors with the board location numbers and PWB identification as well as the service manual on CD. Heres the link its under their repair kit ctegory.
http://servicemanuals.vstore.ca/
SOURCE: I have a mitsubishi WD-52527 TV with error code 45
You have to pull the light engine to get to the pbs fan it is the one located closest to the lense on the light engine. you should be able to see if the fan is turning without removing the engine.
SOURCE: I have a Mitsubishi WD-52725 projection TV .I
the computer in your tv is bad, but someone can fix your problem , just need replace capacitors 1000 to 16 v
SOURCE: WD-65734 Mitsubishi TV won't turn on. System reset
Are there any lights lit on the front of the TV? Have you checked for a bad lamp? When you reset the TV the timer/power light should flash on and off rapidly for 60-70 sseconds. Does that happen?
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