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I had this same problem with my Mitsubishi it is when you have fast on mode set it pre warms the bulb to much. I turneed it off and now the bulb has lasted much longer
Setting the Power-On Mode feature
You can select either Power-Saving or Fast mode.
If you select Power-Saving mode and you turn off the TV, it
can take several seconds for the picture to appear when you turn
on the TV again. Power-Saving mode saves more power than
Fast mode. See "Specifications" on page 66 for details.
If you select Fast mode and the TV is turned off, the TV will
stay in Standby mode for several minutes (see Note below). If
the TV is turned on from Standby mode, the full picture
To set the Power-On Mode feature:
1 Press Y and open the Setup menu.
2 Highlight Power-On Mode and press c.
3 Press b or B to select either Fast or Power-Saving and
Note: If Power-On Mode is set to Fast and you turn off the TV,
the following will occur for a few minutes:
• The screen (lamp) lights dimly; and
• The fans continue to run.
This is a function of the Power-On Fast Shutdown mode and is
not a TV malfunction. If you do not prefer this, set the PowerOn Mode feature to Power-Saving.
When the Power-On Mode feature is set to Power-Saving, if
you repeatedly turn the TV on and off in a short period of time,
the useful service life of the lamp may be shorter than the
average useful service life (- page 63).
this is from your manual not my Mitsubishi
please rate this answer if you felt it was useful.
Your TV has two poweroff functionalities. First power off button is on saver mode least displaying any transmitter programs. Using the remote control to power off the device achieves screen saver poweroff mode. Second manually pressing on the power button after power saver mode has been achieved with the remote control device should shut down the TV tube entirely. The blue light should not display in whihc instance. Howerever, a full power off mode is incapable of being controlled by the remote control device whenver poweron is required later. The TV power shut down button has to be pressed again to alow for current circulation once more. Powering off the TV with the button on the set requiries momentary duration waits whenever to achieve display of signals depending on the size of the TV, and how many pheriperal device connnections are attahced to it.
refer to the TV user manual for possible diagnostic to any persistant conditions.