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Contact any service technician. Its CRT base connector socket, or, LOT is faulty. This is not a user repairable fault. Replacement to any one among component stated above, or both, might need replacement. Gopakumar Gopalan Google
If CCFL lamps are weak, this might happen. Check the control voltage comes to backlight inverter board from the main board too. It should vary according to increase in brightness.
1. Lamp is nearing end of life and may dim just before total failure.
2. A few of these models have 2 mirrors(check with Mitsubishi to see if yours is one) A large mirror in back (never gives a problem and do not try to clean it. Some idiot in these sets used a small mirror inside that the optical unit shines the picture into (wedge shaped mirror and small) and it is facing up----the fans intake air from the front of the set around this mirror--it gets coated with lots of dust---Picture can loose up to 70% of its brightness and clarity if that mirror is dirty--looks like 20 year old set .
If you do not wish to check with Mitsubishi GOOGLE THE MODEL NUMBER with "mirrors" to see.
If it has 2 mirrors I can tell you exactly how to get at it.
I would need more information as to how fast the picture is getting darker. If it is happens over a matter of hours as you watch it the tv may have a lamp driver issue and requires service. If it has been getting darker over a period of months, you may need a new lamp.
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