Faded display the display is very dim and at time completely dark or off

Depends on the model. Have you checked the backlight, (LED in this set perhaps).

I guessing it may have auto brightness adjust since shinning light on it made it dim more. Is there settings accessible to disable it ? Or if you can figure out where the light sensor is, maybe covering that, if it doesn't also block readout.

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iFixitApr 15, 2011 - The display on my brother's MacBook Pro 17" 2.5 GHZ (early 2008) has begun to dim, but just on the left side, as though one column of lights ...

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You have the unit in dark mode. Press the Dim/Dark button again to get the unit to full brightness. THe unit has 3 levels of DIM. First the unit is at its full brightness, pressing the dim/dark button will dim the display and the unit functions normally. Press the Dim/Dark button again will futher darken the display but when the unit alarms the display is turned off and remain off during the alert. After the alert is over the unit waits 20 seconds of no alert to turn the display back on.

I believe this is most likely due to incorrect voltages at the display. If you have a meter and are familiar with working on electronics, check the voltage at pin 3 of cn501. It should be -28.5. If the voltage is very low, try changing C123 and C124 in the power supply. If the voltage is ok, check R925 and R932, these are both 10 ohm 1/8th watt.

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Yes, anytime the picture becomes dim, or the color begins to fade it is time to replace the lamp.

this thing happened in my laptop also i got green screen fully
then when i hit it behind the screen it was gone but comes many times then again i would hit
later on the screen was completly lost then had to replace the screen
yous is a starting period so go to a nearby computer service and fix the screen

Time to replace your DLP lamp!  Expensive ($200 and up)!  Good luck!

Have you tried Main Manu / Setup / Display and then adjusting the contrast?