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2006 iMac Backlight

is the backlight burning out something I have to worry about in a 20'' iMac from 2006?  the screen looks rather dim even at full brightness when you compare it to my LED backlighted 2017 iMac.  a friend just gave this to me and i don't want to lose its usefulness after just getting it.  were these not all that bright to begin with or do you think i might need to replace the screen?

 
Backlight burnout is somewhat uncommon for the C2D iMacs, it is just the CCFL backlight. They are only about 1/3 as bright as the new LED one's they put in the iMac today. Once you give it a few minutes to warm up though it should be comfortable to view at full brightness. I do not know too much about the replacement of the backlight for these models, but I'd make sure that the connector is secured inside the machine. 

 
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