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Hi there, sorry to hear you're having trouble with the Samsung,
is the picture dim enough that it is difficult or unpleasant to watch? Or is it passable, but you just want it to be brighter because it's in sunny room?
If the menu adjustments for bright, contrast, etc make no difference, and the overall picture including menus is very dim, that would tend to indicate an internal hardware failure. Specifically, this would likely be a problem with the Z sustain board, which is the component that controls the intensity (brightness) of the display.
As this is something that would require repairs to correct, you'll have some decisions to make regarding repair vs replacement.
If it is something you're looking to do yourself, and are capable of doing some diagnostic testing with a multimeter, and replacing the part in question yourself, you can get this done for under $200 usually. I'm seeing the zsus board going for around $180 on average. If you would want to have a tech do the job, figure double the price to factor in labor costs. In either case, you may not consider this a practical investment for a 5 year old 720p set. If you prefer to replace it, you can typically find a comparable (upgraded, in fact, to 1080p, 3d, smart functions, etc) in the $500-800 range.
If you'd like some help with part numbers, finding a local shop, or replacement recommendations, just let me know.Nathan