Iphone 4 LCD backlight problem

hello!

dropped iphone 4 , pretty drunk dont remember dropped it, if got water or on ground. anyway, glass got broken , backlight weak, lights correctly @ "pixels" of screen, stays pretty dark on others. it's enough can see screen if have sunlight avaible. wonder if replace lcd? or wrong?

have replaced screen before because of broken screen, wont problem again, dont want buy screen if aint problem.

help!

 

well, if glass broken, replacing not nothing?

 

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