John Skinner Offline Upload & Sell: Off
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It's not really a matter of diagrams or hard fixes here. Inside these bodies are very few actual electronic components. Each of them are 'plug-n-play' type boards. Be that an LED array, or Expeed3/4 main boards, shutter assemblies, sensors etc.
You will notice (depending on how your settings are) there is an adjustment inside the menu system for the 'brightness' of this lower viewfinder output. That is you can adjust it to read (eg) High/Med/Low. And it will fluctuate when the camera is pointed between brighter and darker light sources. If your actual exposures are having a bad time. This could indicate the exposure....and hand in hand.. the LED light reading portion is faulty.
If it's JUST the info array. That's either the input of voltage to it. Or, the ribbon cable that feeds this array is not seated in it's electrical contact seat. All of this I more or less said above. I have replaced main Expeed boards and some of the chimping LCD's on the backs of the Nikons due to impact damage (I can't believe I just said impact damage ) so when you have to tear em down.. You have to put it all back together in the end. These are just some of the little gems I've picked up after doing 30 or 40 bodies... Rubber replacements, viewfinders, dioptic adjusters etc.
Good luck with your issue.
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