My biggest blunder so far with my 5D:
Somehow, an oily deposit of some kind got spilled onto my eye cup and wasn't thoroughly cleaned off and I didn't know about it. It was probably at my daughters wedding, I was letting anyone that wanted to borrow it use it and frankly, I got some of the best shots of the night that way.
Anyway, the oily mess was wiped off of the external surfaces but left underneath it long enough to work it's way into the case and eventually into the LCD. Not just inside the cover, but inside the actual LCD screen itself. It works, but the screen is unevenly lit from top to bottom and it has a pattern that looks almost like a water deposit across the whole screen that stays constant from image to image, on the menu screens and even when I zoom in. I am 100% sure it is not a sensor or lens problem.
Today I pulled it all down and had the actual LCD unit loose from the camera in my hand. I cleaned it carefully and made sure the contacts on it's wiring plug in were all clean and oil free, but I Knew I wasn't doing much because I couldn't get inside the actual unit without some bending of tabs and prying apart and then some scrubbing on the actual light emitters (that didn't seem like a high probability of success operation, but I might try it anyway when I have a new one to replace it and nothing to lose).
Anyway, I put it all back together and everything is same-same. Now that I know there isn't any more oil in there, I feal better about it and it is useable as is. I generally just use the LCD for the histogram and to check the available memory anyway, culling if I am running out of space and I know some shots are trash, not much more.
My question- Does anyone have a source for genuine replacement parts? I will be calling around looking tomorrow, but the experience available on this forum would be a great help in steering me to a trusted source if there is one- Anyone?