Canon t3i screen problem-not turning on

[SilviuRulz]

Hi! I have a canon t3i (600D). The screen is not turning on unless the camera is connected to a monitor via a HDMI cable, even though the monitor is turned off. I have to say that i see through the viewfinder informations like ISO and more. I don't think that the problem is a clip. I saw a video where the battery door is problematic. That guy gets a grip, puts it on and the screen turns on. I wouldn't invest in a grip unless i know for sure that this is the answer to my problem. Here you have some footage of the camera.(sorry for the **bleep**ty music)
https://youtu.be/xcInHNzs2Ok

[Waddizzle]

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@SilviuRulz wrote:
Hi! I have a canon t3i (600D). The screen is not turning on unless the camera is connected to a monitor via a HDMI cable, even though the monitor is turned off. I have to say that i see through the viewfinder informations like ISO and more. I don't think that the problem is a clip. I saw a video where the battery door is problematic. That guy gets a grip, puts it on and the screen turns on. I wouldn't invest in a grip unless i know for sure that this is the answer to my problem. Here you have some footage of the camera.(sorry for the **bleep**ty music)
https://youtu.be/xcInHNzs2Ok

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Make sure the rubber thing-a-ma-bob on the viewfinder is fully seated.

[SilviuRulz]

i cleaned that thing around the viewfinder, took off the rubber thing and put it on again just to fit tightly but nothing helps

[Waddizzle]

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@SilviuRulz wrote:

i cleaned that thing around the viewfinder, took off the rubber thing and put it on again just to fit tightly but nothing helps

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How did you clean it?  Did you clean it before or after the problems with the screen began?

There is a small sensor associated with the rubber eyecup that blanks the screen when you hold the camera up to your eye.  I assume that you already know about sensor because you seem to have read the old thread on the subject and posted on it.

[SilviuRulz]

cleaned it after the problem
i can t see any sensor on the viewfinder on the t3i