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A few things you should check before trying to open it.
The batteries.
Corroded battery contacts.
Look for the IR light from it (from the top edge) when you push a button by looking at it using a digital camera. You should be a light that may pulsate a bit.
Sometimes the buttons wear out on this type of construction (conductive flexible membrane). Try different buttons. There is no good fix for bad buttons.
There are not many replaceable parts in a remote control.
It might be better to replace it with one of the universal remotes sold now.
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