You need to check for this part, but you probably can just change the I/R on the board, as it's already mostly dead, it's not of much risks at this point.

Here is one, expensive, but you probably can find if you ask on the Sat Italian Forums, as there is for sure few DM800HD around for parts.

Part to ask for : http://www.ebay.it/itm/Ersatz-LCD-Oled-Display-fur-DM800-se-/331788535153

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