Replacement service of CPU board. Use this product if the clock is not working or if the Beomaster loose settings. Note that the clock in Beomaster 5500 is standing still during mains power failure by design. Send to the board to us and we will return a fully working CPU board. Please choose your beomaster since the boards differ between the models. Note the position of the two contacts on the board before removing it since putting them in wrong position will severely damage the board.