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STM32F105RC to STM32F105VC PA4 DAC problem

Hi,
I am porting some code from the STM32F105RC board to the VC version of the board. It uses PA4 and DAC1 connected to an amplifier to output different frequency tones, using timer 7. I cannot however get anything out of PA4, do I need to change anything other than the board selection in the properties section? It worked fine on PA4 on the smaller chip.
Many thanks.