A3 8P Sony head unit help needed

wornclutch

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Hi,

I have an A3 8P pre facelift that had a sony cd player head unit installed by the previous owner. The head unit suddenly stopped working. Eject button on the head unit still works but other than that there is no sign of life. I checked the fuse 19 in the engine bay and the 10 amp fuse at the back of the hu. Both are working. What else could i check to resolve the problem?