lost cherry?

I think we've lost this cherry tree sadly.  No sign of buds opening out and there's a dry, brittle feeling to the branch tips.  I don't think nutrients are being transported or they're getting blocked.  There's quite a bit of lichen on it, but that shouldn't hurt it.  It's probably a fungal infestation of some sort, I'm not sure.  I suppose it might have got water logged this winter or maybe the soil pH is out of whack, I haven't tested that. I just don't know. :-(