Pool members are not reachable from LTM after creating self IP and VLAN

There not a lot of information but I would start with some simple checks. First check the VLAN and make sure it is attached to the correct interface. Then check if you should be using VLAN tagging, finally check the subnet mask is correct on the self IP and the IP is not used anywhere else on the network.

You can check the VLAN issues with a simple TCPdump on the vlan itself if all the traffic you see is just f5 ARPing for the servers mac address then most likely the VLAN is setup incorrectly. If it is a virtual check your virtual switch and make sure the interface is on the correct VLAN.