First you should notice that not every android supports PIN. Go to web interface of the router, then click > WPS>Add a new device, then fill in the PIN number of the phone.

Some particular DHCP servers will ignore “unicast flag” in client DHCP requests, and broadcast all DHCP packets to respond to all client messages. Sometimes this will cause a compatibility issue. You...

Solid Orange means the signal is good, and TL-WA860RE is working already. flashing means that TL-WA860RE is trying to connect to the router. You have to wait a few minutes for the boot progress.

The Wifi hotspot Server always limits repeater product, I don't think you can repeat the Wi-Fi signal unless you can hack the Server to change the settings.

I think it is the wireless profile on your laptop caused this issue. Go to >Control Panel>Network and Internet>Manage Wireless Networks (on your laptop), try to delete the wireless profile.

Seems Samsung SmartTV has a compatibility issue with TP-LINK. Contact TP-LINK Support see if they have beta firmware to solve this issue.