Help: LG 32LD550 problem connecting to internet with wireless dongle
Check on your PC IPCONFIG /ALL and try to enter same data on your TV dongle with an diferent IP (to avoid IP conflict).
Because, mybe you WRT54G does not give DHCP adressess to wireless clients.
Check setup of router. Mybe upgrade it. Nice firmware for upgrading is
dd-wrt - stick to the upgrade procedure. If you are not sure how to upgrade, beter dont do it.
But if it works with manual setup of the dongle, it is also ok.
Hope it helps. K2