Facing TV Problems? Ask a TV Technician.
Hi, I'm Nathan.Sorry to hear that you're having trouble, but I'll do my best to help you. Please give me a few moments to review and reply.
Yes, that firestick is certainly compatible with that tv,
what you'd do is plug it into any hdmi port (hdmi1, 2, 3, etc). The stick also has to connect to the included power cord and electrical plug that came with it.
Then take the lg remote, press the Source (input) button, repeatedly, to get to the corresponding input mode where you connected the stick. From there wait for the fire logo to show on screen then press the Home button on the fire remote, and use the fire remote to follow the setup prompts of connecting to wifi and registering to your amazon account.