When I installed my new tv tomorrow morning, everything worked fine. The tv found my 5GHZ Wi-Fi without any problem, when I had to restart my router because I changed a couple of settings, the TV couldn't find my 5GHZ network anymore. I factory resetted the tv, unplugged it for a few minutes, changed the SSID and I still could not find the network. It's a philips 43PUS7303/12 with android 7
Thanks guys! by lowering the Wi-Fi channel the tv was able to connect again
If it can see your neighbors router and not yours, then the problem is with your router. Try power cycling the router by unplugging it from the power for 1 minute. If that doesn't fix then try configuring the router to use a less congested frequency. There are apps like wi-fi analyzer (android) that allow you to see what frequencies are being flooded.
Try lowering the Wi-Fi channel, i think my 55pus6501 is limit to channel 1-13 on the 5ghz spectrum.
Edit: just looked it up and these are the channels Phillips TV's support 5.0 Ghz channels: 36, 40, 44, 48