I have a freeview build into my tv which is Panasonic plasms tv Model no. TH-46PZ8BA and wish to know how I can receive HD channels BBC or ITV. Please advice and help.

Here is your manual.

https://currys-ssl.cdn.dixons.com/manuals/LOGIK%201TB%20Freeview%20HD%20TV%20Recorder%20L1HSTB12%20Manual.pdf

With the BBC Content you need to sign in with your account. You must also make sure you aren't using VPN and have a UK based IP Address.

TV Guide

Freeview https://www.freeview.co.uk > tv-guide
The biggest shows live and on demand all for free with Freeview Play. find out more · BBC ONE Lon. Series 23: 40. Devon and Dorset. Escape to the Country · BBC ...

Freeview

TVGuide https://www.tvguide.co.uk > mobile
TV Guide for all UK channels including Sky, Freeview, Virgin and Netflix. See what's on TV now and next and search for your favourite shows.

Freeview Channel Guide

tvchannelguide.co.uk https://www.tvchannelguide.co.uk > freeview
Freeview Channel Guide · 1 - BBC One · 2 - BBC Two · 3 - ITV · 4 - Channel 4 · 5 - Channel 5 · 6 - ITV2 · 7 - Regional TV · 8 - Regional TV

TV Guide & Listings

Radio Times https://www.radiotimes.com > tv-listings
TV Guide and Listings for all UK TV channels; BBC, ITV, Channel 4, Freeview, Sky, Virgin Media and more. Find out what's on TV tonight here.

What you need to do is retune the TV, but when it is finished look at the regional settings. Or if the regional option is available before retuning, retune selecting your area so then you get normal BBC channels. It's likely that at the moment the channels for BBC are located at the very top end of the channel list say? - channel 800+.

You are clearly picking up signals from many transmitters. With regional settings you can change it to the area you live in.
But you will have to take into account how good your aerial is. Otherwise the signal quality will not be good on same transmitters. So the set may only suggest those with the best quality signals.
ITV stations might also change.
When done it will move the channels you mention to the top end of the guide, to 800+.

Note many HD channels have no regional options. For example here in Yorkshire we only get ITV Granada and not Yorkshire TV on the HD channel for ITV1. And BBC1HD does not show any programmes when local news comes on.

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Freeview Help: Missing Freeview Channels - Radio and Telly

Sounds like you haven't retuned the set correctly. Use the factory settings/ default setting if poss. Look out for too much signal if you are on a booster.

Hi.

If you are using an external freeview box you need an HD box (See available products).

If you have an LCD TV with built-in HD tuner (TV will say HD Ready and will have internal tuner), then you can use the TV internal tuner.

The best way to get HD is via satellite. Althought HD Freeview is theoretically available since end 2009 I have not been able to receive any HD channel using Freeview tuner, and I live in a London area where HD FV is supposed to be available since 2010.
Even with Free Sat the choice is poor. You get steadily only BBC HD, where at most you can watch some documentary or drama series (it is a kind of sample channel). ITV HD, BBC1 HD and the rest frequencies on Astra change Sat quite often. I am a TV technician and the sat tuning job is not difficult to me but retuning every month was still an awful waste of time.At the end I gave up and I only watch HD through Sky.

At the end of the day the only efficient way to receive HD TV is still through Virgin or Sky.

Regards.

Ginko

It maybe that the TV needs to be completely reset. in the menu somewhere should be a setting to "restore factory settings" or "reset to default" something like that...

Try this and post the results...

both of those channels are in anolog, so on todays tvs they are going to look that way, sorry , something you have to live with if the cable company puts them on a digital channel they will look better but not HD quality

I have run into this problem a couple of times, once a loose connection at the LNB, other times it has been due to moisture build up (dew) in the loose connections, check all connections from the LNB through the tuner, and any other devices involved (a line map maybe?) that will most likely resolve the problem.

I've got exaclty the same problem :-/
HELP!