Yes your Sony TV should be able to receive HD channels.
After doing a tune/ retune the HD channels should start at 101
with BBC One HD, 102 BBC 2 HD and so forth, have you had a look.
Are you performing an auto tune, if the TV aerial is receiving signals
from two or more transmitters this can cause some confusion for the TV tuning
function and lead to some channels being duplicated or missed, sometimes when
there is duplication the TV can put them in the 800's, have a look there.
If you manually tune your TV you can make sure that is receiving signals only from your
nearest transmitter. To find your nearest transmitter click on the link below,
https://www.freeview.co.uk/corporate/detailed-transmitter-information
Enter your postcode and house number, click check.
You will see a table of the Transmitters close to you, nearest first.
Lower down you will see another table with the nearest transmitters
information, multiplexes (muxes) etc.
A multiplex (mux) is a Channel which broadcasts several TV channels
at the same time, the mux channel number is under the N in the table.
For example from my transmitter mux 46 broadcasts all BBC standard definition
TV channels and BBC radio broadcasts, 25 in total.
Mux 47 broadcasts 35 different TV standard definition channels and radio broadcasts.
There are six different muxes broadcast by my nearest transmitter.
If you look close at the table you will see on the second row under the transmitters name
the multiplex name, BBC A, BBC B, D 3&4, etc.
BBC B is the mux that carries the HD broadcasts/ channels, not just BBC HD channels
but ITV HD, CH4 HD, CH5 HD and any others that may be broadcast in your area.
Take a note of all the muxes that broadcast from your nearest transmitter.
Go through your Sonys settings menu till you get to the manual tuning
section.
In turn enter each mux number and scan for the channels broadcast
on that mux, save them and move on to the next mux.
When entering the number for the BBC B (HD) mux make sure you take note that
the TV is receiving a signal from that particular mux.
There should be two meters, Signal Strength and Signal Quality.
If Signal Strength is shown at 100%, this can over saturate the tuner leading to a loss of signal
funnily enough, better if the Signal Strength is at 95% to 85% for example.
To lower the signal strength an attenuator may be needed (cheap and easy to use)
or if the signal needs to be boosted an amplifier may be needed.
Signal Quality should always ideally be 100%.
Are you using an exterior rooftop aerial, is it very old, could it have been affected by weather over the years
and shifted from its first installation position and no longer ideally set for your transmitter.
Aerial recommendations for todays Freeview broadcasts are Wideband aerials.
If you can't improve things by manually tuning your TV to your nearest transmitter
it may be time to get a professional aerial installer in.
Do not do a Rod Hull and Emu.
