Hi there
Have you tried a MAINTENANCE RESET?
MAINTENANCE RESET as follows :
Turn box off with button at back then unplug power lead for a couple of minutes.
Re plug in power .
1. Ensure the YouView Box is switched off and is currently connected to the router (the YouView Box will require an internet connection).
2. Power on YouView using button at the back of the YouView Box.
3. Start YouView using the power button on the YouView Box front panel, and then quickly press and hold both the + and – buttons on the front panel. If you haven’t pressed the buttons together by the time 'YouView Waking Up' is displayed, or you see the 'YouView please wait...' message then try again.
4. Let go of the + and – buttons once the 'Huawei – Maintenance Mode menu' is displayed.
5. The + and – buttons on the front panel will navigate the menu. Keep pressing the – button until 'Internet/USB Recovery, keep recordings' option is highlighted. If you go past the option, simply press the + button to navigate back to the option.
6. Press the power button on the YouView Box front panel to select the option. This will bring up some information and ask 'Do you want to proceed?'. Press the power button again to confirm.
7. The YouView Box will now show a progress bar as it downloads software from the internet and installs on the YouView Box. This may take several minutes. Once complete, the YouView Box will restart.
8. Once the YouView Box restarts, the YouView Box will show the initial setup wizard. You will need to run through the setup wizard including tuning the channels.
IT IS ALSO WORTH ENTERING YOUR POSTCODE AS IT WILL HELP FINDING BEST TRANSMITTER FOR YOUR LOCATION !!!
You will lose scheduled recordings so you will have to re apply these !!
If you are then running the aerial lead from the TT box output into the TV then as said you will need to also enable the passthrough option on the box.
Personally I use a powered splitter with one lead to each, so that if TT box goes wrong I still have the freeview channels available on TV.