Hello Chris, Thank you for that information- I have now been able to store the changes! Now all I have to do is hope that all of the epoxy glue I have had to use on the plastic framework holding the PCB's holds as I put the case back on! I assume that the heat over the years had made the plastic very brittle- lots of breaks as I moved the boards

Hello All, I have just obtained and repaired an L4500 TV. However, I cannot work out how to store changes to the AV settings. I can get to the menu giving a block diagram of what is on AV1 and AV2 - and can change them, but cannot store the changes. Which remote control buttons need pressing to store the changes?? Thank you.