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Hi , I`m Jack Perhaps I can help you with this problem but first could you please send me a reply when you see this ?
I`m sure i can but first a few questions to understand the problem clearly
Now you are saying the front panel buttons are not active or that the DEVICE button does change the input but nothing shows up ?
In other words , something happen when you press that button , is that correct ?
O.k then and I take it that you don`t have the TV's own remote ?
Right now it looks like the front panel may be locked out .
Try this , press and hold for 10 secs the DEVICE button and then try the buttons again
Its either that or press and hold the MENU button , this changes with the models
try the menu then
I just checked and it is indeed the MENU button that will unlock those controls and if you want a full reset (passwords and all) then press and hold the POWER button 10 secs and this will return the tv to factory settings.
If that answers your question please do not forget to rate by clicking on the 5-star icon at the top, then click on Submit so i get paid for my time helping you .Also note that it will not close this post , you can come back here at any time if you have questions. Thank you
You can see the lock function on page 76 of the manual you will get at the link below;
Its called "front button lock"
Much welcome and please do not forget to rate so i can get compensated for my time helping you.