Hello, I’m Nathan, and I’ll be assisting you today. My livelihood depends on your positive feedback, so your satisfaction is my highest priority.
Hi there, sorry to hear your'e having trouble,
there are a few possible causes of this issue,
It may just be a firmware glitch (which we can try to reset),
or it may be a hardware problem (bad main board, not processing hdmi inputs properly)
The one thing you can try yourself here is a factory reset of the set
that is done by going into the service menu
note that this menu is not intended for consumer use, it is for technicians, so you must be very careful not to alter any settings or you could permanently damage the tv.
Press the MENU button on the remote, then type 4725
this brings up the service menu
go to Options,
then look for the Factory Reset option and execute that
If the problem still persists after this, you could try an alternate connection instead of hdmi (like component/composite),
and failing that, you'd be looking at repairs that quite frankly would not be practical, as you'd spend more to fix this set than it is worth for a model of this age - you could buy a new tv for less.
That isn't a programming function,
though it is supposed to return to the last source used by default,
since that isn't happening, that is why I was suspecting a hardware problem as well as because of the sound issue
did the reset help with the sound?
Okay, that would tend to confirm a hardware issue as well then.
So at this point you can fall back to the analog connections as an alternative, to see if they work any better
otherwise, you'd be looking at repair/replacement
You're welcome, and I'm sorry there isn't a better answer here. Though at over 8 years old, this set has had a pretty good run.
If you would like some help though with finding parts, finding a local shop, or replacement model recommendations, just let me know.