I wasn't sure if you could see anything, which is why I was asking, to further isolate the issue.
Unfortunately, the issues you are experiencing are symptomatic of an internal hardware defect, most likely a bad sustain board, though there are many possible failure points. This issue could be a manufacturing defect, but is also often caused by a power event (shock/surge, prolonged over/under voltage condition, etc).
This could also be the result of age related wear and tear, as a 2006 model tv, that type of failure wouldn’t be surprising, as this tv is already past its expected service life.
There is one step you can take here, both as a possible fix, as well as a diagnostic evaluation
1) Unplug the power cord from the tv
2) Wait at least 1 hour (60+ Minutes)
3) Press and hold the power button (on the set, not the remote) for 60 seconds
4) Keep holding power button while plugging back in, and for another 60 seconds after. When plugging back in, go directly to the wall outlet, bypassing any power strips or surge protectors.
If this reset process does not work, it would unfortunately confirm an internal hardware failure.
This is something that would require repairs to correct; if you're thinking about a do it yourself repair, you'll need to be comfortable and skilled with electronics repairs, which would require dismantling the set (removing the back panel of the tv), diagnostics with a digital multimeter to test voltages inside, changing out boards as needed, and possibly desoldering/removing and soldering/replacing capacitors (a common failure point). To give you an idea a new ymain board is about a $150 part, when they can be found (usually only used)
If you’re considering repair at a local shop, you’ll find a typical repair to be around $300 for diagnostics, parts, and labor, though parts are nearly impossible to find at this point.
Replacement will usually make more sense though for a tv of this age - you can get a brand new LED tv with a fresh warranty and better picture (1080p) in the $600 range these days.
Depending how you’d like to proceed here, I can help with finding parts, finding a repair shop, or recommending replacement options. Just let me know.
Best regards, ***** ***** for the news,