My Samsung TXN2771HF has started flashing "Not available" all the time, and the remote does not control the TV. When the menu or channel buttons on the TV used, the TV continuously and autonomously scans through the menu options or channels, respectively, without stopping.
I have the same TV and had the same problem. It's due to a failure in the front-panel buttons, which are very sensitive. Mine got so sensitive that they were registering presses all the time, even when nothing was near them.
Since I never used the front-panel buttons, I solved the problem by opening up the TV and disconnecting the front panel from the rest of the TV electronics. This was somewhat difficult to accomplish due to the fair bit of TV disassembly I had to do to get to that connector. After I put the TV back together, the "NOT AVAILABLE" problem was solved, but somehow I had damaged something else--the tuner, composite, and S-Video inputs lost their color and now only show up black-and-white. (Luckily, I only use the component video inputs, which were unaffected.)
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Ther are two focus adjustments on the HV transformer to try.......a technician will center them both then tweek them either way for best over all focus.........your crt(picture tube is probably aging or focus anodes out of range....but we need to try this first
Sounds like the 5 volt supply is low, Look for the 5 volt regulator, Measure you can go directly to the sensor 3 pins 1 will be 0 volts one will have 5 volts the other is usually a fluctuating 3-5 volts if 1 pin has to have 5 volts if it is low check capacitors around the 5 volt regulator probably 47uf to 100uf look for rusty look on the leads. If you see it change it! check these voltages with set turned off ( standby ) do not attempt if you dont know what your doing. Good luck. The reason it works when it is on is because there is a run 5 volt supplement.
My Samsung TXN3271HF had the same issue where the poorly-designed Soft-Touch channel button begin to register phantom touches (leading to the "Not Available" message flashing on the screen).
The fix is simple: remove the plastic strip containing the Soft-Touch buttons and when replacing the strip, leave some room between the buttons and the TV's circuit board (you will see the circuit board once you remove the plastic strip).
The most common problem this set has is the Horizontal Output shorting, usually caused by the High Voltage transformer drawing to much current.
Whether it's the high voltage circuit or the power supply, having a tech look at this set would not be cost effective.
Start looking at the newer technology.
Hope this helped.