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Look at ebay and amazon for "parts" tvs for each product find the 3 lowest and the 3 highest and average them. that will be you average asking price on them, if you cannot find them figure about a quater of the cost to buy it used in working condition.
If you are using a cable box or other device upstream, look into it's volume. Typically source units would like to be 30 to to% volume, with the tv or stereo being the final control. What happens is the source volume gets turned too low, and then the final unit (tv or stereo) has to have so much volume to hear anything, distortion and poor sound result. Start with both midway and you should be good to go. This presumes that you toggled any buttons that said mute or attenuate...
I think I had the same problem. This is how I fixed it.
I have my vizio 42 hooked up to a Harmon Kardon surround sound, and the digital cable box. Essentially, I can adjust the volume 3 ways - through the tv, cable box or av receiver. The humming sound happens when you have the volume maxed out on the av receiver and not the cable box.
For example, the sound level on my Harmon Kardon goes from -10 (lowest) to 10 (loudest), with 0 being the middle ground. The buzzing was happening when the Harmon Kardon was set to 10, and I was using the cable box volume to adjust the sound. To fix it, I turned down the volume on my receiver to 0, which may be about 50% max volume of the receiver. Then, I switched devices and used the volume on my cable box. This got rid of the static I was getting. Hope that helps.
Excavated with Google from Philips website:
When a letter F appears on the right hand corner of the screen it means the television is in factory mode.
To exit from factory mode, press the 'VOLUME -' and ?CHANNEL -? buttons on the TV set simultaneous for 5 seconds.
Hope this helps