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Since most projectors don't have built in tunning ( they only have audio/video input jacks), you'll have to use another source for tunning - one that has a/v output with built in tunning. The best source would be a vcr or dvd recorder with a built in tuner.
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If this is the first time this is being set up, On the setting of the Samsung, you have the option on the channel for the channel schemes. See if it conforms to your area. It identifies which frequency for each channel. Try the different settings. If this has worked before check the connections or ports and try a another TV if see if it works. If this is via cable, if there is a box between the TV and the cable wire, have it checked if another TV worked on it.
First for the Toshiba could the SAP (Second Audio Progam) be turned on this will somtimes cause the audio to drop. And are you using the onboard tuner or does this set conect to a cable box?
Then for the Panasonic the most common problem for your fault would be the convergance curcuits are shorted and need replacment, or some other componet may be loading down the set and forcing it in to shut down, Tv's will do this to prevent further damage
Which channels? Tuners are divided into bandwidths----- 2-6 is V low, 7-13 is V high and so on.If say, 2-6 acts up, but 7 thru 13 never does,then the tuner is bad. This solution assumes that video inputs were ok......T.
You have already diagnosed the tuner as the problem,the first thing to check is the conections at the tuner specially the ground conections,the shell of the tuner is the ground and it conects to the chassis by being solder to it,if all conections check ok look for overheated areas.After that is taken care you still have the possibility of having a bad tuner.If you are familiar with tv service this information will help but if you are not too familiar be safe and call for assistance from a servicer.