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If the main channel input is not giving you a picture, you need the tuner checked out or replaced. a good indicator is when you select a channel with the remote you will get just snow(sometimes followed by static in the audio)you do get the picture in picture thru the auxiliary inputs on the tv because they go directly into the audio and video drivers and bypass the RF circuitry. One way of making sure that the tuner is the problem is by hooking up the coaxial out of a vcr or dvd player to the main in or cable in of the tv and selecting channel 3 on the tv and then try a tape or a disc, if you get a picture then suspect something crossed in your installation between pip and main in of your tv set.please your feedback if i answered your question.thanks!
perfect focus functions are based on service mode setup...or factory settings. if the alignment of these setting are loss then the unit wont perfect focus. does the unit have a complete loss of convergence. a complete loss of convergence indicate possible failure of convergence amps.