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Message: <blockquote data-quote="pgh13" data-source="post: 616063" data-attributes="member: 191774">Just a few thoughts......You could take a trip down to the reference library.....you may find collections of circuits there. Even if you can't find the exact model if you study a few you may spot trends which enable you to recognise where you'd need to input your signal to do what you want. The audio is probably easier to recognise but as sets have developed more is being done by fewer components so that may not be the case any longer.  You may want to check out VCRs because they often had multiple inputs before it was common in TV and also they have nice low voltages to work with. Also, you need to remember that TV circuitry can be very cheap and nasty and live chassis used to be common practice - maybe less of a problem with portables</blockquote>