Quote:
Originally Posted by Electronic M
The diode rectifies the AM carrier to make video and passes the FM carrier for sound....if the diode shorts it won't make video for the video amp but the sound will still flow down the chain normally....heck if the diode opens and passes just enough signal through capacitive coupling to the video amp you could still get sound.... video detector fails are fun.
If you.can inject and watch video on the vid amp side of the diode then you know the diode failed.
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Should be easy to test the diode under normal conditions, except that it's near impossible to get to. I can't really get behind the board to unsolder the can. Really thinking of a brute force way of getting to it, IE a Dremel or something
Would like to avoid spending upwards of 4+ hours unsoldering everything needed to free this board and then resoldering everything...but given the long weekend I just may have to bit the bullet.
I have plenty of germanium diodes on hand.
By injecting the video signal, could I plausibly take the yellow video out from the D to A converter output? would that be the right method? I've never done it before.
I'm aware of the Tube socket adapters. The problem here is that there is a metal cover, so one would need to pry that off to fit an adapter in.