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Resistance from pin 7 to ground with detector diode reveresed should be essentially R54 and R55 in parallel = 3327 ohms. This agrees with your measurement.
With the opposite polarity, it will depend on how much voltage your meter applies to the circuit to measure resistance, which will determine how much the video detector diode conducts. I suspect your meter has a lower voltage than the one SAMS used. So 2.1 k may be fine.
The DC voltage on pin 7 will depend on video content, and will be more negative with a dark scene, so -5 volts *may* be OK too. Have you checked L6?
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Last edited by old_tv_nut; 05-25-2021 at 02:58 PM.
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