How to inject a signal into a TV?

[Jon1967us]

Originally Posted by old_tv_nut

Those little (few pf ) caps don't get leaky, but could open (though not likely). More likely failures are the coils L10, L11, L12. Check L12 resistance to see if it is open. Should read 9.5 ohms, but if open, will read the 10k parallel resistor.

Edit: hope we are both reading the same schematic (rca_ctc16x_sams-0818-2.pdf).

Yep, Sams 818.
Measuring 25k across coupler C23. Need to lift a leg and get a real measurement on that little cap. The coils you mentioned are underneath the board. Hopefully they're not bad, as only a parts chassis could supply a replacement. L12 is after my injection point that didn't show smearing. So, yeah, L10, 11, C23 or a drifted R60...