FT109RH - keypad controlled 220mhz unit. Not much on market for this band anymore. For a decade this one has had a problem where it would sometimes power up with noise from speaker like squelch is open, but would not quiet with squelch knob adjustment. Turning it off then on would fix the problem. Now this "fix" no longer works. Other functions appear to work, although I don't see any output on TX even though battery drain and meter indications are consistent with output and also changes consistently with with power setting changes.
I too have a FT-109RH with a similar problem. I do have TX output but the radio will not quiet even with the squelch turned all the way up. I am suspecting an electrolytic capacitor is gone as it would often recover functionality after operating a while. I do have RX as well though it appears to be slightly reduced in sensitivity.
The only service manual I have is for the 2m FT-209R which is similar. I hate to scrap the radio since, despite its age, it is still a good solid 5W 222MHz radio. It is definitely more ham serviceable than modern SMT radios.