My Kenwood TS-120S just developed an issue that used to be intermittent. When I turn it on, the display shows only two dots on the display, with no receive or transmit. In the service manual, the troubleshooting page says "PLL Unlock" as a likely problem for that issue. I've tried Googling more information on that with little success. Has anyone had the same problem in this or a similar model radio? What did you do to fix it, and what do you suggest? Thanks!