Hi. I may need to study something on PLL, etc, but for now let me describe the fault. My TU-911 (FM only) tuner outputs noise. The display reads 87.5 Mhz and I cannot alter that. There is a button which has positions "seek/muting" & "manual". The tuning knob physically only turns a few degrees left or right. There are some memory buttons. Question: What can be inferred from the fact that the LCD is displaying a frequency, in this case 87.5 Mhz (apart from the fact that the LCD display is working)? I mean, is the PLL working? The tuner is described as "Digital Synthesized Quartz-Locked". I have the service manual. Could it be a typical fault? Thank you. Rich EDIT: The PLL synthesizer is TC9147BP.