Post by serafis on Aug 19, 2023 0:34:15 GMT -5
New project - a Yamaha RX-V473. On all inputs, all channels, there is a static-y white noise (a bit like the test tones, but quieter) with distorted audio, except on analogue inputs in direct mode, when it sounds fine. Digital inputs in direct mode still have the static noise and distorted audio. When no input signal, analogue inputs just have the static noise; digital inputs and tuner are silent. I've done factory reset, firmware update and basic checking of power supplies and regulator voltages, all OK.
I think that analog signals go through ADC to DSP to DAC then to audio amplifier, except in Direct mode where they bypass these; digital signals go to DSP to DAC then to audio amplifier. So I'm thinking the problem is likely to be in the DSP or DAC chip, but not sure how to test or check this. The DSP functions (e.g. sound fields) do appear to work, but with the static and distortion on all active speaker channels.
Service manual is at elektrotanya.com/yamaha_rx-v473_htr-4065_sm.pdf/download.html.
Any help greatly appreciated.
TIA, Jon.
I think that analog signals go through ADC to DSP to DAC then to audio amplifier, except in Direct mode where they bypass these; digital signals go to DSP to DAC then to audio amplifier. So I'm thinking the problem is likely to be in the DSP or DAC chip, but not sure how to test or check this. The DSP functions (e.g. sound fields) do appear to work, but with the static and distortion on all active speaker channels.
Service manual is at elektrotanya.com/yamaha_rx-v473_htr-4065_sm.pdf/download.html.
Any help greatly appreciated.
TIA, Jon.
