tem00 wrote:
It's a RX-V620 and only has this problem in the surround/DSP modes.
I'm a tech but not an audio tech.

Can someone please tell me any common failures for this symptom and
which circuit(s) to check? DSP IC, DAC, ???

Thanks
Thad

Could be the YSS chip, the DRAM, or a codec A/D chip either one. These kinds
of problems are some of the worst. Later model Yamaha's have built-in
diagnostics which can sometimes help isolate the problem, but not always. I
was fooled on one recently. Replaced the YSS chip as indicated, no fix.

My guess is the YSS chip, but the surest fix is to replace the DSP board,
which Yamaha probably does still have - but it's going to be expensive...

Mark Z.