I inherited a Sony HT-DDW740 that gives me a very bad audio hum when I select the AM or FM inputs. The CD input and others sound clean. I am wondering what the power supply situation is that feeds the tuner(s) and if there are any known problems with capacitors, voltage regulators on this model.
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This is probably a 60 cycle hum and the problem is more likely confined to the am/fm board, there is a bad ground due to poor solder joints, broken ground wire, an open capacitor, this may not be easy to find, but it is a start.
Please make sure that the connections are secure and proper.
Make sure that the sound is not muted.
Make sure that you've selected the proper input by INPUT MODE button.
Remove and reconnect the source.
connect a different device and check
check whether you're getting sound when listening to radio.
Tuner is only analog. As for the Video 1 input you need to go into the menu and change it to the digital port you want to use (optical, coaxial or HDMI) you can set only one input to each digital input port.
If memory serves correct, the VSX-3000 is from the late 80's. They are good receivers from that era. From your description, it appears the tuner module could have issues, since only the AM/FM has a hum. If all other inputs sound well, it points the the tuner module. These modules are not easy to repair (PCB with SMD highly tuned parts), and are easiest and cheapest to replace. Many VSX models of that vintage use the same part. Not sure how easy it would be to find one. They are a small PCB enclosed mostly in a silver shielding, with one or two connectors from the inside and screwed to the back of the receiver, where the antena connection is.
What I think is the problem here is that your A/V receiver may have a blown preamp for the turntable input. Or, although less likely, assuming that both channels sound normal when the receiver is set to a different input such as an FM tuner, there could be an impedance mis-match between the turntable's output and the reciever's input. But, the goal is to try simpler (and much more inexpensive), methods first. Try replacing the cable that connects your turntable to the receiver. If no difference is heard, then we should take another diagnoses.
I had the same problem, but it is not the tuner module! An
exchange of capacitor C899(100μF/35V) on the standby board has resolved
the problem. Under a dollar from an electrical store and you are all
sorted. 10 minute fix for those with a soldering iron.
You are using a new HD Cable box, that are using componet video cables for HD, Unfortunetly this receiver does not have componet inputs, so you will just have to run the audio from the televison directly to the receiver by connecting the video out and audio out from the television to the receiver's video Input one. This will require a normal RCA composite cables yellow,red,white. Connect one end of each of the cables to televisions output terminals, and the other to the input one on the receiver. Note: Your TV might have a seperate term called Monitor out, Connect the yellow here, and the red and white to audio out. You can do the same for the DVD but you have to use the same cables,Also the television will not display HD picture this way as this is not a HDTV Receiver. If you just want TV sound to the receiver then do not use the video(Yellow) cable just use the audio out terminals from the tv and connect to Input one on the receiver. you can do this with the cable box also but you have to use RCA type cables . If you want the full HD experience then a new up todate receiver is necessary.