Question about Sony HT-DDW740 System

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Tuner Hum on Sony HT-DDW740

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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  • groucho99200 Dec 08, 2008

    Your diagnosis was right on the money. It took a bit of time to get to it, but when I did within 30 minutes it was working as it should without the constant tuner hum. My thanks and compliments..

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Check electrolytic capacitor C899 100uF 35V in STBY PCB
Cheers

Posted on Dec 02, 2008

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Bose av18


Hum is tough. It is often caused by quite a variety of things. First, address the basics:
1. Make sure that none of your signal cables run near to power cabels.
2. If possible, feed all power from the same receptacle.
3. If your plugs are not polarized, try reversing one at a time.

If none of those basic checks uncovers your demon, verify the path of the noise by disconnecting the signal from the preamp at the input to the sub. If is still hums, then look closely at the power feed to the sub, More likely, the hum will stop (along with the music.) In this case, try breaking the shield ground at the sub input (e.g. with a ground isolation adapter.)

You should also confirm that the hum is limited to the sub. Subs tend to exaggerate hum because playing signals in the 60Hz is their forte. So with the sub turned off and bypassed, listen for the hum in your main speakers. If it is there, too, then start checking your sources. Remember, even a source device other than the one selected for play could be the source ... completely disconnect each source at the preamp to track it down.

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No audio come out in speakers.


change the input. Amp could be blown. the speakers should have some type of hum when volume is turned up.

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Need sony home theater manuel model HT-DDW740


http://esupport.sony.com/US/perl/model-documents.pl?mdl=HTDDW740

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Can I connect a Sony DVD Player DVP-SR90 to the Panasonic Home Theatre SC-HT75 to achieve surround sound without direct SCART connection - and how?


You can connect your Sony DVD player to your Panasonic HT using an analog RCA audio cable (white and red) for stereo sound. Connect to the AUX inputs on the HT and select AUX. Since the Sony DVD player only has SCART, you would need an adapter, scart to RCA. Like this one:
http://www.maplin.co.uk/scart-to-3-phono-plugs-with-in-out-switch-28102

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Check for compatibility. Use the red and black RCA plugs for the audio into the HT.

Your Panasonic HT does not have a digital audio input which would be required for multi-channel surround sound (Dolby Digital 5.1)

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I have Sony FM Stereo, FM-AM REceiver HT-DDW740. I have connected them per the diagram but I cannot get any sound. I get a message SPK OFF on the screen. Is there someting that protects and trips all...


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.

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Connecting PC to the Philips HTS3455


Hum first,,, anytime you have 2 devices with sound running to a cable or ant equipted TV you will get a hum as they are grounded off curcuit. HumEliminator (radio shack). You didn't tell us if your PC had been enabled in control panel for either device. I have had no luck using the rear aduio output on any computer. Front headphone jack on PC does not need enabled and will work better for this. Unless you use a USC codet interface which is better yet for CD quality in sound. Also make sure the Aux inout is enabled on TV as well. Direct Input would be the same. Lastly,,you are 100% positive the backside is input and not actually out put or gaming inputs.

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Hello,
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.
Good luck

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How to connect new HD cable box to receiver


HI:
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.

Dec 06, 2008 | Sony HT-DDW740 System

1 Answer

Sony HT-DDW740 Tuner Hum


Hi:
On the stanby power supply replace or have replaced C899 with a 100uf 35V capacitor, this capacitor goes bad and produces hum in the supply voltage to the AM FM circuits.

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2 Answers

No sound coming from speakers


check the speaker connections for any short circuit and also for polarity.
check if mute is highlighted on the screen
check if the audio output of the player is properly connected (optical / coax or RCA
this should solve your problem
If not tell me your connection configuration with regard to input output.

Regards David

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