Question about Denon DHT500SD System

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Known issue ?

Hi Terribly sorry to trouble you, but my machine has just passed 2 years old (do these things have a timer against the warranty !!!) and has started to go wrong Randomly, the LCD front display comes up with PROTECT and the system shuts down Can not happend for 8 hours, then will do it 5 times in 2 minutes Anyone else seen this problem before ? Is there a simple fix ? I really dont want to have to take it in for repairs, I havent got any speakers on my tv and i route everything through the Denon. If I take it in somewhere I wont have any sound on my TV !! Many thanks in advance

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Re: Known issue ?

My best guess from what you have said is that you may have some speaker wiring shorting (or bad speaker) or else you have a bad output transistor or a poor solder connection in the output amp area. If it isn't the wiring/speaker problem but the other then you will most likely need to see a repair guy to get it fixed. Hope this helps.

Posted on Mar 13, 2007

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1 Answer

Switch Noise

Try moving the unit away from power sources, for examples power adapters etc. The noise it is probably because of a faulty transistor or IC in the AMP section of the device.
To fix this you need to take unit apart and test components on the Amp area of the board, as this happens with all devices it is the final amp section having troubles.
Strange thing that device restart normally after this.

Aug 31, 2008 | Home Theater Systems

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Hi i have a pioneer dv424 system and something went wrong with it the timer indicator flashes only but the system does not work or function at all help please thanks

As to the timer function, maybe I don't recall any of these units ever having such a feature, however, that would out be the source of your issue anyway. Here's a couple of things to try first. Please check all your speaker wires, to be sure that there are no strands of fine wire touching the positive and negative terminals. If that is OK, open your manual, about 2/3 of the way to the back, and you will find a procedure called, "Return to factory defaults......or just Reset". You can try that procedure, but if that still doesn't remedy your problem, your unit probably has a condition known as DC Offset(meaning a damaged amp). If you need further information, or would like to inquire about a repair, please visit me website at You may contact me there. Thank you.

Dec 02, 2014 | Pioneer Xv-dv55 5.1 Home Cinema System

1 Answer

Static coming from the front right speaker. Sound now fades in and out, unit is only 2 years old.

I had this same issue about a year after I bought the product. Sent it back under warranty and about a year later, I have the exact same issue again. Never buying samsung receivers again.

Oct 11, 2010 | Samsung HT-AS720ST Theater System

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It wont play dvds!!! Panasonic SC-HT520

It's possible that one of the fuses have blown on the inside. Sony DVD players are known for this (Models DVP 330, 360, 560) and there are many complaints about it. They give the "No Disc" or "C-13" error. I ended up searching the internet and found people that had the same issue. I found the fuse and went to the store to find I had to buy 5 fuses because they were not sold separately. I ended up just soldering the connection knowing that it may break again any time. It works now and has been working for 4+ years since it broke. I'm not a very technical when it comes to electronics. I was just mad that my DVD player broke after the warranty expired. I originally paid $400US for the Sony DVD player. Now I can buy Sony DVD players for under $100US.

Here's a couple of things to check:

Dec 29, 2008 | Panasonic Home Theater System System

1 Answer

Bose 3 2 1


Sorry to hear that you are having trouble with your Bose system. Since it is turning off real quick it sounds like there may be a short in the system. The thing to remember about most modern electronics is they do not have a physical on/off switch. The power is controlled a circuit. Connect the circuit to turn on the device and connect it again to turn off the device.

So the short can be causing a ION charge on the board and after a certain point the charge gets strong enough to connect the circuit which turns off the device.

Now if you are lucky the issue is with the fuse not connected properly and it is just arching in the cradle because it is not connected properly which is causing the arching across the connector. I had a TV that had that problem once.

So what I would do is contact Bose to make sure that you can not get warranty service before opening the unit. If you can not then I would check the fuse and make sure it is connected good.

Hope this helps.

If you have any more problems and/or questions let me know.


Sep 10, 2008 | Home Theater Systems

1 Answer

Presets stopped working

I have repaired a few of these receivers in the past few years and have found several with microprocessor issues and some with a lot of heat stressed solder connections on the main amplifiers board around the voltage regulators.

The problem you are having is similar to problems the others I have repaired were having.

There is nothing you can, as an end user, do beyond a hard reset of the microprocessor by unplugging the unit from the wall and wait about an hour or 2 before you plug it back in.

By resetting the microprocessor you can at least see if the problem is a minor one or not. most likely it is an electronic problem that will take some good troubleshooting skills.

The bigger problem you face with this particular unit is that RCA no longer supplies parts for the audio equipment they sell.

Once the supply of what they have in stock is gone, thats it, no more parts at all for RCA audio. That supply has not been replenished in around a year.

All of the RCA audio equipment sold now is exchange only if it is under warranty.

I know this because I work at an authorized RCA repair center and I am the audio tech. I have not repaired an RCA audio unit under warranty in about a year because of that.

I have fixed 3 or 4 of the same unit you have, but not under warranty.

If you or somebody you know has very good soldering skills you can try reflowing the solder connections on the main board and even reflowing the microprocessor. It could solve your problem, but not advisable unless you are very good with a soldering iron and have done this sort of thing before.

I am sorry for this rather bad news, but it is true. I have been repairing audio equipment for over 17 years and am very familiar with RCA products.

If I can be of any further help please let me know.

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Please check if this is the model of your 3213e209c6.jpg

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You need a 2 Amp Slow Blow fuse. 250V. Available from eBay

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Looks like it will have to come apart. Can you see how? Usually the top/side casing is simply 5/6 screws 2 each side and 1/2 at the back then slide back away from the from panel. Technical help at Panasonic may be helpful.

Jul 02, 2007 | Panasonic SC-HT680 System

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