Sound works for TV but not for DVD - AVS Forum
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Old 05-03-2007, 12:48 PM - Thread Starter
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I have a Panasonic DVD/VCR Home Theater Sound System HT800V. Recently, the sound stopped working shortly after starting a DVD playing (within 1-10 minutes). It still works always when watching TV. I had a consumer electronics tech out to look at it, and he said it was wired correctly and that the unit must be broken. So, I ordered a replacement unit (refurbished). I changed out the DVD/CD player and still had the problem. So I changed the woofer, the speakers and all the wires and still have the problem. Any clue what is going on cause I'm frankly stuck on what the next step should be.
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Old 05-03-2007, 05:08 PM
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Quote:
Originally Posted by deckerspence View Post

...So, I ordered a replacement unit (refurbished). I changed out the DVD/CD player and still had the problem. So I changed the woofer, the speakers and all the wires and still have the problem. Any clue what is going on cause I'm frankly stuck on what the next step should be.

Are you awaiting a replacement or do you have the same problem with the replacement? If you are still waiting then come back if the problem persists but with some more information.

If the HT800V audio worked with one source and not another then it wasn't the speakers.

The only HT800V for which I can find a manual (at the Amazon site--nothing at Panasonic USA) seems to have an integrated DVD so it is unclear which unit you have and just what is connected and how. Perhaps you can post a link to an online manual, and tell us what make and model device is connected to what and which inputs and outputs are used?

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Old 05-04-2007, 06:57 AM - Thread Starter
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I already received the replacment and changed the player itself, then the woofer, speakers and wires/cables. Same problem persists. The manual at Amazon is the one that I have but I don't know how to post a link to it. If you go to Amazon and search SC-HT800V - this brings up the manual for my product. Unfortunately, most of what the manual says is in a language that I don't speak (i.e. technical). I just can't figure out what else it could possibly be that is causing the problem. I read through the manual several times trying to see if there is a setting on the remote or the unit itself that might cause this odd occurence, and just can't find anything. I do appreciate your help.

I don't know how to post a description of what is connected to what else. I can tell you that I hired a consumer electronics person to come to my house and confirm that everything was wired correctly. My son-in-law was here last weekend and also confirmed that the wires go where they should (he's an electrician so somewhat knowledgable).

Bottom line: Have replaced the DVD player, the speakers, the woofer and the cables and still lose sound when we start to play a DVD but have no problem playing a TV program. Any clue what might cause such an odd thing? The folks I've had here say it is not possible that this is happening - but I assure you that it is.
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Old 05-04-2007, 04:32 PM
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Could it be that the main unit is in another mode different than dvd or vcr like"Aux"
or something to that nature ,
or maybe the unit is in mute mode or the remote might be defective...
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Old 05-04-2007, 07:28 PM
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Do you lose sound 1 - 10mins into the actual movie or is it that you have sound during all the menus etc but the sound goes when you start to play the actual movie itself?
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Old 05-04-2007, 09:51 PM
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deckerspence is my mom - I'd just like to clarify somethings for you guys.

The current setup has our cable coming in through a cable box.

The cable is outputted to the DVD/VCR unit through coaxial cable. Also on the out is a AV(Red, White, Yellow) cable that goes to my DVR dock for my Archos 504.

Hooked up to the DVR is another AV cable that goes to the DVD/VCR unit.

From the DVD/VCR we have an AV output that goes to the TV monitor(Plasma, no monitors, so only video is hooked up) and a proprietary(I think) cable that goes to the woofer. The woofer also provides outputs via copper +/- wires(sorry if using wrong terminology) to each of the 5 surround sound speakers. These are the only cables we have ran.

Usage of the DVD/VCR unit - buttons allow you to swap the output from DVD to VCR. The DVD can run DVDs(cuts out after an varied period of time) or CDs(have not tested for usage). The VCR controls the cable(works fine for hours and hours), VHS(have not tested for usage), and my DVR(On AUX setting, works for full films played through my Archos 504).

The ONLY thing that changes when watching a DVD is the DVD vs. VCR setting on the unit.

lou - Remote is not defective, or I don't think so at least - have tried playing DVD from unit - just hit play on unit, not remote. Unless the muting is going on randomly, on it's own, it's not muting, but more of a sound canceling.

tiltman - I have sound during the menus, but I haven't tried it that long on just the menu. So, I hit play, and in under 10 minutes the sound "cancels".

Also, on another note, I have not tested this, but it seems like the longer the unit is off, the longer the sound will stay on(Although I had it off for over two days, it still went off inside 10 minutes.). I am not 100% sure on this though.


The only parts I have changed out are the DVD/VCR unit, the proprietary cable that goes to the woofer, and the woofer. I am using the original speakers and copper cabling.


When I have a chance tomorrow I will test; CDs and VHSs. My prediction is that the VHSs will work and the CDs will not since the tapes will be on the VCR side, and the CDs will be on the DVD side.

Sorry for such a long post.
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Old 05-05-2007, 01:06 PM
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When a receiver or HT system plays normally for a short period and then becomes silent the usual cause is a protection circuit that trips because the unit is overheating or because the current draw is above a safe level. This can be the result of poor ventilation, a short in a speaker connection or playing at high volume levels.

If TV audio plays normally and you are playing DVDs at the same level we can rule out overheating, speaker shorts and excessive current draw.

Sometimes internal components and connections fail after a short period of use raises the temperature a bit. That might explain the first unit's problem. But to have the identical problem with a second unit takes us into speculating that there might be a flaw in that model, and that when the refurbished unit was checked it was not heat run (left playing long enough for the problem to show itself).

You will not learn anything useful from playing a music CD, except that CDs play and DVDs do not.

Your unit appears to be several years old. If you bought it recently you should return it and buy something else.

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Old 05-05-2007, 02:25 PM
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No, we will have to buy a new unit, but we had DVDs playing fine for years in the original model, so that makes it increasingly interesting. A friend recommended that I disconnect everything but the DVD player's AV connection to the TV and the speaker connection and try it. Any merit in trying this?
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Old 05-05-2007, 03:07 PM
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Quote:
Originally Posted by Aequitas View Post

No, we will have to buy a new unit, but we had DVDs playing fine for years in the original model, so that makes it increasingly interesting. A friend recommended that I disconnect everything but the DVD player's AV connection to the TV and the speaker connection and try it. Any merit in trying this?

I started to make that suggestion, but couldn't see what you would learn. The fact that it takes ten minutes for the DVD player audio to stop and that it works longer after a longer rest really does suggest a heat related problem. But that could be a solder joint that opens, a capacitor that faults, a resistor that opens, etc., etc.

It is hard to picture a situation in which a connected input source device that is not selected could have any impact on the selected source. However, you might try starting a DVD playing and then disconnecting everything, including the video connection to the display, except the speakers. You have already ruled out the all of the speakers because they work with other sources, so if you still have the problem it is with the DVD player and associated circuits. But what then?

If you do the experiment and the DVD audio continues to work, then try reconnecting each device one at a time until it fails. Report that back here. Better informed minds than mine may be able to help.

The fact that an opinion has been widely held is no evidence whatever that it is not utterly absurd.
-Bertrand Russell
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